Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 135 exciting trail runs across the region. Find your next trail run in Colorado below and join the trail community at these great events!
October 2026
A Halloween themed Aspen event with a timed 3.5 mile trail run and a 1 mile walk that supports the Friends of the Aspen Animal Shelter.
A four-race trail series in Colorado Springs with courses from 3.8 to 7.3 miles, chip timed and awarding gift-card prizes for overall and age-group finishers.
Trail races at Staunton State Park offering roughly 5K, 25K and 50K distances, including a 25K FishSlappers division that requires catching a trout.
A mountain backyard ultra where runners complete a 4.167 mile loop every hour at about 8,000 feet until one person remains; $1,000 for the last runner and buckles at 100 miles.
Trail races in Leadville with a 6.66K bike, a 6.66K run, a nonscary 1.5K kids run, and a costume contest supporting CMC teams.
Cross country meet at Valmont City Park in Boulder offering 1K, 3K and 5K races with age based fees as the first of two fall events.
Run the Rocks is a fundraiser at Red Rocks Park and Amphitheatre on October 11, 2026 offering a 5k and a 1.3 mile run and walk to support lung health in Colorado.
A youth cross country meet at Aurora Sports Park on October 11, 2026 with 2k, 3k, and 4k courses, creek crossings, and awards for the top 10 in each age and gender division.
A dog-friendly 2.5 mile loop on a hilly dirt path in Lone Tree raising funds for the Colorado Animal Care Foundation, with prizes for participating dogs.
Indian Creek Trail Runs in Sedalia, Colorado on October 17, 2026 offers multiple trail and ultra distances through montane forests, aspen groves, red rock formations and prairie vistas with city views from several viewpoints.
Trail races at Palmer Park in Colorado Springs offering 50K, 25K, 10K and 5K on marked single track with aid stations, drop bags, and no pacers.
Trail marathon and half marathon near Fort Collins featuring redstone singletrack, significant elevation change, fully stocked aid stations, and a finish line meal.
Trail races of 5 miles and 10 miles at Bear Creek Lake Park near Denver, with park admission included, post-run food, and a finisher mug for 10 mile finishers.
A 2 mile course at Moon Farm in Fruita where participants carry a pumpkin picked from the patch; pumpkins are included with entry and are weighed and marked beforehand.
A trail event in Durango with about 6.75 miles and 1,500 ft gain that finishes with a community chili cookoff benefiting The Good Food Collective.
A two-day weekend of mountain bike races for women and girls, a family run and on-site camping near Elbert, Colorado with youth and adult categories.
A youth cross-country meet at North Monument Valley Park in Colorado Springs on October 17, 2026 with age-group races from 2 km to 4 km and professional timing.