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Event Distance(s) State / City
Oak Grove Montessori School Tortoise Run
Oak Grove Montessori School Tortoise Run: 5K, Mile Fun-Run, and Tot Trot April 18th, 2015 at 8AM Carrollton, GA
5 K
1 Mile
Georgia
Carrollton
Oakland Artscape 5k, 10k
Discover the amazing street art of downtown and uptown Oakland! In teams of 1 to 5, find your way to colorful alleys and beautifully painted buildings on foot. Answer simple questions at each checkpoi ...(continued)
10 K
5 K
California
Oakland
Oakland Running Festival
Inaugurual event. Marathon, half marathon, 4 Person Relay, 5K, Kids Fun Run.
Marathon
Half Marathon
5 K
California
Oakland
Oakland Streets n Ladders 5k, 10k
Wind your way through the picturesque neighborhoods of Crocker Highlands and Piedmont on a fun map adventure for teams of 1 to 5! Your custom-made map will reveal the secret paths and staircases to he ...(continued)
10 K
5 K
California
Oakland
Oakland Streets n Ladders III 5k, 10k
Teams of 1 to 5 explore cool neighborhoods to find remarkable checkpoints. 5k, 10k distance
5k
10k
California
Oakland


Oaklawn Hospital Hospitality Classic
Oaklawn Hospital Hospitality Classic 10KR/5KR, 5K non-competitive walk, 1Mile Fun Run in historic Marshall, MI.
10 K
5 K
1 Mile
Michigan
Marshall
Oaks Park Oktoberfest 5k Fun Run and Kids 1k
Oaks Park Oktoberfest 5k Fun Run & Kids 1k fun for the whole family. 1st annual fun run during the annual popular Oaks Amusement Park Oktoberfest Weekend
5 K
Oregon
Portland
OAT Run (Olympic Adventure Trail Run)
12K and half marathon trail run, followed by bbq and beer at Harbinger Winery.
Half Marathon
12 K
Washington
Port Angeles
OAT Run Half Marathon and 12K
This is the second year of this event, which sold out in its first year. The races are held on the recently constructed Olympic Adventure Trail (OAT) in Port Angeles, Washington. There is a 12K and ...(continued)
Half Marathon
12 K
Washington
Port Angeles
Oberod 5K Trail Run
Oberod 5K Trail Run Oct. 11 is a beautiful new run in the heart of the rolling Brandywine Hills during the heart of Fall Foliage season. Benefits Children & Families First. $25 includes race chip. Trail map at bitly.com/RunFest15
5 K
Delaware
400 Burnt Mill Road
OBX Marathon
Begin your journey in historic Kitty Hawk, home to the birth of aviation. Run with the ghosts of the Wright Brothers as you meander the Memorial Trail on the edge of the picturesque Albemarle Sound. T ...(continued)
Marathon
Marathon
Half Marathon
5 K
North Carolina
Outer Banks
OBX Ultramarathon
50k minimalist run along the beaches of North Carolina's Outer Banks.
50 K
North Carolina
Kill Devil Hills
OC Fair Fun Run 5K
The OC Fair Fun Run 5K takes placein conjunction with the OC Fair! Come for fun for the whole family with games, prizes and lots of fun!
5 K
California
Costa Mesa
OC Heart Run and Walk
The Orange County Heart Run & Walk is a new sanctioned 5k/10k run and 5k walk event, designed to celebrate those who have made lifestyle changes and encourage many more to take the pledge to live heal ...(continued)
10 K
5 K
California
Laguna Niguel
OC Heart Walk
The 34th annual OC Heart and Stroke Walk is a 5K walk designed to celebrate our mission of building healthier lives free of cardiovascular disease and stroke. Join us on Saturday, March 7, 2015 at the Angel Stadium of Anaheim. Registration is free, visit our website at www.ocheartwalk.org .
5 K
California
Anaheim
OC Walk to Remember
OC Walk to Remember is an annual walk that takes place to honor babies that have died due to pregnancy loss and infant death. Parents, and their loved ones and friends, are invited to come walk the steps our babies will never take.
2 Mile
California
Tustin
OC Walk to Remember 5K
OC Walk to Remember Remembrance Ceremony, 5K Walk, and Celebration of Angels Pregnancy & Infant Loss Support and Awareness The OC Walk to Remember takes place in Orange County, California, in Oct ...(continued)
5 K
California
Tustin
Ocala Marathon and Half Marathon Weekend
The Ocala Marathon runs through the renowned horse country of Marion County. The marathon is a combination of southern hospitality and a stunning course that you cannot find anywhere else in Florida. Athletes will come from around the world to test themselves and each other on this Boston Qualifier.
Marathon
Half Marathon
Florida
Ocala
Ocean Beach/John and Jessie Kelley 11.6 Mile Road Race
New England Runner Magazine, voted "Best of the Best Races" Race is ran in honor of marathon great John J Kelley and his wife Jessie.
