Ouray 100 Mile Endurance Run
Ouray, United States • 17 Jul 2026
Event overview
The Ouray 100 Mile Endurance Run is a 100-mile trail race held in Ouray, Colorado, with Fellin Park listed as the event location. The course has an elevation gain of 41,862 feet and includes fourteen climbs. The event uses live tracking; runners are required to carry a provided SPOT tracker with location updates every five minutes. The event is no longer a UTMB qualifier.
Logistics and rules
Packet pickup is available the day before and on race day at Fellin Park. The race has a 52-hour cutoff for the 100-mile distance. 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 their service form or paid the opt-out fee by July 10 will forfeit their registration and will not be permitted to participate.
Prizes and testing
A cash purse is offered: $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 testing of winners after the event. Banned substances to be tested for include, but are not limited to, steroids, testosterone, EPO, and THC. The event specifies a THC threshold of 150 ng/ml for a positive result. Visit the organization's website for the most recent information.