Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 146 exciting trail runs across the region. Find your next trail run in Colorado below and join the trail community at these great events!
September 2026
Experience a 26.2 mile mountain run from Manitou Springs to the summit of Pikes Peak and back. This historic event features over 7800 feet of elevation gain and a 10 hour time limit.
Grass cross-country at Exposition Park on Sep 20, 2026 with youth and open races featuring creek crossings, bale jumps, and a wooden footbridge.
Experience the wild spaces of Northern Colorado with a weekend of trail races ranging from a half marathon to a 50 mile ultra through scenic forests and scout camp trails. Stay on site with available camping and community meals.
A multi distance trail and ultramarathon festival on the Rainbow Trail near Westcliffe, Colorado on September 26 and 27, 2026, featuring races from 8 miles to 100 miles, aid stations, drop bags, camping, and defined crew and volunteer rules.
Trail ultramarathons in Crested Butte on September 26, 2026, offering 35K, 55K and 50 Mile courses through high-elevation forest terrain with cupless aid stations.
Experience desert style single track and forest roads with views of the Collegiate Peaks in Buena Vista. Choose between 50k or 30k distances as part of the multi sport 14er Fest.
Tough Mudder Colorado at Fort Carson on September 26, 2026: 15K and 5K routes with 12 to 20+ obstacles, finisher medal, shirt, headband, and Mudder Village spectator pass.
Push your limits on a 0.82 mile loop at 7,240 feet in this community focused 24 hour endurance run in Palmer Lake, Colorado.
Experience two days of mountain endurance in Colorado with technical mountain bike and trail running races including a 50K ultra and the 100K Epic Double challenge.
A high altitude trail half marathon near Telluride on September 26, 2026, covering about 13 miles of mostly singletrack through aspen woods, finishing in town with stocked aid stations and required alpine gear.
Trail trail races around La Veta and Cuchara offering three distances, scenic Spanish Peaks views, and a festival finish at the Cuchara Yacht Club with beer and live music.
A point-to-point half marathon from Fanny Hill in Snowmass along the Government Trail to Koch Lumber Park in downtown Aspen, held each late September.
Experience a point to point trail race from Vail to Minturn with technical singletrack, golden aspen groves, and stunning views of Mount of the Holy Cross.
Experience the changing aspens on a 5K trail run through Breckenridge followed by a festive Oktoberfest celebration at Blue River Plaza.
A cross-country meet at Reservoir Hill in Pagosa Springs with middle school 3K and high school 5K races on hilly forest roads and single-track trails. Ribbons go to the top 10 and team awards for top high school teams.
Run a 12.2 mile trail course that climbs to the mountain summit and back down through the scenic single track of Purgatory Resort.
A six hour trail challenge of repeating a 5K loop each hour; finish all six to earn the OUTLAST medal and a place on the national leaderboard.
Trail races in Pagosa Springs on September 26, 2026 offering 5 km and 10 km on a scenic loop plus a green chile festival afterward.
A high alpine 50K in Nathrop Colorado featuring about 7,000 feet of climb to 13,150 feet, extensive singletrack, staffed aid stations, and an 11 hour cutoff.
Fall trail event in Buena Vista, CO offering a 14K with over 500 feet elevation gain and a 5K through Buena Vista River Park and Vendor Village.