11.6 Miles
Connecticut
New London
Ocean City Guts and Glory 5k Run Walk
Trade in your sandals for sneakers on August 17th to support the Crohn’s & Colitis Foundation. Proceeds from the run benefit research, education and support programs for patients and families coping w ...(continued)
5 K
New Jersey
Ocean City
Ocean City Half Marathon
The Ocean City, MD Half Marathon event also includes the 5 K race. Half Marathon course will remain with the start located at Ocean City Inlet parking lot, leading to the Awesome finish at Assateague Island State Park.
Half Marathon
5 K
Maryland
Ocean City
Ocean Drive Marathon
The Ocean Drive Marathon is run on a beautiful 26.2-Mile point-to-point course thru the scenic barrier islands of Cape May County, NJ.
Marathon
New Jersey
Cape May County
Ocean Road 10k
We are excited to announce the second annual Ocean Road 10k benefiting the Narragansett Historical Society. Scheduled for October 4, 2015, the course starts at the Point Judith Lighthouse and travels ...(continued)
10 K
Rhode Island
Narragansett
Ocean State Rhode Race
coolrunning.com
26.2 Miles
Half Marathon
5 K
Rhode Island
Narragansett
Oceans 50 Relay Race
A 50 mile running relay winding through scenic trails, along the ocean on A1A, over bridges….all with 5 of your best running buddies. Finish it off with a beachside celebration with food and drinks.
50 Miles
Florida
Palm Coast
Ocmulgee 5K Run/2.5K Walk
Ocmulgee National Monument is celebrating its 75th anniversary with a 5K Run/2.5K walk around the Great Temple Mound and Funeral Mound constructed by the Mississippians.
5 K
Georgia
Macon
ODDyssey Half Marathon
The ODDyssey was recognized as one of the top 100 road races in North America last year because of the race's dedication to the runners' experience!
Half Marathon
Pennsylvania
Philadelphia
Odyssey Adventure Race
Soloist and teams of 2,3,4 of any gender will mountain bike, trek, and paddle in the mountains of beautiful SW VA for 24hrs using only a map and compass to find their way. The views, challenges, and a ...(continued)
One Day Adventure Race
Sprint Adventure
Virginia
New Castle
Odyssey Blue Ridge Bear EPIC Adventure Race
The 25th Edition (wow!) of the Odyssey Blue Ridge Bear EPIC (formerly One Day) is a 24 hour EPIC Adventure Race designed with classic Odyssey elements --- tough nav, options, sweet single track, great water, and lots of UP and sometimes, a little down.
Adventure
Virginia
Roanoke
Odyssey Blue Ridge Bear FIX Adventure Race
Not quite ready for a 12 hour or 24 hour race, but definitely need a quick endorphin fix!? We've got you covered! The Odyssey Fix is the perfect race for those who want a taste of Adventure Raci ...(continued)
Adventure
Virginia
Roanoke
Odyssey Endorphin Fix 2 Day AR
Adventure
West Virginia
Hinton
Odyssey Endorphin Fix 3 Day Adventure Race
200 mile expedition race
Other
Other
West Virginia
Pipestem
Odyssey Fall Finale 24 hour and Sprint AR
Adventure
Virginia
Buchanan
Odyssey One Day Adventure Race and Odyssey Sprint AR
Adventure Race in Odyssey's backyard
Other
Virginia
Roanoke
Odyssey One Day and Sprint AR
Adventure
Virginia
New Castle
Odyssey One Day Extreme and Xtreme Sprint AR
The Odyssey One Day Xtreme will have unsupported teams of 2, 3 and 4 will navigate, mountain bike, and trek their way through the rugged mountains of Pulaski County and paddle the New River while battling the elements of Mother Nature. Talented navigators will sail through the extensive orienteering portion of the course while strong trail runners will gain time in the long trek legs and skilled mountain bikers will love the technical sections of the bike trails.
Other
Other
Virginia
Hiwassee
Odyssey One Day Xtreme Adventure Race
The Odyssey One Day Xtreme will have unsupported teams of 2, 3, 4 and soloist navigate, paddle, mountain bike, and trek their way through the beautiful mountains and waterways surrounding Fairy Stone State Park, while battling the elements of Mother Nature, by using only a map and compass.
Adventure
Virginia
Stuart
Odyssey Trail Running Rampage
40 Miles
Marathon
Half Marathon
5 Miles
Virginia
Milboro
Odyssey Trail Running Rampage (40, 26,13,6 miler)
The Odyssey Trail Running Rampage will bring in Fall with four great trail running races, The Trail Six-Miler, The Trail Half Marathon, the Trail Marathon, and the 40 mile Trail Ultra. All of these great races are part of the 2014 Trail Runner Trophy Series . These trail races will give athletes the opportunity to run on some of the best trails in the Southeast at a gorgeous state park nestled in the mountains of VA, Douthat State Park. Get together with family and friends this a weekend at Douthat State Park which has a lot to offer, hiking, mt.biking, paddling, fishing, and relaxing.
