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Date Event Distance(s) State / City
10/21/17 
Saturday 
27 days away 
Indian Creek Fifties
50K and 50 Mile ultras in Pike National Forest.
50 Mile
50 K
Colorado
Sedalia



Not all races have been rescheduled for this year. Below is a list of additional events for Colorado
Date Event Distance(s) State / City

Next Date
Unknown

Boulder Backroads Marathon
The Boulder Marathon has been voted "Best Colorado Marathon" by Colorado Runner magazine, "Nation's Best Kept Marathon Secret" by Runner's World Magazine and "Best Event Apparel" by Rocky Mountain Sp ...(continued)
Marathon
Half Marathon
Colorado
Boulder

Next Date
Unknown

24 Hours of Boulder
Solo, team relay, 12 hour and 6 hour nighttime fun run categories. The course is an even mix of pavement, dirt road and smooth single track with a stunning view of Boulder’s front range. And after eac ...(continued)
24 Hours
12 Miles
6 Miles
Colorado
Boulder

Next Date
Unknown

24 Hours of Boulder....the Run
This race is run on the beautiful trails at the Boulder Reservoir with great views of the snow covered peaks. The course is a flat 7.14 miles (lap 14 ends at exactly 100 miles) with approximately 100 feet gain per lap with an aid station at approximately 3.5 miles.
Other
Colorado
Boulder

Next Date
Unknown

American Discovery Trail Marathon
THE COURSES: A Pikes Peak Road Runner Managed and Directed Event. The event courses have little altitude change; and follow Monument and Fountain Creeks, almost entirely on trails. A few rol ...(continued)
Marathon
Half Marathon
5 K
Colorado
Colorado Springs

Next Date
Unknown

American Heroes Run
9/11 American Heroes Run. We will never forget the tragic events of 9/11/01 and how it changed our nation forever. Please join us for this special day and celebration of the greatest nation on earth ...(continued)
Marathon
Half Marathon
9.11 Miles
9 Hours
5 K
Colorado
Longmont

Next Date
Unknown

Aspen Backcountry Marathon
The most challenging race you've never run...because it's NEW! The Aspen Backcountry Marathon in Aspen, CO.
Marathon
Colorado
Aspen

Next Date
Unknown

Autumn Color Run
The Autumn Color Run is home to one of Colorado’s best half marathon routes. Held each year on the third weekend in September as the aspen leaves are changing from green to gold. The half marathon rou ...(continued)
Marathon
10 K
5 K
1 Mile
Colorado
Buena Vista

Next Date
Unknown

Blue Sky Marathon
The Blue Sky Marathon trail race will start and finish at the Blue Sky Trailhead in the Horsetooth Mountain Open Space near Fort Collins, CO. The route will run between Horsetooth Mountain Park an ...(continued)
Marathon
Colorado
Fort Collins

Next Date
Unknown

Boulder 100
Fast, flat course with lots of aid stations. The course is run on the trails around the beautiful Boulder Reservoir. It consists of 7.14 mile laps and runners will be given 30 hours to complete the co ...(continued)
100 Mile
30 Hours
Colorado
Boulder

Next Date
Unknown

Boulder Marathon
People have enjoyed running and walking on the Boulder "backroads" for generations. And though there have been organized marathon and half marathon races held on the backroads dating back to the 1970' ...(continued)
Marathon
Half Marathon
Colorado
Boulder

Next Date
Unknown

Buffalo Creek Marathon
Marathon, and a shorter (10km-10mi) race. Near Pine, CO. The trails are fairly smooth, fun and fast.
Marathon
10 K
Colorado
Pine

Next Date
Unknown

Burning Bear Trail Run & Ultra
20mi & 40mi (approx) - 20mi course has 5,000' of climbing, between 9,530'-11,750'. 40mi course has 10,000' of climbing, up to 12,430'. Geneva Park, CO (~5mi south of Guanella Pass).
40 Miles
18 Miles
Colorado
Colorado Springs

