Trail Running calendar near Marble 2026-2027

A high altitude trail running event in Como and Grant, Colorado offering ultras and shorter trail distances across alpine meadows, single track and historic mining terrain, with aid stations, drop bag options, crew and pacer rules.

A trail event at the Crested Butte Nordic Center featuring a 15 km out and back run, a 25 km loop run, and a technical 25 km mountain bike race with alpine climbs and a Green Lake checkpoint.

A series of Leadville trail races on July 11, 2026, highlighted by a 50-mile out-and-back with 8,000 feet of gain, organized aid stations, and a spot as a qualifier for the Leadville Trail 100 Run; 15-mile and juniors 5K distances are also..

The STRS Horseshoe Gulch Grind will take place in Breckenridge on Wednesday 15 July 2026.

A 100 mile loop through Colorado's Sawatch Range, the High Lonesome 100 covers about 23,300 feet of climb, includes 27 miles of the Continental Divide Trail and 35 miles of the Colorado Trail, and provides detailed maps and aid stations.

A three day 120 miles trail running event near Buena Vista Colorado using charity bibs that require a minimum $2,000 fundraising commitment. Successful fundraisers receive a registration code and donations are final and distributed in Decem..

A mountain trail run at Powderhorn Mountain Resort on July 18, 2026 offering 5K and 15K options along the Stagecoach Trail, significant elevation gain, resort entry, a lift pass, and post-race amenities.

A trail running event on July 18, 2026 offering 10K, 25K and 50K courses across the four Aspen Snowmass mountains. Courses include the Government Trail and sections of singletrack and dirt road.

A mountain trail event on July 18, 2026 featuring 10K and 5K courses on Vail Mountain. Courses were rerouted for 2026 and include aid stations, high-altitude terrain, age-group awards, and post-race refreshments.

Grand Mesa Ultras on July 25, 2026 in Grand Mesa, Colorado offers 50 Miler, 55K and 30K trail races across high alpine terrain with camping, awards, a post race raffle, and on site food and beer.

A combined national high school trail championship and a citizens race on the Salida Mountain Trails in Salida, Colorado on July 25, 2026. The 5.4 mile singletrack course includes steep climbs, switchbacks and a high point near 7,558 ft.

A community 4 mile road run in Carbondale tied to the Mountain Fair, finishing at Sopris Park. Entry fee is $40 with free youth entry and proceeds benefiting Carbondale Arts.

Experience a historic Colorado tradition where runners and burros compete together. Navigate mountain trails and high altitude passes while carrying traditional mining gear in this unique world championship event.

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.

Sheep Mountain Trail Runs in Fairplay, CO offers 50 mile, 50k and half marathon courses at high elevation with technical trails and forest roads. The event includes stocked aid stations, a finisher medal, drop down options and a 16 hour tim..

Trail races in Aspen on August 1, 2026, offer 50K, marathon and heavy half-marathon courses on mostly dirt trails with significant elevation gain, limited aid, and a finish-line festival at Rio Grande Park coinciding with the Duck Derby.

A mountain trail race from Vail Village to Mid-Vail covering about 6.9 km with roughly 2,013 feet of ascent, staffed aid stations and finish refreshments. Age-group awards and race t-shirts are provided.

A pack burro race in Buena Vista Colorado on Aug 2 2026 with 13.1 mile and 7.3 mile courses offered both with and without burros. Burro teams must meet specific equipment and conduct rules and finishers receive a gift and a meal.

A self-directed 100 mile challenge from Lake City, CO that requires visiting 24 ordered proof points and checkpoints. The route is unmarked and unsupported, has about 40,000 feet of elevation gain, and a 48 hour cutoff.