40 Miles
Marathon
Half Marathon
6 Miles
Virginia
Millboro
Odyssey Trail Trail Running Rampage (40, 26, 13, and 6 miler)
Stunning views, waterfalls, and gorgeous trails grace this incredible trail marathon and half-marathon course. With a 3500' elevation gain on the full marathon course, (1750' on the half), this will prove to be the most challenging race you have ever done!
40 Miles
Marathon
Half Marathon
Virginia
Millboro
Odyssey Wild Wonderful 24 Hour Adventure Race
The 8th edition Odyssey Wild Wonderful 24HR will be a FUN and CHALLENGING event for all adventure racing levels. Teams of 1, 2, 3 & 4 will trek with map and compass, ride mountain bikes up, over, and whitewater raft through the New River Gorge!!! Racers will get to have a bit of class V fun as part of the Wild Wonderful 24.
Adventure
West Virginia
Minden
Odyssey Wild Wonderful 24 HR AR
Adventure
West Virginia
Clifftop
Odyssey Wild Wonderful 24Hr Adventure Race
24 hour Adventure Race
Other
West Virginia
Cliftop
Odyssey Xtreme Sprint Adventure Race
The Odyssey Xtreme Sprint will have unsupported teams of 2, 3, 4 and soloist navigate, paddle, mountain bike, and trek their way through the beautiful mountains and waterways surrounding Fairy Stone State Park, while battling the elements of Mother Nature, by using only a map and compass.
Adventure
Virginia
Stuart
Off Road Oyster- Glenwood Springs
Think the tv show the Amazing Race, teams of 2 - 4 will travel on foot and bike on a mystery adventure race in Glenwood.
Adventure
Colorado
Glenwood Springs
OFF ROAD RAMBLE 5K/10K
Pinto Lake County Park Watsonville. Course will be a combination of trail and dirt road with some rolling hills and scenic views of the Santa Cruz hills.
10 K
5 K
California
Watsonville
Officer Shawn Silvera Memorial Run
On Saturday, August 27, 2011, the Sixth Annual Officer Shawn Silvera Memorial Run will take place at the Long Lake Regional Park. With a variety of activities for families and races for all ages, this event will celebrate life and family.
5 K
Minnesota
New Brighton
Ogden Marathon
The Ogden marathon has the potential to become a destination marathon simply because of the wonderful course. The gentle downhill lends itself to a fairly fast, relatively easy course. 950ft Drop from top to bottom. No hill climbs to speak of. Most of the course is flat and fast. The 6 miles from the top of the canyon through the bottom make up about 65% of the total elevation drop.
Marathon
5 K
Utah
Ogden
Ogden Santa Run
The Jolliest 5K in Utah. All registered runners get a full and complete Santa Suit to run this 5K in. Along the course you will find milk and cookie stops (with water) to aid the Santa's on their journey. Christmas Music plays over head. This race is followed by a Christmas Parade, the lighting of the Ogden Christmas Village, fireworks and is a lot of fun.
5 K
1 Mile
Utah
Ogden
Oglesby Turkey Trot 3 Miles
Starved Rock Runners Circuit Race. Start Thanksgiving Day off right with a 3 mile run with your friends. Enjoy homemade stuffing and beer after the run. Information contact John Steele
3 Miles
Illinois
Oglesby
Oh, Mama! 5k
Lace up your running shoes for the Oh, Mama! 5K run/walk on May 5th, 2014. Proceeds from the race will benefit the Banks-Jackson Emergency Food Bank - dedicated to providing food for those in need. ...(continued)
5 K
Georgia
Commerce
OHara Leprechaun Run
All proceeds from the race will support The O'Hara Track Alumni Committee.
5 K
Pennsylvania
Springfield
Ohio Township 5K and Kids Fun Run
The 8th Annual Ohio Township 5k and Kids Fun Run 2015 Saturday, September 12, 2015 at 9:00 am Ohio Township Community Park 325 Nicholson Road Sewickley, PA 15143
5 K
Pennsylvania
Sewickley
Ohlone Wilderness Trail Run
The Ohlone 50K is a point-to-point race traversing the entire Ohlone Wilderness Trail, a tough 31 mile distance run on trails and fire roads. The trail crosses sections of four East Bay Regional Parklands: Mission Peak Regional Preserve, Sunol Regional Wilderness, Ohlone Regional Wilderness, and Del Valle Regional Park.
50 K
California
Fremont
Oil Creek 100 Trail Runs
Oil Creek State Park's rugged Gerard Hiking Trail - 50K loop course - primarily single track - Titusville PA - birthplace of the oil industry in 1859 and boyhood home to college football legend Coach ...(continued)
100 Mile
100 K
50 K
Pennsylvania
Titusville
Ojai Half Marathon 5k, 10k
Ojai Half Marathon 5k 10k is a one loop course along the famous Ojai bike trail and you will run right past Lake Casitas too. A rolling hills course that has something for everyone. Come join the fun!
