Ouray 100 Mile Endurance Run
Ouray, United States • 17 Jul 2026
Ouray 100 Mile Endurance Run
The Ouray 100 Mile Endurance Run is a 100 mile mountain ultramarathon held in Ouray, Colorado, with an official elevation gain of 41,862 feet and fourteen marked climbs. The course traverses terrain in the San Juan Mountain range and finishes at Fellin Park near the Ouray Hot Springs. The final ascent rises about 5,000 feet to the Bridge of Heaven, after which the route descends back to Fellin Park.
Event logistics include packet pickup the day before and on race morning at Fellin Park, and a 52 hour race cutoff. Runners are required to carry a SPOT tracker provided by the organizers; locations are updated approximately every five minutes.
Each participant must complete eight hours of volunteer service prior to July 1 or pay a $100 opt out donation to Ouray Trail Group. Entrants who have not submitted the required service form or paid the opt out fee by July 10 will forfeit their registration and will not be allowed to participate.
Top finishers are eligible for a cash purse: $1,000 for the top male 100 mile finisher and $1,250 for the top female 100 mile finisher. Payment of cash awards is subject to urine and/or blood drug testing, with banned substances including steroids, testosterone, EPO, and THC. The event has not been a UTMB qualifier since 2022. Visit the organization's website for the most recent information.