Ouray 100 Mile Endurance Run

JUL
17
2026
A 100 mile mountain ultramarathon in Ouray, Colorado, with 41,862 feet of elevation gain, mandatory pre-race volunteer service or a $100 opt out fee, live SPOT tracking, cash prizes subject to drug testing, and a steep final climb to the Bridge of Heaven.
Fri 17 Jul 2026
100 miles

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Ouray 100 Mile Endurance Run

The event is a 100 mile mountain ultramarathon in Ouray, Colorado, with a reported total elevation gain of 41,862 feet and fourteen distinct climbs. The course rises to the Bridge of Heaven after a final 5,000 foot climb and then descends to Fellin Park, with the Ouray Hot Springs located near the finish area.

Runners are required to complete eight hours of volunteer service before July 1 or pay a $100 opt out fee to the Ouray Trail Group. Entrants who have not submitted the service form or paid the opt out fee by July 10 will forfeit their registration and will not be permitted to participate.

The race is no longer a UTMB qualifier. Top finishers in the 100 mile event receive cash awards: $1,000 for the top male and $1,250 for the top female. Payment of these awards is contingent on negative results from urine and/or blood drug testing administered to winners; tested substances include but are not limited to steroids, testosterone, EPO, and THC. The THC threshold for a positive result is 150 ng/ml.

Racers must carry a provided SPOT tracker during the event; runner locations are updated every five minutes. The event uses distinctive podium awards laser cut from traffic cones and includes an Ironton clause that encourages withdrawn runners to return to Fellin Park to support other participants. Visit the organization's website for the most recent information.

100 mi
100 Miler
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