Half Marathon
California
Ojai
Ojai to Ocean Marathon and O2O Half Marathon
The Ojai 2 Ocean Marathon is 26.2 miles of mountain and oceanfront scenery. Starting in beautiful Ojai, California, the course begins at 700 ft. altitude and gradually descends to sea-level finishing near the historic Ventura, California Pier. The course is a fast, USATF certified Boston Marathon Qualifier.
Marathon
Half Marathon
California
Ojai
Oklahoma 2014 GREAT AMAZING RACE (03.30.14) adults and kids adventure race
Official Site: www.GreatAmazingRace.com.  “Where Family Smiles & Health Rule the Day!” A fun family friendly obstacle/adventure race for teams of two (adults & kids grades K-12), modeled after the sho ...(continued)
Adventure
Oklahoma
Edmond
Oklahoma City Memorial Marathon
Certified. Flat to gently rolling; runs through downtown, state capitol, and along Lake Hefner.
Marathon
Oklahoma
Oklahoma City
OktoberFAST 5K at Germanfest
Stein's up! Germanfest's OktoberFAST 5K is moving into downtown Indianapolis this October! Be first to yodel your way across the finish line. Afterward, stick around for all that Indy can offer in Ger ...(continued)
5 K
Indiana
Indianapolis
Oktoberfest 13.1 and 10K
German themed Half Marathon is beautiful park setting in Philadelphia. Great German agegroup awards.
Half Marathon
10 K
Pennsylvania
Philadelphia
Oktoberfest 5k Fun Run
5k Fun Run (Approx. 3.1 miles) The course will be through the surrounding neighborhood. Starting and ending at St Paul’s on Chester Dr. The run is part of the Oktoberfest celebration. Pre-Registr ...(continued)
5 K
95376
Tracy
Oktoberfest Classic 10K
Flat 10K course. prize money
10 K
Ohio
Minster
Oktoberfest Marathon
The Oktoberfest Marathon has a beautiful race course that encompasses our lakeshore area.
Marathon
Half Marathon
5 K
Michigan
Spring Lake
OktobeRun Half Marathon and 5K Run/Walk
On October 28, 2017, Redwood City will host the 7th Annual Redwood City OktobeRun Half Marathon and 5K. We are still one of the few road half marathons on the Peninsula.
Half Marathon
5 K
California
Redwood City
Oktoebrfest 5K Fun Run
5K Fun Run through neighborhood streets of Tracy.
5 K
California
Tracy
Old Bridge Run
Come join us for the first Old Bridge Run. June 6th, 2015. Proceeds going to support the Bridgeton Elementary Running Club. Preregistration is recommended and can be done on line and at Bridgeton Elementary 230 Branch Canal Road New Bern NC 28560 (252-514-6425) and Bridgeton Town Hall 202 B Street, Bridgeton, NC 28519 (252-637-3696) Registration with shirt guarantee ends: May 8, 2015 after May 8 there is not a guarantee of shirt size on race day. Cost is $25 Students and $30 Adults. Race tees are an athletic material (no cotton) and come in child and adult sizes also cut for men and women. Registration is from 8:00 to 8:45am. Bridgeton United Methodist Church 510 B Street, Bridgeton, NC 28519 Race starts at 9:00am
5 K
1 Mile
North Carolina
New Bern
Old Dominion 100 Memorial Run
The Old Dominion 50 and 100 Memorial Runis an out and back loop trail through the Massanutten Mountains, Shenandoah River Valley and Woodstock, Virginia with significant climbs, 14,000 feet of gain. The course is planned to be a fair test of endurance running, 50 and 100 miles cross-country in one day, it is a worthy challenge.
Virginia
Woodstock
Old Fashioned 10 Miler and Fast 5K (OFTM)
17th annual running of the Old Fashioned 10 Miler and Fast 5K through streets of Foxboro, MA. Events take place February 19, 2012 and races will be capped this year at 1000 runners. Rolling course for ...(continued)
10 Mile
5 K
Massachusetts
Foxboro
Old Goats 50 Mile Trail Race
The Old Goat's 50 Mile Trail Race is a modified figure eight course that starts and finishes at Blue Jay Campground, located in the Trabuco region of the Cleveland National Forest.
50 Mile
California
Lake Elsinore
Old Haul Road Pescadero Creek County Park Half Marathon
Hilly loop course, mostly on trails with switch-backs.
Half Marathon
California
Pescadero
Old Koloa Sugar Mill Run
The Rotary Club of Kauai is pleased to announce their 12th annual Old Koloa Sugar Mill Run set for Saturday, November 15, 2014 at Anne Knudsen Park, Junction Maluhia Rd (RT520) & Emi Rd, Koloa. This is Kauai’s premier 5-Km, 10-Km, Half Marathon Runs, and non-competitive 5-K Walk.