Next Date
Unknown

Collegiate Peaks Races
Beginning and ending near the Arkansas River, in Buena Vista, the course primarily follows single track trails along part of the old, historic Midland Railroad as well as through other scenic areas north and east of town. Encompassing great scenery and spectacular views, much of the course runs through lands managed by the National Forest and/or Bureau of Land Mnaagement.
50 Mile
25 Miles
Colorado
Buena Vista

Next Date
Unknown

Colorado Colfax Marathon
The Colorado Colfax Marathon includes four exciting events. Race distances include a 26.2-mile marathon, a 26.2-mile 5 person marathon team relay (10k, 5k, 10k, 5k, 12k), a 13.1-mile half-marathon and a 1 mile run/walk for kids.
Marathon
Half Marathon
Colorado
Aurora

Next Date
Unknown

Colorado Outward Bound ULTRA Relay
24-hour, 170-mile team ultra relay race from Idaho Springs to Glenwood Springs, Colorado. Teams of five ultra runners take on an awe-inspiring course over three mountain passes including the continental divide on singletrack trail, dirt roads, bike paths and paved roads. Benefits Outward Bound.
170 Miles
Colorado
Golden

Next Date
Unknown

CURE Ultra Racing Events
Ultra Trail Race, 20K,50K,50Mile and 100K
50 K
Colorado
Littleton

Next Date
Unknown

Denver Marathon
Join us for a world-class running experience in the Marathon, Half Marathon, or 4-person Marathon Relay. Every detail of the Denver Marathon has been planned with you - the runner - in mind. A world-class race course, a world-class race organization, in beautiful Colorado - all during a perfect time of year!
Marathon
Colorado
Denver

Next Date
Unknown

Desert RATS Kokopelli 150
Desert RATS is a six day, fully supported stage race that covers a distance of approximately 143 miles
150 Miles
Colorado
Moab

Next Date
Unknown

Desert RATS Trailrunning Festival
A weekend of fun and running on the beautiful trails near Fruita, Colorado. The weekend includes a pasta dinner, Trail Marathon, 50K, Double Marathon races and awards party on Saturday, and 5 mile and half marathon races on Sunday.
52 Miles
50 K
26.2 Miles
Half Marathon
5 Miles
Colorado
Fruita

Next Date
Unknown

Devil Mountain Ultra
This remote and legendary classic Ultra brings runners together for two days in the pristine forest of the South San Juan Mountains around Pagosa Springs. 7,500’ of climbing, 10,000’ of elevation, bon ...(continued)
50 Mile
50 K
Half Marathon
10 K
5 K
Colorado
PAGOSA SPRINGS

Next Date
Unknown

Durango Double
This course has been designed to be runner friendly - no killer hills here. Starting on College Mesa, the course quickly but gently drops 360 feet in elevation as you make your way to Main Avenue. This is the biggest elevation change on the course and from mile 5 on the route is flat to rolling and you don't climb back up the hill to Fort Lewis College.
50 K
Marathon
25 K
Half Marathon
Colorado
Durango

Next Date
Unknown

Durango Marathon
these courses have been designed to be runner friendly. Starting on College Mesa the the marathon and half marathon courses quickly, but gently, drop 360 feet in elevation as you make your way to Anim ...(continued)
Marathon
Half Marathon
Colorado
Durango

Next Date
Unknown

Easy Street Marathon
Half Marathon
Colorado
Fort Collins

Next Date
Unknown

Estes Park Marathon
The Estes Park Marathon is the highest paved marathon in the world and one of the most scenic. Our USATF certified course takes you on a spirit-soaring tour of the majestic Estes Valley, gateway to Rocky Mountain National Park.
Marathon
Colorado
Estes Park

Next Date
Unknown

Fort Collins Old Town Marathon
Join us in Mayfor the Annual Fort Collins Old Town Marathon. Participation is limited to 700 for the Marathon and 1,000 for the Half Marathon, so sign up early.
Marathon
Colorado
Fort Collins

Next Date
Unknown

Grand Valley Marathon
The Grand Valley Marathon, 1/2 Marathon, 10K and 5K are made possible by Mammoth Marathons. We are a Non-Profit Organization made up of three race directors and many volunteers. These races were desig ...(continued)
Marathon
Half Marathon
10 K
5 K
Colorado
Palisade

