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
A 5 km fundraiser in Telluride supporting the Telluride Adaptive Sports Program. The downtown route climbs the river trail past Bridal Veil Falls and returns to Elks Park, finishing with live music, free beer and yoga.
Multi distance road and trail races around Beulah, Colorado, including a half marathon through Pueblo Mountain Park. Registration is temporarily closed due to the Aspen Acres Fire.
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.
A day of youth and adult cross country races in Aurora, Colorado on September 20, 2026, featuring grass courses with small undulations, a creek crossing, and bale jumps; distances run from 2k youth races up to a 5k open race.
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.
A mountain ultramarathon in Crested Butte, Colorado on September 26, 2026, offered in 35K, 55K and 50 mile distances. Courses run through Gunnison National Forest with single track trails, alpine meadows, cupless aid stations, and on course water dis..
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 features 15K and 5K courses with multiple obstacles, finisher items, volunteer options, and spectator passes.
A 24 hour loop endurance run in Palmer Lake, CO on a 0.82 mile course at 7,240 feet, with distance awards and guaranteed buckles for early 100 mile finishers.
A two-day trail and bike event in Estes Park featuring 31-mile bike and run options, a 15-mile heavy half, and a 62-mile duathlon, with rugged trails, significant climbs, and aid stations supporting competitors.
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 half marathon from Fanny Hill in Snowmass along the Government Trail through aspen groves to Koch Lumber Park in downtown Aspen.
A point to point trail race from Vail to Minturn with 26K and 14K options across Vail Mountain, high alpine singletrack, staffed aid stations and postrace awards.
A three-day Oktoberfest on Main Street in Breckenridge with collectible steins, live music, an Oktoberfest 5K, family Kid Zone and local brews.
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.
A 12 Mile uphill trail race at Purgatory Resort in Durango, Colorado on September 26, 2026. The single track course climbs from the base to the summit and concludes with a post race celebration including food and beer.
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.
A high alpine 50k in Nathrop, Colorado, featuring Colorado Trail singletrack, about 7,000 ft of climb and panoramic Sawatch Range views.