Half Marathon
10 K
5 K
Hawaii
Koloa
Old Mulkey Marathon
The Course Stats: USATF Certified - Distance 42.19km - 100% Paved Surface - Start & Finish Altitude is 850ft - Highest Altitude is 1025ft - Lowest Altitude is 750ft The Configuration: (2 Loops For Marathon) (1 Loop For Half)
Marathon
Kentucky
Tompkinsville
Old Pueble 50mi Endurance Run
50 mile loop course on forest service roads and trails through the southeastern part of the Santa Rita Mountains (part of the Arizona Trail). Elevation at Start/Finish is 5142 and ranges between 4031 and 5847 with an average grade of 6%. Time Limit: 15 Hour Overall & 7 ˝ hour limit at Box Canyon.
50 Mile
Arizona
Sonoita
Old Roundhouse Trail Days 5k
5k Run/Walk starting at Lylah's Marsh and ending in Elma. Please join us.
5 K
Iowa
Elma
Old Roundhouse Trail Days 5k Run/Walk
One of Northeast Iowa's premier 5k Events.
5 K
Iowa
Elma
Old School Trail Run
An awesome 5 mile Trail Run/Race or a 1 mile adventure walk through the beautiful trails of The Wissahickon Park. The race purpose is to raise money for the Challenged Athletes Foundation. CAF provide opportunities and support to people with physical disabilities so they can pursue active lifestyles through physical fitness and competitive athletics. CAF believes that involvement in sports at any level increases self-esteem encourages independence and enhances quality of life. Awards to the top overall M/F race finishers and overall age group winners as well as top fundraisers. Each registrant receives, T Shirt, refreshments, water stations, prizes, etc. (must register by 9/28 to be guaranteed a shirt). Race limited to first 400 runners.
5 Miles
Pennsylvania
Philadelphia
Old Timers Day 5k and Fun Run
5k Fun Run
5 K
Missouri
Southwest City
Old Town 5k
5k run through historic Old Town Temecula. With old west shoot outs, bank robberies and more along the route.
5 K
.5 Miles
California
Temecula
Olde Towne Rocket Race 5K Campus Run/Walk
Olde Towne Rocket Race Campus 5K Run / Walk - The University of Toledo - Camp Courageous - Dave's Running - UT Track and Field Team - April 28th 10a.m.
5 K
Ohio
Toledo
Olde Wethesfield 5K/10K
Old Wethersfield 5K & 10K Cove Park, Wethersfield, CT Start Time - 8:30 am HMF FitKids Fun Runs – 10:00 am This is a beautiful 5K and 10K course that travels along the historic streets of Old We ...(continued)
10 K
5 K
Connecticut
Wethersfield
Oleksak Lumber Spring Half Marathon
A rolling 13.1 mile Certified Course. Mostly rural with most of the hills in the first 4 miles. 6 Aid stations along the course. This is a great tune up for the Boston Marathon.
Half Marathon
Massachusetts
Westfield
OLG Run/Walk/Relay and Doggie Dash
OLG School 5k
5 K
North Carolina
Greensboro
OLY TROT
November 24, 2011 (THANKSGIVING DAY!) 9AM start $30/person before November 3; $35/person after November 3. You must also bring a canned food donation for the Thurston County Food Bank. Each runner will receive custom ARM WARMERS!
4 Miles
Washington
Olympia
Omaha Marathon
RACE ONE OF MIDDLE AMERICA’S GREATEST MARATHON CITIES! From the Marathon to the Mile, the 43rd annual Omaha Marathon offers “a distance for everyone!”(TM) as you race through Nebraska’s most vibra ...(continued)
Marathon
Half Marathon
10 K
5 K
1 Mile
Nebraska
Omaha
Omaha Turkey Trot
5 K
LAKE ZURICH
Omaha
Omahas Great Pumpkin Run
Omaha's Great Pumpkin run is an exciting event for the entire family. The event will feature a Spooktacular 5k, Monster Mile, and 400m Boo Run. Wear your favorite costume for a chance to win great prizes!
5 K
1 Mile
Nebraska
Papillion
Omak Orchards in Bloom Half Marathon, 10k
Fresh air, sunshine, 360 of breath taking of Eastern Washington mountain peaks, rural hospitality at it's best.
Half Marathon
10 K
Washington
Omak
On A Mission 5k Twilight
Certified Course: NC-11033-PH Twilight 8:00 PM start. $100 Top Overall Male and Female winner. The Race: The 7th annual On A Mission 5K will start and finish at Crossroads Church located at 2 ...(continued)
5 K
North Carolina
Concord
On A Mission Twilight 5k Run/Walk
On A Mission Twilight 5k Run/Walk
5 K
North Carolina
Concord
On the Road for Education
This unique marathon covers a wide array of running surfaces including streets, country roads, paved trails and dirt trails. The course takes you through historic downtown Mason City, on to our ...(continued)
Marathon
Marathon
Half Marathon
10 K
5 K
Iowa
Mason City
Once in a Blue Moon
Once in a Blue Moon is a fixed time event, where by you run, walk, crawl as many miles as you are able (or wish) to in the allotted time. Chose from 12 Hours, 6 Hours, 3 Hours, or 1 Hour. The couse ...(continued)
12 Hours
6 Hours
Nevada
Henderson
Oncor Mayor’s Race 5K
Join the Dallas Marathon for the 2015 Oncor Mayor’s Race 5K on Saturday, December 12, 2015, which will start & finish at Reunion Park in downtown Dallas. This 5K (3.1-mile) event is for runners looki ...(continued)
5 K
Texas
Dallas
One Hell of a Run
Come join us for this Halloween theme run at the Heart and soul of Hollywood, The Griffith Park. This is going to be "One Hell of a Run".
