Ouray 100 Mile Endurance Run
Ouray, United States • 17 Jul 2026
Ouray 100 Mile Endurance Run
The event is a 100 mile trail ultramarathon in Ouray, Colorado, held in the San Juan Mountain range, with the race base at Fellin Park. The course includes approximately 41,862 feet of elevation gain and fourteen climbs. The final climb gains about 5,000 feet to the Bridge of Heaven, after which the route descends back to Fellin Park.
Each participant is required to complete eight hours of volunteer service prior to July 1. Participants may opt out of the service requirement by making a $100 donation to Ouray Trail Group. Entrants who have not submitted a service form or paid the opt out fee by July 10 will forfeit their registration and will not be permitted to participate.
Racers must carry a SPOT tracker supplied by the organizers; locations will be updated every five minutes. Cash awards are offered to top finishers: $1,000 for the top male 100 mile finisher and $1,250 for the top female 100 mile finisher. Payment of these awards is subject to the results of urine and/or blood testing administered to winners immediately after the event. Tested substances include, but are not limited to, steroids, testosterone, EPO, and THC. THC levels above 150 ng/ml will be treated as a positive result.
Finishers receive a metal belt buckle at Fellin Park and the hot springs are nearby. Visit the organization's website for the most recent information.