Trail Running calendar near Glenwood Springs 2026-2027

July 25, 2026 in Grand Mesa, Colorado, offers 50 mile, 55K and 30K trail races across high elevation singletrack with rocky climbs, alpine meadows and lakes. Camping, cash prizes, finisher awards and post race amenities are available.

Mountain Fair 4 Miler in Carbondale follows Prince Creek Road into town with a finish at Sopris Park. Shuttle service to the start is available and proceeds benefit Carbondale Arts.

Annual pack burro race in Fairplay Colorado offering a long mountain course to Mosquito Pass and a shorter wooded loop. Each runner must be paired with a burro and meet specific pack equipment requirements.

A single 200 mile loop around Summit County Colorado across high mountain trails and forest roads, with about 40,000 feet of elevation change, live GPS tracking, 12 aid stations and a small capped field of runners.

STRS #4 - Tom's Baby on July 29, 2026 takes place at Tom's Baby Trailhead in Breckenridge, CO, offering short and long course entries with adult, youth, and non-binary categories and published entry fees.

Experience high elevation trail running in the mountains of Fairplay Colorado. This event offers three distances ranging from a half marathon on forest roads to technical ultramarathons through remote wilderness terrain.

High alpine trail running in Aspen with 50K, marathon and heavy half marathon options and a finish festival at Rio Grande Park.

A steep 4.3 mile uphill trail race from Vail Village to Mid Vail with significant elevation gain, on course aid stations, finish food and age group awards.

A two-day multi-distance run and hike in Snowmass Village offering 3.76k, 5k and a single 10k with an 18.76k challenge and a post-race New Belgium brew.

Trail races of 5K, 10K, and half marathon on Frisco Peninsula trails with lakeshore finishes at Dillon Reservoir on August 8, 2026.

Two day mountain bike and trail running event in Steamboat Springs on August 8 and 9 2026. Multiple distances from a 52 mile solo bike to 26.2 and 13.1 mile runs, with proceeds supporting local youth and trail organizations.

A traditional pack-burro race in Leadville, Colorado at over 10,000 feet where each team is one runner and one burro carrying mining tools. The long course is about 21 miles and a shorter 6 to 8 mile course is planned.

Trail run on August 12, 2026 at Carter Park in Breckenridge offering short and long course entries with adult youth and non binary categories.

Backyard Ultra at Loudy Simpson Park in Craig, Colorado: runners repeat 4.167 mile loops every hour until one runner remains; a single loop Citizens Race is available.

A high-elevation 10K in Leadville on the opening and closing miles of the LT100 Run course, featuring one aid station, age-group awards, and community race-week activities.

A 100-mile out-and-back ultramarathon in Leadville, Colorado with about 15,492 feet of climb, a summit at Hope Pass and 11 on-course aid stations.

A mountain trail half marathon and a mostly downhill 5.6K in Arrowhead, Colorado, featuring shuttle access, multiple aid station stops on the half, awards and postrace refreshments.

Trail races held from the Torian Plum Lawn in Steamboat Springs offering 50k, 16 mile and 5 mile options across high alpine terrain with cupless aid stations, limited crew access, and awards including finisher mugs and age group prizes.

A 5k trail run at Copper Mountain starting at 11,000 feet, held during the Union Peak Festival with music and festival activities afterward.

A 40 mile point to point mountain ultramarathon from Crested Butte to Aspen with over 6,000 feet of elevation gain and mandatory backcountry gear; a fundraiser for Crested Butte Nordic.