5 K
California
Los Angeles
One Love 4 One City
Do you want to jump start your fitness, move towards a healthier lifestyle? The Kids Club at Vallejo Berea is putting on a 5K (3.1) mile Fun Walk/Run. This will be a perfect way for first timers, kids, families to get out and exercise and complete a 5K.
Half Marathon
California
Vallejo
One Lucky Buckeye
This all-female event raises awareness for women’s heart health and proceeds support cardiovascular research at Ohio State. Heart disease is the number one cause of death for women in the United State ...(continued)
4 Miles
2 Mile
1 Mile
Ohio
Columbus
One Mile Turkey Trot
Long-sleeve T-shirt for all participants. Chip timing and sound system. Out & Back/Loop course is flat & fast with no sharp turns to slow down your momentum.
1 Miles
Missouri
Sikeston
One Step Closer...Autism Walk and 5K Run
Join us on November 6, 2010, for our 4th annual “One Step Closer... Autism Walk/5K Run.” Participants will circle the scenic lake at Centennial Park in Ellicott City, MD. Registration will start at ...(continued)
5 K
Maryland
Ellicott City
ONEHOPE ACT Today! for Military Families 5k/10k Run/Walk and Family Festival
Join us for the 7th Annual ONEHOPE ACT Today! for Military Families 5k/10k Run & Walk on April 15, 2017. Features 5k, 10k and 1-mile courses and a festival with live music, 30+ vendor booths (including an autism resource fair), beer and wine garden, kids' zone and more.
10 K
5 K
1 Mile
California
San Diego
ONiantic 5k
March 13, 2010 O’Niantic 5K March 13 - 9:30 a.m. start– Methodist Street, Niantic
5 K
1 Mile
Connecticut
Niantic
ONiantic 5k and Wee Mile
O’ Niantic 5K Methodist Street, Niantic, CT Start Time – 9:45 am Kid’s Wee Mile – 9:00 am Ready for some shenanigans? Join our Irish running party on a great 5K course through the village of Ni ...(continued)
5 K
1 Mile
Connecticut
Niantic
Op Grad Boo Hoot 5K
Park Ridge Op Grad 2012 'Boo Hoot" 5K Fun Run/Walk
5 K
New Jersey
Park Ridge
Open Baskets 5k
Dash-it for Baskets: Moving Forward for Mental Health - Saturday, May 4th, 2013 The Dash-it for Baskets run/walk is a new race for 2013! Proceeds benefit Open Baskets, a not-for-profit group tha ...(continued)
5 K
Minnesota
Eagan
Opening Doors Dash 5K Run/Walk
Opening Doors 5K Run/Walk in Dubuque, IA on Saturday April, 14, 2012.
5 K
Iowa
Dubuque
Operation Hotel Victory
5K/10K Run or Walk
10 K
5 K
Washington
Spokane
OPPAA POP Arts 5K Race and Fun Run
This is a day of fun for the entire family. This is 5K Race and Fun Run that is going to be great. After the race there is an Art Festival with Food Trucks, Vendors, Bands, Art Exhibits, Silent Auction, and Karaoke. March 28, 2015.
5 K
Florida
Orange Park
OPSF Ultra 50/50
The course is set in Owen-Putnam State Forest, located 10 miles west of Spencer, IN. The course consists of completing two loops on rolling to hilly terrain on rugged trails, along with fire and coun ...(continued)
50 Mile
50 K
Half Marathon
Indiana
Spencer
Oral Cancer Foundation 5K Walk/Run in memory of Peter McGee Hoffman
April 16, 2016 5K at USATF certified Sligo-Dennis Avenue Park
5 K
Maryland
Silver Spring
Orange Blossom Half Marathon and 5K
Half Marathon and 5K Sommer Sports Florida
Half Marathon
5 K
Florida
Tavares
Oregon 100K Relay
Uberthons 100K Relay at Champoeg Park
100 K
Oregon
St. Paul
Oregon Fall Half
Oregon Fall Half & 5k.
Half Marathon
5 K
Oregon
Forest Grove
Oregon Food Bank Turkeython
Timed 5k and kids fun run benefiting the Oregon Food Bank.
