High Five 100 - Lake City, CO

The Sky Pilots Ouray Backyard Ultra is a unique endurance running event held in Ouray, Colorado, starting at Fellin Park. Participants run a 4.167-mile out-and-back course featuring a mix of asphalt track, smooth dirt roads, and the scenic Uncompahgre River Walk with minimal elevation gain (140 feet..

The San Juan Solstice 50 Mile is a challenging ultramarathon held annually near Lake City, Colorado, typically around the summer solstice in June. Established in 1995, the race covers a 50-mile course through high mountain terrain, including snowfields and creek crossings along the Continental Divid..

The John Cappis is a challenging mountain endurance event held in Silverton, Colorado, on June 28, 2025. It features a roughly 50-kilometer course with approximately 19,000 feet of elevation gain, traversing peaks in the San Juan Mountains. The course is mostly off-trail and unmarked, requiring GPS..

The Hardrock 100 is a challenging 100-mile ultramarathon held annually in the San Juan Mountain Range of southwestern Colorado. The race features a counter-clockwise loop course with a total elevation change of about 66,000 feet, including 33,000 feet of ascent and descent, averaging an elevation of..

The Ouray 100 Mile Endurance Run is a challenging ultramarathon set in the breathtaking San Juan Mountain range of Colorado. Participants will face approximately 41,862 feet of elevation gain, making it one of the toughest endurance events. The race features stunning views and demanding climbs, culm..

The Silverton Alpine Marathons, held in Silverton, Colorado, offer trail running adventures through the stunning San Juan Mountains. Participants can choose from three distances: an 8-mile out-and-back, a marathon (~26.8 miles), and a challenging 50K (~31.8 miles). The marathon and 50K courses trave..