Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 145 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 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.
Fourth annual pack burro race at Greenland Open Space in Larkspur, Colorado offering 8 Mile and 3 Mile trail events with strict burro welfare and equipment rules.
October 2026
Trail races of 50K, 28K and 15K at Hartman Rocks near Gunnison CO featuring slickrock, singletrack and wide mountain basin views.
A trail race weekend in Lakewood CO offering distances from 5K to 100K on mostly singletrack dirt trails with aid stations, drop bags, and looped course formats.
Experience the scenic HRCA Backcountry Wilderness Area with trail races for the whole family. Enjoy rolling hills and open views followed by a pancake breakfast and finisher medals for all participants in Littleton.
Fall trail races in Woodland Park, CO featuring 50k and 10k courses around Rampart Reservoir with big Pikes Peak views and well stocked aid stations.
A point-to-point trail marathon and 30K through Colorado’s North Fork Valley with a big climb to Inter-Ocean Pass; all proceeds fund Nature Connection summer camp scholarships.
A last person standing backyard ultra on a 4.17 mile singletrack loop at the 18 Road trail system in Western Colorado, scheduled for October 3, 2026.
Experience scenic road and trail races through the foothills of Canon City with a memorable crossing of the Royal Gorge Bridge.
Experience the scenic single track trails of Steamboat Springs during the Emerald Mountain Trail Run. Choose between the 4 mile or 12k distances through aspen groves to support the local Boys and Girls Club.
Trail festival in Castle Rock offering family adventure and races from a 5K to a 50K across Philip S. Miller Park and Ridgeline Open Space.
A scenic 5K through Estes Park during Elk Fest with shuttle transport from the Visitor Center and a finish at Performance Park.
Trail races in Louisville, CO paired with an Oktoberfest finish, wooden medals, a free pretzel and live Bavarian music.
Experience a self-supported trail race through the Gunnison National Forest with 10 and 19 mile courses starting and ending at Camp 4 Coffee in Crested Butte South.
OUTLAST Denver is a six hour trail challenge where runners complete a 5K every hour, earn patches or a medal for laps, and can place on a national leaderboard.
A memorial ruck and run on October 3, 2026 in Larkspur honoring the WWII Bataan Death March, with proceeds supporting Mt. Carmel Veterans Service Center.
A Halloween themed, dog friendly community event at Koch Park with a timed 5.6K run and a 1 mile walk supporting 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.