5 K
Oregon
Hillsboro
Oregon Spring Half Marathon
Oregon Spring Half Marathon
Half Marathon
5 K
Oregon
Canby
Oregon Spring Half Marathon
Oregon Marathon & Half Marathon. Mt. Angel, Oregon. Oktoberfest
Marathon
Half Marathon
Oregon
Forest Grove
Oregon Summer Half Marathon
The 2nd Annual Summer Half Marathon is located on the Banks Vernonia Trail - part of the Washington County Trail Systems. Come see why Oregon is the Birthplace of Running in America.
Half Marathon
Oregon
St. Paul
Oregon Wine Country Half Marathon
13.1-mile point-to-point, team competition, cash prizes, wine and music festival
Half Marathon
Oregon
Dayton
Original 13 Half Marathon
Minnesota Half Marathon, July 4, Running
Half Marathon
Minnesota
Sauk Rapids
Orlando Challenge
Challenge Nation is coming to Orlando! Participate in an urban adventure race, "Amazing Race" style. Teams of two or more dash around the city solving clues, exploring new parts of the city and compete for a chance to participate in the National Championship race in Las Vegas this November.
Adventure
Florida
Orlando
Orlando Xtreme - Half Marathon, 10K, and 5K
Orlando Half Marathon, 10K, and 5K
Half Marathon
10 K
5 K
Florida
Christmas
Orlando Xtreme Marathon
The Oralndo Xtreme Half Marathon is one of the best off road running marathons in Florida and one of the most scenic anywhere! In its 5th year, it is fast becoming a regional favorite. After training and racing in fall and early winter events use this course, designed to alleviate injury to knees, back and joins, to capitalize on your "Super Fitness." The course is staged on berm roads, through fields and on single track and takes place in beautiful natural scenery.
Half Marathon
10 K
Florida
Orlando
Orlando/Tampa 2014 GREAT AMAZING RACE Adults and Kids Adventure Race
Official Site: www.GreatAmazingRace.com.  “Where Smiles & Teamwork Rule the Day!” An annual family-friendly obstacle/adventure race for teams of two (kids grades K-12 & adults), modeled after the sho ...(continued)
Adventure
Florida
Seffner
ORound the Loch Run Half Marathon
All races are around or in the vicinity of Five Island Lake.
Half Marathon
Iowa
Emmetsburg
Oroville 5K River Run
5k run through downtown Oroville and along the Feather River to celebrate the opening of the Oroville Farmer's Market.
5 K
California
Oroville
ORRC Hagg Lake Run
10.5 Miles
10 K
5 K
Oregon
Gaston
ORRC Vernonia Marathon
Point to point full and half marathon, running along the Banks-Vernonia Trail (scenic & paved).
Marathon
Half Marathon
Oregon
Vernonia
ORRC Y2K Run
Run your first half marathon for 2017! The half marathon and 10K course cover scenic roads in Oregon Wine Country. Pancakes after the race!
Half Marathon
10 K
Oregon
Forest Grove
Orting Turkey Trot
Orting Turkey Trot, Saturday, November 19, 8:30 am to 11:30 am, with a 1K walk/jog, 5K, 10K and 15K runs on the Foothills Trail. Visit www.ortingturkeytrot.org or call 360 893-3150 (Orting Food Bank) or 253 468-2519 (Generous Hearts) for registration or more information. $25 to $30 entry fee; free for kids under age 14. Bring a nonperishable food donation if you are able to help the hungry.
15 K
10 K
5 K
Washington
Orting
Osage River Bottom Rowdy Run
Terrain Based Obstacle Race Sleepover Camp. Join extreme athletes, thrill seekers and other fitness buffs at Camp Rowdy on November 3rd and attempt to conquer The Osage River Bottom Rowdy Run in the beautiful Lake of the Ozarks! This five kilometer terrain-based obstacle course featuring wooded trails, steep hills, muddy fields, and sheer bluffs will test your stamina, willpower and intestinal fortitude. Plan a full family and friends week-end of camping, live music, great food, beer and bonfires!
Adventure
Missouri
Kaiser
OShenanigans 5K
O’Shenanigan’s 5K Southington, CT NEW! Start Time: 10:00 am Kid’s Wee Mile: 9:30 am This brand new 5K starts and finishes outside the new Kinsmen Brewing Company, just steps off the Farmington ...(continued)
5 K
Connecticut
Southington
Oside Turkey Trot and Kids 1 Mile
Each year, colorful and imaginative costumes are a highlight of the O'side Turkey Trot. This year, why not be a part of the costume fun and have your creativity rewarded?
5 K
1 Mile
California
Oceanside
OTHTC High Desert Ultra 50K
The 2012 Over The Hill Track Club High Desert 50K Ultramarathon and 30K will be held on Sunday, December 2nd. December is a great time for running on our desert roads and trails. Mountain views are p ...(continued)
50 K
30 K
California
Ridgecrest
OTHTC High Desert Ultra 50K and 30K
A 30K and 50K that boasts great views and wonderful weather! Come join the Over the Hill Track Club in Ridgecrest this December for an unbelievable experience!
50 K
30 K
California
Ridgecrest
Ottawa Hills Back to School 5k
This race starts and finishes at the Ottawa Hills High School track and runs through the Village of Ottawa Hills. The course has water stops and is accurately measured by Toledo Roadrunners.
