Trail Running calendar near Glenwood Springs 2026-2027

A single 200-mile loop around Summit County, Colorado on trails, 4WD roads and rec paths, with elevations above 9,000 ft and sections over 12,700 ft. The field is capped at 75 runners and includes 12 aid stations, four sleep stations, and l..

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.

Trail races in Aspen on August 1, 2026 offering 50K, marathon and heavy half marathon on dirt trails with substantial elevation gain. The event finishes at Rio Grande Park the same day as the Duck Derby festival with music and food.

A mountain trail race in Vail on August 1, 2026 featuring an uphill 6.9 km course with about 2,013 feet of gain, singletrack and doubletrack terrain, an aid station, post race refreshments, awards and a raffle.

A two day running event in Snowmass Village on August 7 and 8, 2026 offering 3.76k, 5k and a single 10k plus an 18.76k challenge. Finishers receive a free New Belgium brew and event medals; proceeds support local nonprofits.

Trail races of 5k, 10k and half marathon on Frisco Peninsula trails with lake and mountain views, single-track sections, chip timing, aid stations, and post-race food and beer for participants 21 and older.

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 at 10,200 ft in Leadville, Colorado on August 9, 2026. Teams of a runner and a burro follow marked mountain routes over historic mining trails with long and shorter course options and strict animal welfare rule..

STRS #5 Carter Park Scurry in Breckenridge on August 12 2026 offers short and long course entries across adult youth and non-binary divisions with published entry fees and a course map.

A community Backyard Ultra at Loudy Simpson Park in Craig, Colorado, with repeated 4.167 mile loops each hour until one runner remains. A single loop Citizens Race uses the same riverside course for a shorter experience.

The Leadville Trail 10K Run on August 16, 2026 is a 10 km out and back that uses the opening and closing sections of the LT100 Run course at high elevation, with one aid station at the turnaround and age group and overall awards.

A 100 mile out and back ultramarathon in the Colorado Rockies on August 22, 2026, featuring roughly 15,492 feet of elevation gain and a peak near 12,500 feet at Hope Pass. The route has 11 aid stations, designated crew access points, and be..

Trail races in Arrowhead, Colorado on August 22, 2026 include a 13.3 mile half marathon with 2,844 ft of climbing and a mostly downhill 5.6K. Courses run mostly on single track and finish at Arrowhead Village with awards and post race food.

A mountain trail race in Steamboat Springs on August 29, 2026 offering 50k, 16 mile and 5 mile courses from Torian Plum Lawn. The event is cupless, donates proceeds to trail maintenance, and includes aid stations on the longer distances.

A 40 mile point to point mountain ultramarathon from Crested Butte to Aspen across the Elk Mountains with over 6,000 feet of climb, organized as a fundraiser for Crested Butte Nordic and requiring specific backcountry gear.

A mountain trail race at Arapahoe Basin on September 5, 2026 covering 9.4 miles and 2,211 ft of vertical. The marked course uses established trails in White River National Forest and finishes in Mountain Goat Plaza with live music and food.

Experience a high altitude trail run starting at 10,000 feet on Rabbit Ears Pass. Runners navigate a mix of forest roads and single track trails with 1,200 feet of elevation change through scenic Colorado terrain.

A trail race on Meadow Mountain in Minturn, Colorado offering an 11K and a 5K route across singletrack and meadows with stream crossings, scenic mountain views, on-course aid stations, and finish-line t-shirts and refreshments.

A fall mountain event on September 13, 2026 featuring a 25K loop past Crystal Mill, an 8 mile Quarry Climb, and a 2.5K kids run, with a post-race BBQ and proceeds benefiting Marble Charter School.