Trail Running calendar near Marble 2026-2027

Six trail races across Summit County, Colorado, in summer 2026. Series registration includes long and short course options with adult, youth, and non binary categories and events at multiple Summit County trail heads.

A mountain trail event in Snowmass Village on June 5-6, 2026 offering a 6.6 mile Red Loop and timed 6 hour and 24 hour ultras, with campground hub, on-site amenities, and 2026 as the final year at Snowmass.

A team trail relay in Snowmass Village on June 5-6, 2026 covering 120 miles total, about 15 miles per runner, with substantial elevation gain, village camping and recreation center amenities. The event is closed.

An evening 5K on Vail Mountain starting and finishing at Nature Valley Mountain Plaza, run as a single mass wave over varied mountain terrain with cupless aid and multiple age categories including nonbinary.

A mountain trail *10K* on Vail Mountain at nearly 9,000 feet with varied terrain, two cupless aid stations and a mass-start format. The race includes multiple age categories from 12+ and a $12,200 prize purse.

A three-day Leadville training camp (June 19-21, 2026) with guided day and night runs, course sections, expert discussions, on-course nutrition, and event swag; minimum age 17 and general registration is sold out.

San Juan Solstice 50 Mile Run on June 20, 2026 uses MAProgress live tracking; entry was by lottery with 300 registered and 285 on the waitlist. All runners must carry a registered tracker which can be owned, borrowed, or rented.

A trail run at Creekside Park on June 20, 2026 offering 10K and 5.2K courses as part of the Vail Trail Running Series; the race benefits the Vail Valley Charitable Fund and features aid stations, finish-line food, awards, and on-site maps.

Four Colorado mountain events include four half marathons and a 25K across June to September 2026, totaling 67.9 miles. The series is coordinated by HAL Sports with nonprofit organizers supporting local youth programs.

At 10,600 feet in Alma, Colorado, Race in the Clouds is a June 25 to 28 Dirt Fest featuring mountain biking, trail running, off road duathlon, youth races and meadow camping, with USA Triathlon sanctioning and age group awards.

A 26.4 mile trail marathon and a 15.46 mile Heavy Half on Leadville mining trails, topping out at Mosquito Pass 13,185 feet. Both races feature multiple aid stations, specified parking and shuttle arrangements, and the marathon serves as an..

A three race trail series at Sunlight Mountain Resort near Glenwood Springs, Colorado. It offers 5K, 10K, and a half marathon with specified elevation gains, limited aid station support, and defined registration windows.

A Fourth of July 5K in downtown Leadville, CO, held above 10,000 feet. Proceeds support local youth athletics and youth entries are free.

A historic uphill trail race on Vail Mountain covering about 12.2K (7.6 miles) with 2,128 ft of gain, three aid stations, on-course hydration and a Mid-Vail finish with awards by age group.

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.

Experience Crested Butte’s oldest trail challenge with running and mountain biking events. Choose between a 25 km loop or the classic 15 km sprint in this high elevation mountain competition.

A high-altitude, approximately 50-mile out-and-back trail run around Leadville with about 7,500 feet of elevation gain, marked aid stations, drop-bag service, shuttle-required parking, and LT100 qualification opportunities.

Experience the STRS Horseshoe Gulch Grind in Breckenridge with short and long course options. This trail event offers categories for adults and youth starting from the Blair Witch Trailhead.

A 100-mile trail race in Ouray, Colorado, with about 41,862 feet of elevation gain across fourteen climbs and a 52-hour cutoff. Runners must complete eight hours of volunteer service or pay a $100 opt-out fee; winners face drug testing and..

Experience a high altitude mountain race through the Sawatch range of the Colorado Rockies. This 101 mile loop features historical ghost towns and alpine passes with over 23000 feet of elevation gain.