Next Date
Unknown

Greenland Trail 50K
The Greenland Trail 50K is a new trail race located on the front range of Colorado. It was started with the intent to kick off the trail running season by offering a variety of distances to suit your running needs. Run in the Greenland Open Space of southern Douglas County, the Greenland Trail 50K strives to be the premier 50K in Colorado.
50 K
Colorado
Castle Rock

Next Date
Unknown

Hardrock Hundred Mile Endurance Run
100 miles, 33,000' total elevation gain, 11,186' average elevation, low point 7,680' at Ouray, high point 14,048' at Handies Peak.
100 Mile
Colorado
Silverton

Next Date
Unknown

High Mountain Trail Run
Join us for a spectacular day of trail running and support the High Mountain Institute (HMI), a local Leadville non-profit educational institution. The High Mountain Trail Run is a great mid-summer race that can be used to prepare for late-summer ultras or marathons - or just to have a great day of running in the mountains!
50 K
25 K
Colorado
Leadville

Next Date
Unknown

Leadville Silver Rush 50 Mile Trail Run
25 miles out and back within the high altitude environment of Leadville's historic east-side mining district. The route is extreme in true Leadville fashion. Well supplied aid stations with cut-offs.
50 Mile
Colorado
Leadville

Next Date
Unknown

Leadville Trail 100
50 miles out and back in the midst of the Colorado Rockies.
100 Mile
Colorado
Leadville

Next Date
Unknown

Leadville Trail Marathon
26.2 miles of breathtaking, Leadville Rocky Mountain trails, summiting notorious 13,185' Mosquito Pass. Well supplied aid stations with cut-offs.
Marathon
Colorado
Leadville

Next Date
Unknown

Pikes Peak Marathon
These races are very difficult and physically demanding high altitude runs that should not be undertaken without significant preparation. Moreover, the Ascent (and ascent leg of the Marathon) have only limited stretches without a significant uphill grade.
Marathon
Colorado
Manitou Springs

Next Date
Unknown

Quad Rock 50
Taking place on the trails and hills west of Fort Collins in Lory State Park and Horsetooth Mountain Park, the Quad Rock 50 will take you on a tour of the Fort Collins skyline, situated on the northeastern boundary of Colorado’s mighty Rocky Mountains.
50 Miles
25 Miles
Colorado
Bellvue

Next Date
Unknown

Rim Rock Marathon
This will mark the third year for the Rim Rock Marathon, continuing an 19 year tradition of having a run that occurs inside the Colorado National Monument. This venue provides epic views and a world c ...(continued)
Marathon
Colorado
Grand Junction

Next Date
Unknown

Rock N Roll Denver Marathon
Marathon
Half Marathon
Colorado
Denver

Next Date
Unknown

Rocky Mountain High-est Leadville Marathon and Half-Marathon
In World Famous, the Infamous Leadville, Co. Rocky Mountain High-est! America’s Highest! The World’s Highest Road Marathon and Half Marathon.
Marathon
Half Marathon
Colorado
Leadville

Next Date
Unknown

Run Rabbit Run
The race is a spectacular 100 mile hop through the autumn colors of the Routt National Forest and Emerald Mountain of northern Colorado, with a few little jaunts through the terrific little town of St ...(continued)
100 Mile
50 Mile
Colorado
Steamboat Springs

Next Date
Unknown

Runs With Scissor Races
Half-Marathon, Marathon, & 50k held at the Adams County Regional Park, Brighton, Colorado. A 1.31 mile multi-loop course held on a combination concrete multi-use path and scree covered trail with a short section of dirt road.
50 K
Marathon
Half Marathon
Colorado
Brighton

Next Date
Unknown

Sage Burner 50k/25k Trail Race
The Sage Burner is a moderate 25k and 50k run through the sage of the Gunnison valley. This race will take you to the top of the world literally as you run at 8000 feet of elevation.
50 K
25 K
Colorado
Gunnison

Next Date
Unknown

San Juan Soltice 50
The San Juan Solstice 50 mile endurance run is a scenic and very difficult loop through the high San Juans. 12,000'+ elevation gain; mostly trails, some jeeproads. Middle-of-pack runner: expect 12-14 hours. 16:00 cut-off.
50 Mile
Colorado
Lake City

