Trail Running calendar near Glenwood Springs 2026-2027

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.

Sheep Mountain Trail Runs in Fairplay Colorado features 50 mile, 50K and Half Marathon courses on high‑elevation mountain trails with maps, aid stations, and midrace drop options.

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.

The Cirque Series at Arapahoe Basin on Sept 5, 2026 is a 9.4 miles mountain trail race with 2,211 ft of ascent on approved White River National Forest trails. The field is capped at 600 runners and includes a branded hat, bib and medal.

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.

Trail races on Meadow Mountain in Minturn offering 11K and 5K courses on singletrack and dirt trail, with aid stations, post-race refreshments, and series awards.