Trail Running calendar near Denver 2026-2027

Trail races in Louisville, Colorado offering half marathon, 10 km and 5 km courses on mostly dirt trails with views of the Flat Irons. The event includes aid stations, drop bag access, finish-line support and post-race festivities.

A four-race trail series across city and county parks with increasing distances, chip timed scoring, and series awards for runners who complete all four events.

A late November trail event in Colorado Springs with 50k, half marathon and 10k options across historic High Drive and Gold Camp Road, staffed aid stations, and crew-accessible locations including warm food at Cheyenne Canon.

A four-race trail series across city and county parks with increasing distances, chip timed scoring, and series awards for runners who complete all four events.

Trail running at Staunton State Park with 50k, 16 mile and 8 mile options, 250 runner capacity, and time limits. Courses use varied mountain terrain above 8,000 feet with stocked aid stations and on-site finish awards.

A winter trail running weekend at Cheyenne Mountain State Park near Colorado Springs, featuring timed ultra formats and fixed distance races on multi loop courses with central aid at the loop start and finish.

A long-distance event along the Poudre River Trail on April 11, 2027, offering 50 mile and 100 mile solo and relay options through Fort Collins, Timnath, Windsor and Greeley. The course is supported with aid stations, exchange zones and fin..

Rattler Trail Race in Palmer Park, Colorado Springs on April 17, 2027 offers 5K, 10K, 25K and 50K trail courses through singletrack, sandstone bluffs and city views, with cupless aid stations and measured elevation details for each distance..

Trail races at Greenland Open Space in Larkspur on May 1, 2027, offering 50K, 25K, 8 Mile and 4 Mile loops on dirt and double-track trails with aid stations and a high point near 7,400 feet.

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.

Women focused trail running at Cheyenne Mountain State Park offering distances from 4 Mile to 50K, varied elevation profiles, cupless aid stations with refill points, and packet pickup in Colorado Springs.

Trail races near Fort Collins offering 25 and 50 mile options on mostly singletrack through Lory State Park and Horsetooth Mountain Park, featuring about 5,500 ft or 11,000 ft of vertical gain, staffed aid stations, and marked trails.

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 weekend of obstacle racing at Fort Carson with Sprint, Super, Beast, Ultra and Kids races on steep, high elevation trails. Team entries, spectator access, volunteer options, and discounts for eligible US service personnel are available.