Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 150 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
Two trail ultramarathons in Steamboat Springs covering 50 and 100 mile courses across Buffalo Pass, Mount Werner, and Rabbit Ears with a $100,000 purse and community giving.
Experience a 13 mile trail run with 4180 feet of elevation gain through the scenic San Juan Mountains to support outdoor education for local students.
Experience the scenic mesa trails of North Table Mountain in Golden with 5 or 10 mile races that support families working to overcome homelessness.
A 13.32 mile ascent from Manitou Springs to the summit of Pikes Peak with about 7,867 ft of elevation gain on September 19, 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.
Community 5K and 10K races in Beulah Valley with paved and short dirt sections; 20% of proceeds support recovery after the Aspen Acres Fire.
Community 5K, 1 mile fun run and a dog friendly 3.1 mile course on Second Creek Trail supporting Every Child Pediatrics in Commerce City on 09/19/2026.
Pack burro race in Frederick Colorado during Miners Day featuring a town-to-park course that loops Milavec Lake and finishes at Centennial Park.
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.