Trail Running calendar near South Fork 2025-2026

The High Lonesome 100 is a challenging 100-mile trail ultramarathon held in the Sawatch Range of the Colorado Rocky Mountains, starting and finishing near Mount Princeton. The loop course features 23,500 feet of elevation gain, reaching a high point of 13,100 feet and averaging 10,600 feet in elevat..

The Ouray 100 Mile Endurance Run is a challenging ultramarathon held in Ouray, Colorado, nestled in the scenic San Juan Mountains. Covering 100 miles with an elevation gain of approximately 41,862 feet, the course features fourteen significant climbs, including a final 5,000-foot ascent to the Bridg..

The Silverton Alpine Marathons, held in Silverton, Colorado, offer runners a challenging and scenic trail experience in the San Juan Mountains. Participants can choose from three distances: an 8-mile out-and-back, a marathon (~26.7 miles), and a 50K (~31.8 miles). The marathon and 50K courses follow..

The Kendall Mountain Run is a challenging mountain race held annually in Silverton, Colorado. It features two distances: a 12-mile course and an 11K, both starting in downtown Silverton at 9,318 feet elevation. The 12-mile race ascends jeep roads to a thrilling final scramble to the summit of Kendal..

The Creede 100 is a challenging 100-mile ultramarathon held in Creede, Colorado, a historic mining town. The race features a scenic and rugged course through the San Juan Mountains, climbing above 12,000 feet and traversing the Continental Divide for 25 miles. Runners experience breathtaking views,..

The Box Canyon Trail Races in Telluride, Colorado, offer two challenging and scenic mountain runs: a 30K and a 10-mile race. The 30K is a tough loop featuring about 5,800 feet of elevation gain, passing landmarks like Bridal Veil Falls, the Smuggler-Union Hydroelectric Plant, and reaching a high poi..

The High Five 100 is an extreme ultra-endurance running challenge held in Lake City, Colorado. Covering an estimated 90 to 105 miles with over 40,000 feet of elevation gain, the course requires runners to summit five 14,000-foot peaks and six 13,000-foot peaks in the rugged San Juan Mountains. Parti..

The San Juan Softie 100 is a challenging 100-mile ultramarathon held in Durango, Colorado, traversing the scenic San Juan Mountains. The course features an average elevation near 10,000 feet and includes over 20,000 feet of vertical gain, making it a demanding mountain race. Participants experience..

The Rio Grande 100 is an ultramarathon held in South Fork, Colorado, starting and finishing along the Rio Grande River. The challenging 100-mile course traverses the La Garita Mountains, featuring diverse terrain from arid forests to alpine tundra, with runners crossing elevations above 12,000 feet..

The Telluride Mountain Run, held in Telluride, Colorado, is a demanding mountain race set in the San Juan Mountains. It offers three challenging distances: 40 miles, 24 miles, and 13 miles. The course features old mining roads, singletrack trails, alpine tundra, exposed ridgelines, and high summits,..

The Creede Mountain Run, held in Creede, Colorado, is a challenging mountain race established in 1987 that celebrates the transition from summer to fall. Set in the scenic San Juan Mountains, it offers four race distances: 2 miles, 12 miles, 22 miles, and a 50K ultra. The courses start in the histor..

The Sneffels Round is a challenging mountaineering event held near Ouray, Colorado, with a 100-hour time limit. Participants choose their own routes to summit a selection of peaks from a map featuring 39 mountains, including many 13ers and the 14,150-foot Mt. Sneffels.The course covers roughly 75 mi..

The Imogene Pass Run will take place in Telluride on Saturday 6 September 2025.

The Ouray 50 Mile Endurance Run, held in Ouray, Colorado, is a challenging mountain ultramarathon featuring 50 miles of highly technical trails with an elevation gain of 23,582 feet. Set nearly two miles above sea level, the course offers stunning mountain scenery and is known for being tougher than..

Blisters & Brews is a 5k fundraiser race held in Telluride, designed for attendees of the Telluride Blues & Brews Festival to enjoy a morning of exercise before the festivities begin. The event supports the Telluride Adaptive Sports Program and features a scenic route that includes views of Bridal V..

The Ouray Mountain Trail Run is a challenging 13-mile race held in the scenic mountains of Ouray, Colorado, starting and finishing at Fellin Park. This event offers runners stunning views and a rewarding mountain trail experience. It serves as a fundraiser for the Ouray School, supporting educationa..

The Mountain Marmot Trail Run, presented by Durango Running Company, is a challenging 12-mile trail race held at Purgatory Resort in Durango, Colorado. The course features a steady climb of about 1,800 feet from the base to the top of Lift 8, followed by a downhill return, offering stunning views of..

The Sangre de Cristo Trail Festival, hosted by the Human Potential Running Series, is a premier trail running event held near Westcliffe, Colorado, at Music Meadows Ranch adjacent to the Grape Creek Trailhead. Set in the rugged Sangre de Cristo Mountains along the scenic Rainbow Trail, the festival..

The Deep Creek Trail Half Marathon is a scenic 13-mile trail race held near Telluride, Colorado. Starting at the Telluride Airport on Last Dollar Road, runners descend to Deep Creek Corral before entering singletrack trails through aspen-filled woods along Deep Creek. The course offers a mostly sing..

The Sage Burner Trail Race takes place in Gunnison, Colorado, within the scenic Hartman Rocks Recreation Area near Black Canyon National Park. This fall event offers three distances: 50K, 28K, and 15K, featuring a challenging course with technical slickrock, smooth singletrack, and fast doubletrack..