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Event Distance(s) State / City
Ice Age Trail Race 50k 50mi
The Ice Age 50K is a part of the Montrail Ultra Cup series. By participating in the Ice Age 50 Kilometer Solo Run you are automatically entered in the Montrail Ultra Cup point's race.
50 Mile
50 K
La Grange
Ice Bowl Winter Ultra
Ski, Bike or Run. Winter Ultra. Self-supported. Adventure race.
Iditarod Trail Invitational
The Iditarod Trail Invitational run,bike, ski race follows the Iditarod Trail for 350 miles to McGrath Or 1,000 miles all the way to Nome.
1000 Miles
350 Miles
Ijams Nature Center 50K & 1/2 Marathon Trail Runs
Come enjoy the beauty of Ijams Nature Center. The 275 acre wildlife sanctuary and environmental learning center are our hosts for these challenging distance running events.
50 K
Half Marathon
Im not a Fool 50K
The challenging 50K course follows two loops on the Croom Hiking Trail through central Florida's long leaf pines and scrub oak covered hills, past creek bottoms and cypress ponds. There will be a cutoff time of 6:00 pm. Race starts at 7:00am.
50 K
Indian Creek Fifties
50K and 50 Mile ultras in Pike National Forest.
50 Mile
50 K
Indiana Trail 100
The Indiana Trail 100 is a non-profit event managed by ultra-runners with the net proceeds going back to the park. We are convinced that once you run on our scenic course you will keep coming back. We ...(continued)
100 Mile
Iron Horse 100 Mile Endurance Run
Rail Trail and State Forest run with 100 mile, 100km and 50 mile options. Partially paved and balance on Forest Service dirt trails and roads.
100 Mile
100 K
50 Mile
Iroquois Trails Ultras
The Iroquois Trails Ultras are 50 and 100 mile ultramarathons located in Virgil, N.Y. and are intended to provide endurance trail athletes an additional opportunity in the under-represented northeast. The event uses The Finger Lakes Trail sections spanning the Tuller Hill and Kennedy State Forests, paired with the mountainous terrain of Greek Peak Mountain Resort. This year’s races will begin at 6 a.m. on Saturday September 19, 2009, and will include a 50-mile race, a 100-mile race, and a 100-mile relay (new this year). Entry will open on February 5th, 2009, and be limited to the first 150 qualified entrants in both of the solo events. The 100 Mile Relay will be open to only the first 30 teams.
100 Mile
50 Mile
New York

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