Trail Sisters Women's Half Marathon

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..

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 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..

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 Sheep Mountain trail runs offer three distances: 50-Mile 50k Half Marathon The event is limited to 300 runners and has a 16-hour time limit. The start and finish are at Town of Fairplay Beach in Fairplay, CO. Registration for the 2026 edition opens December 1, 2025; online registration closes..