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!
March 2027
A March snowshoe and running event at Vail Nordic Center with 4K and 8K courses, a free kids fun run, aid stations, and a post-race gathering in the Gore Range Room.
April 2027
A backyard ultra at Greenland Open Space in Larkspur, CO, run as repeated 4.167 mile (6.706 km) loops until one runner completes a final solo loop and wins.
Three days of trail races in Fruita, Colorado with four distances, desert singletrack views, and qualifying opportunities for UTMB World Series and Western States.
Trail races in Highlands Ranch on April 10, 2027 offering 21 mile, half marathon, 10 km and 5 km courses on mostly dirt single-track with rolling hills.
A culturally rooted trail run and hike in Boulder offering distances from 5K to marathon, with free youth admission and programming by Americas for Conservation, Health & the Arts.
Long-distance races on April 11, 2027 along the Poudre River Trail from Bellvue to Greeley with 50 and 100 mile solo and relay options.
Rattler Trail Race in Palmer Park, Colorado Springs on April 17, 2027 offers 5K, 10K, 25K and a 50K two loop course on singletrack with sandstone bluffs, technical sections and views of the city and Pikes Peak.
May 2027
Trail races at Greenland Open Space near Larkspur offer four dirt-trail distances with looped courses, aid stations, timing, and awards.
A road and trail running event in Garden of the Gods Park on May 1, 2027 offering 5K, 5 mile, and a 9.5 mile option with closed roads, multiple aid stations, and views of the park's iconic rock formations.
Invitation-only Colorado endurance event on May 1, 2027 with a 40-person field, unpublished course, heavy off-trail navigation, minimal aid, and mandatory map and compass skills.
Trail race in Buena Vista, Colorado on May 1, 2027 featuring 25 miles and 50 miles looped courses that run near the Arkansas River.
A 150 hour timed ultra in Mack, Colorado with five off road routes, crewed and uncrewed divisions, and required GPX navigation.
A women focused trail running event at Cheyenne Mountain State Park on May 8, 2027 offering distances from 4 mile to 50K across limestone, singletrack and ridgelines, with cupless aid stations and race packet pickup the day before.
A chip-timed 5k at Colterris Winery in Palisade, Colorado, with a two-lap cross country course, race swag including a collapsible wine glass and finisher medal, and a charity partnership with RiversEdge West.
A weekend of backcountry racing in the North Fruita Desert featuring a 55K ultramarathon and a 13.8 mile trail half marathon on the 18 Road trails with event camping.
Trail races near Fort Collins with two distances: 25 miles (~5,500 ft gain) or 50 miles (~11,000 ft gain) on mostly singletrack through Lory State Park and Horsetooth.
Trail races at Mueller State Park from 10k to marathon plus two 12 hour timed events that use colored ball draws to set loop sequences. All courses are single and double track with no pavement and feature an aid station.
A 14 miles loop around Vallecito Lake in Colorado with mixed surfaces, cupless aid stations, free race photos and a post race lunch with live music while proceeds support local nonprofits.