Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 155 exciting trail runs across the region. Find your next trail run in Colorado below and join the trail community at these great events!
August 2026
A hilly trail 5k at Lory State Park on August 18, 2026 with about 700 feet of elevation gain, a 100-runner cap, chip timing, and pizza and beverages provided after the race.
A four‑date Tuesday evening trail race series in August at Lory State Park near Fort Collins featuring short courses from 5K to 12K with pizza and drinks after each race.
A 200 mile mountain loop in South Fork, Colorado, traversing the La Garita mountains with terrain from pine forest to alpine tundra and highs just under 13,000 feet.
High school cross country meet at Spring Canyon Park on August 21, 2026, featuring a grass and dirt 5k course with proceeds supporting Rocky Mountain High School Cross Country.
A 100 mile high altitude out and back ultramarathon in Leadville with over 15,000 feet of climbing and a 12,500 foot pass on August 22, 2026.
Trail races in Fraser, Colorado featuring a chip timed 13.1 mile half marathon and a 3 mile 5K on dirt roads and trails with aid stations and family friendly policies.
Experience high altitude trail running through the scenic singletrack and historic landmarks of Staunton State Park. Choose between a full or half marathon featuring sweeping mountain views and a festive post-race meal.
Mountain races in the San Juan Mountains around Telluride with five technical routes up to 65 miles and sections above 13,000 ft.
A mountain trail event at Arrowhead on August 22, 2026 offering a 13.3 mile half marathon with 2,844 ft gain and a mostly downhill 5.6K.
Four trail races in Evergreen range from 5K up to a half marathon, with varied meadow and mountain courses, shuttle service at Alderfer, and onsite amenities.
Bayfield XC Invitational in Bayfield Colorado on August 22, 2026 features a citizens 5K plus high school and middle school cross country races.
A four-date midweek trail series at Lory State Park with races from 5k to 12k; the August 25 Eltuck Valley 12k is a mostly flat 12 km course with post-race pizza and beverages.
An evening social hike, run, or ride on Lunch Loop Trailhead in Grand Junction to watch sunset and the full moon, with headlamps and free mini flashlights provided.
Trail races in Steamboat Springs on August 29, 2026 offering 50k, 16 mile and 5 mile courses with high-elevation climbs and a cupless aid station policy.
A community trail event at the Arapahoe County Fairgrounds on 08/29/2026 with a 5K run, a family 5K walk that allows leashed dogs, and a kids 1 mile plus demonstrations, vendors, and a pancake breakfast.
A community running event in Allenspark with a timed 5K, a 2K walk/fun run, dog entries for $5, and proceeds supporting The Old Gallery.
A high altitude 50 mile mountain race in Ouray, CO with 23,582 feet of climbing, mandatory 8 hours volunteer service or $100 opt out, and live SPOT tracking.