5 K
Ohio
Ottawa Hills
Otter Creek Trail Marathon
Marathon
16 Miles
8 Miles
Kentucky
Brandenburg
Ottumwa YMCA Survival 5k Challenge
Obstacle race with mud, get ready for a challenge.
Adventure
Iowa
Ottumwa
Ouachita Trail 50
Course: Out and back with 44 miles of trail and six miles of asphalt for 50 mile. Out and back with 25 miles of trail and six miles of asphalt for the 50K. Trails over Pinnacle Mountain will be utilized on the “out” portion only. Several highway crossings will be involved. There will be no traffic control. Please be responsible and be careful!
50 Mile
50 K
Arkansas
Little Rock
Out and Back Party Run
The Out & Back Party Run is a unique distance road race (+/- 4 miles) and after-party that connects runners from Philadelphia and surrounding areas for an evening of running and socializing.
4 Miles
Pennsylvania
Philadelphia
Outback Scramble
A 5 Mile Wacky Cross-Country course. Benefits Gleaner's Food Bank. Come run, get dirty and have fun!
5 Miles
Indiana
Indianapolis
Outrun Homelessness in Collin County 5K and Fun Run
Outrun Homelessness in Collin County, Texas at LifePoint Church, Plano on April 16, 2016
5 K
1 Mile
Texas
Plano
OUTRUN THE COPS! and Walk For The Kids
Have you ever wondered if you could outrun the cops? Now is your chance to test your skills with no consequences. **Only first 500 registered get the much wanted "Badge Medal" OUTRUN THE COPS! & WALK FOR THE KIDS charity race is a great event for athletes and families alike.
10 K
5 K
Illinois
Gurnee
Outrun the Sun
Outrun the Sun is a unique run/walk event that starts in the evening to keep participants out of the suns harmful rays. Donations support the education and research of Melanoma.
5 Miles
5 K
Indiana
Indianapolis
Ovarian Cancer Run/Walk
Come out and support the initiatives of Ovar’coming Together which include education, survivor support, and research for ovarian cancer. The Run & Walk includes a 5K Run/Walk, a 1-mile walk, and a Ja ...(continued)
5 K
1 Mile
Indiana
Indianapolis
OVMP Run to the Wall
https://runsignup.com/race/results/?raceId=5358#resultSetId-12165
Half Marathon
10 K
5 K
Ohio
Clinton
Owensboro 10 Miler
https:/runsignup.com/race/ky/owensboro/10miler
10 Mile
Kentucky
Owensboro
Owensboro Bootlegger 5K
Transition back to the 1920’s Prohibition Era rum running and race through the wooded trails of the backcountry. Like our bootleggin’ ancestors, see if you can make it through the moonlit woods to get to the stompin’ grounds, where you can enjoy a nice glass of moonshine and flatfoot it to bluegrass and old timey music.
5 K
North Carolina
Kentucky
Owensboro Half Marathon and 4 Person Relay Race
The City of Owensboro’s Department of Parks and Recreation will be hosting their 7th Annual Owensboro Half Marathon on Saturday, September 17, 2016 Sponsored by Academy Sports & Outdoor. New for this ...(continued)
Half Marathon
Kentucky
Owensboro
Owyhee Off-Road Challenge
Half, 10k, 5k
Half Marathon
10 K
5 K
Oregon
Adrian
Oyster Racing Series
Make life awesome for a few hours! The Merrell Oyster Racing Series is billed as the Ultimate Urban Adventure Race for its uncanny ability to combine athleticism with thought-provoking strategy. Your ...(continued)
Adventure
Texas
Austin
Oyster Urban Adventure Race
This race is a blast! The race is billed as the “Ultimate Urban Adventure Race” for its uncanny ability to combine pure athleticism with thought-provoking strategy. Your team will run-bike-paddle-climb- and perform other crazy athletic stuff to race around the city, answering clues and completing tasks. This amped, one-day race will have you doing things and in places you never experienced before!
Adventure
Urban Adventure
Colorado
Denver
Oyster_The Race
Oyster_The Race is your ultimate adventure race. Teams work together to solve a mystery course throughout the city. Both intelligence and athleticism are a must. Participants will be both running and biking around the city to solve the bizarre tasks and mind-wrenching puzzles.
Adventure
California
San Francisco
Ozark Greenways Adventure Race
The Ozark Greenways Adventure Race (OGAR) is a sprint adventure race (8-14 hours) which features running, trekking, mountain biking, orienteering and paddling. All distances and the race itinerary are kept secret until race morning.
Adventure
Missouri
Springfield
Ozark Trail 100 Mile Endurance Run
The Ozark Trail 100 Mile Endurance Run is a point-to-point 103 mile race on the Ozark Trail through the Mark Twain National Forest in south central Missouri. The race is mostly on single track trail w ...(continued)
100 Mile
Missouri
Steelville
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