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 in Ouray, Colorado, scheduled for July 17, 2026. The course runs in the San Juan Mountain range and finishes at Fellin Park after a final climb to the Bridge of Heaven and a subsequent descent to the park.
The race lists approximately 41,862 feet of elevation gain spread across fourteen climbs, including a final roughly 5,000 foot ascent before the last descent. Racers are required to carry a SPOT tracker provided by the organizers; runner locations are updated every five minutes.
Each participant must complete eight hours of volunteer service prior to July 1 or pay a $100 opt out donation to the 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.
Top finishers in the 100 mile event receive cash awards: $1,000 for the top male finisher and $1,250 for the top female finisher. Payment of these awards is contingent on the results of urine and/or blood testing for banned substances such as steroids, testosterone, EPO, and THC. The event specifies a THC threshold of 150 ng/ml for a positive result. The race is no longer processed as a UTMB qualifier. Visit the organization's website for the most recent information.