Trail Running calendar near Aspen 2025-2026

Crested Butte Ultra, in Crested Butte, Colorado, features 50 Miler, 55K, and 35K formats. Runners traverse the Gunnison National Forest on single-track trails through mountain meadows and up to high ridges for wide-open vistas of wildflowers, mountain backdrops, and fall foliage. The event aims to f..

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring two race distances: a 50K (30.6 miles) with 4,000 feet of ascent and a 30K (18.1 miles) with 2,080 feet of ascent. The courses traverse buttery singletrack trails, forest roads, and some paved sections, set..

Golden Leaf Half Marathon, presented by ACG, is the bucket-list race hosted by the Ute Mountaineer and the City of Aspen. The half marathon (approximately 13.1 miles) starts at Fanny Hill in Snowmass and follows the Government Trail through scenic Aspen groves, finishing at Koch Lumber Park in downt..

The Sawatch Ascent 50k is a challenging high-alpine trail race held in Nathrop, Colorado, showcasing the stunning Sawatch Range. Covering 33 miles with 7,000 feet of vertical gain, the course features a mix of 26 miles of singletrack, paved, and gravel roads, including 12 miles on the Colorado Trail..

14er Fest is a fall trail-running event in Buena Vista, Colorado, featuring two races: an 8.7-mile (14K) course and a 3.1-mile (5K) course. The 14K starts in Buena Vista River Park, crosses the Arkansas River, and climbs the Midland Hill Trail System for over 500 feet of elevation gain, offering pan..

The West Elk Challenge Trail Marathon takes place on October 4, 2025, in the North Fork Valley of Colorado. It is a point-to-point trail race that starts at Crawford Reservoir State Park and finishes in the town of Paonia along the North Fork of the Gunnison River. The event is a fundraiser for the..

Rubey Rescue Run is a 5K uphill trail race held in Aspen, Colorado. The course climbs Buttermilk Mountain, starting near the base at Buttermilk Mountain Lodge and gaining about 1,700 feet to the Cliff House, offering a timed competition and sweeping views of the Maroon Bells. Participants may run wi..

Sage Burner Trail Race is held at Hartman Rocks Recreation Area in Gunnison, Colorado. The event date is Saturday, October 11, 2025. Distances offered include: 50K 28K 15K The event location features high desert terrain with sage brush and 360 degree views of the Maroon Bells, the San Juan Mounta..

USCSA Cross Country Ski Racing Festival, hosted by Colorado Mesa University at Snow Mountain Ranch Nordic Center in Granby, Colorado, on January 24–25, 2026, brings collegiate teams together with junior skiers for a two-day Nordic festival. Races include a 15 km classic (collegiate and independent h..

Gothic Mountain Tour takes place in Crested Butte, Colorado. It features two ski races: a 23.5-mile competitive course and a 17.85-mile recreational route around Gothic Mountain, finishing on the Crested Butte Nordic trail system at the Magic Meadows Yurt. The course begins in Crested Butte (competi..

The 21st Annual Run Through Time Trail Marathon and Half Marathon takes place in Salida, Colorado. It offers a Trail Marathon, a Trail Half Marathon, and a 2 Mile Run, plus a free kids’ 400-meter dash in Riverside Park. Courses run on the Arkansas Hills Trail System—dirt/jeep roads and narrow, hilly..

Race The Ranch is a snowshoe race held at the Snow Mountain Ranch YMCA property in Granby, Colorado on April 4, 2026. The event offers three distances: 50k 25k 5k The 50k route uses less-known trails on the property and includes Pete's Loop. Course maps and stated elevation gains are: 5k one lap..

Summits Trail Runs, the 2nd Annual edition of the Human Potential Running Series, unfolds at Granby Ranch Resort in Colorado’s Rocky Mountains (Granby, CO). The race weekend offers several distances: Elevation Challenge (a 32-hour ascent loop on East Peak), 50k, Marathon, Half Marathon, and 6 Miles,..

The Race in the Clouds - Alma Dirt Festival is a multi-sport outdoor event held in Alma, Colorado in 2026. The festival base is Alma Cemetery Meadow, at about 10,600 ft elevation and roughly half a mile from downtown Alma. The event program includes mountain biking, trail running, an off-road duath..

The Silverheels Trail Runs take place July 10-11, 2026, with start/finish operations based at the Como Roundhouse in Como, CO. Distances offered include: 100-Mile 100k 50-Mile 60k 19-Mile 10-Mile Runner capacity is limited: 100 combined for the 100-Mile and 100k, and 200 combined for the 50-Mile,..

TransRockies Run is a three-day, two-distance trail-running stage race across the Colorado Rockies. The route traverses the continental divide between Hope Pass and Red Cliff, Colorado, totaling 51 miles for The Full Pint (about 9,635 ft of vertical gain) and 35 miles for The Half Pint (about 6,855..

The Summit 200 is a single, non-repetitive 200‑mile loop around Summit County, Colorado, centered near Frisco. The mostly non-urban route uses single-track trails, forest roads, and some rec paths and pavement, with the lowest altitude above 9,000 ft and sections climbing toward 12,800 ft, plus 12 f..

The Sheep Mountain Trail Runs is the 12th annual event held in Fairplay, Colorado, with the Start/Finish at the Town of Fairplay Beach. The race has a runner capacity of 300 and a time limit of 16 hours. The course sits at an average elevation over 10,600 ft and takes place on the western slope of..

Run the Rockies Trail Race in Frisco, Colorado offers 5k, 10k, and half marathon distances on the scenic Frisco Peninsula trails, with views of Dillon Reservoir and the Ten Mile Range. The start and finish are at the Frisco Nordic Center. The course blends single-track and dirt roads, looping counte..