Next Date
Unknown

Sheep Mountain 50-Mile Endurance Run
The Sheep Mountain 50 throws everything it has at runners, challenging you from start to finish, among the mountains and hills lining the western slope of the South Park Valley. Runners looking for a ...(continued)
50 Mile
Colorado
Fairplay

Next Date
Unknown

Silverheels 100-Mile Endurance Run
The Grand-Daddy of all the Human Potential Running Series Races, The Silverheels 100. Put on your dancing shoes and bring everything you’ve got in you to tackle this monster of a 100 miler. A true mou ...(continued)
100 Mile
Colorado
Fairplay

Next Date
Unknown

Silverton 72 Hour Run
The 3rd Annual Silverton Multi-Day Challenge is actually 6 races in one. The 6 day & 1000 Mile Runs will start on August 28th, the 72 hour on August 31st, the 48 hour on September 1st and the 24 hour ...(continued)
72 Hours
48 Miles
24 Hours
Colorado
Silverton

Next Date
Unknown

Silverton Alpine Marathon and 50K
Leaving Memorial Park, follow 18th Street to Cement Street, turning left and then running through Silver Lakes campground. Proceed straight on this road until you intersect asphalt road (County Road 2 ...(continued)
50 K
Marathon
Colorado
Silverton

Next Date
Unknown

South Park Trail Marathon and Half
Starting at an elevation of 9,915’ and topping out at 13,183’ above sea level, the South Park Marathon is one of the highest marathons in Colorado. Run from the South Park Historical District all the ...(continued)
28 Miles
14 Miles
Colorado
Fairplay

Next Date
Unknown

Steamboat Marathon
The Steamboat Marathon and Half Marathon traditionally fill early so register now. Registration opens on January 1, 2012.
Marathon
Half Marathon
10 K
Colorado
Steamboat Springs

Next Date
Unknown

Steamworks Animas Valley Half Marathon
Half Marathon
Colorado
Durango

Next Date
Unknown

The Bear Chase
The Bear Chase is a beautiful 50 Mile, 50km, Half Marathon & 10km trail race just 15 minutes from downtown Denver at Bear Creek Lake Park in Lakewood, CO. An excellent race for first time ultramaratho ...(continued)
50 Mile
50 K
Half Marathon
10 K
Colorado
Lakewood

Next Date
Unknown

The Epic 50K
14,400 feet of elevation gain • average elevation over 11,000 feet 1/3 single track 1/3 cross country 1/3 dirt road EXCELLENT FOR HARDROCK DREAMERS!!!
50 K
Colorado
Silverton

Next Date
Unknown

Tommyknocker 12-Hour
Ultra, Trail run, 12 Hour, Ultramarathon, Colorado
12 Hours
Colorado
Golden

Next Date
Unknown

Trailrunning Festival
This is a difficult course! The 25-mile race will be a single loop connecting the desert trails of Kokopelli’s and adjacent trails. The course rolls between elevations of 4,500 and 5,400 feet with over 4,000 feet of climbing per loop.
50 Mile
25 Miles
10 Miles
5 Miles
Colorado
Fruita

Next Date
Unknown

Turkey Track Trail Marathon and 1/2 Marathon
A trail race through ponderosa and aspen forests with great veiws of the surrounding mountains. Fully stocked aid stations just when you need them.
Marathon
Half Marathon
Colorado
Pagosa Springs

Next Date
Unknown

Turret Marathon
Marathon
Half Marathon
Colorado
Salida

Next Date
Unknown

UltraRace of Champions
100k championship, 50k,trail Half marathon Breckenridge to Vail,
100 K
50 K
Half Marathon
Colorado
Vail

Next Date
Unknown

Vail Victory Trail Marathon
The Vail Victory Trail Marathon has a limited field and spectacular course. 100 runners will race in beautiful backcountry of the White River National Forest. This exceptional course on the northern s ...(continued)
Marathon
Colorado
Vail

Next Date
Unknown

Wild West Relay 200-mile
The Wild West Relay is a 200-mile team running relay race in Colorado designed for runners of all abilities.
Other
Colorado
Ft. Collins
 




 

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