Trail Running Calendar Colorado 2025-2026

The Colorado 24 Hour Run is an exciting endurance event taking place in Fort Collins, Colorado, featuring various race formats including 24-hour, 12-hour, and 6-hour runs, as well as relay options. Participants can challenge themselves to see how far they can run within their chosen time frame on a..

The Bingo! Trail Party is an annual trail running event held at May Farms in Byers, Colorado. Designed as a fun, community-focused "Trail Party," it offers runners of all abilities a unique challenge where participants run loops until they achieve a bingo on their bib by drawing numbered chips after..

The Kessel Run Ultra, held in Fruita, Colorado, offers a range of distances including 10 miles, 20 miles, 50k, 40 miles, and 50 miles. This trail running event features world-class singletrack trails renowned for their fast, flowing terrain and challenging steep sections, particularly on the Zippity..

The HRCA Backcountry Wilderness Half Marathon is an annual trail race held in Highlands Ranch, Colorado, featuring a challenging 13.1-mile course that showcases stunning landscapes. Participants navigate through dirt, gravel, and singletrack paths, with opportunities to encounter local wildlife. The..

The Louisville Trail Race, held annually in Louisville, Colorado, features a half marathon, 10K, and 5K on scenic front range trails with the iconic Flat Irons as a backdrop. The courses are mostly dirt trails with some bike path sections, offering a mostly flat terrain with challenging hills that p..

The Colorado Cold Rush Ultra is a winter trail running event held in Colorado Springs, featuring distances of 50K, half marathon, and 10K. The race courses showcase diverse terrains and stunning views, including historic High Drive and the tunnels from the Colorado gold rush era. The 50K starts at B..

The Thumbs Up Vertical Challenge is an 8-hour ascent race held in Estes Park, Colorado, on the Thumb Open Space trail. Participants run a 1 km out-and-back course with a steep 540-foot elevation gain per ascent. Runners collect poker chips at the turnaround point to track their completed ascents, wh..

The Sawmill Trail Runs, part of the Human Potential Running Series, is an annual trail running event held at Staunton State Park in Pine, Colorado. Offering 50k, 16-mile, and 8-mile distances, the race features a scenic and challenging course through diverse terrain ranging from high grassy meadows..

The USCSA Cross Country Ski Racing Festival, held at Snow Mountain Ranch Nordic Center in Granby, Colorado, is a vibrant collegiate and junior skiing event scheduled for January 24-25, 2026. It features classic races of 15 km and 7.5 km for college and independent high school athletes, alongside CHS..

Stories Trail Runs is an annual winter trail running event held at Cheyenne Mountain State Park in Colorado Springs, Colorado, offering stunning views of Cheyenne Mountain and Pike’s Peak. The event features multiple race options including timed 30-hour, 15-hour, and 6-hour ultras, as well as shorte..

The Winter's End Snowshoe Races, held at Granby Ranch Resort in Granby, Colorado, offer a unique winter running experience on mostly groomed single and double-track trails. The event features multiple distances including a marathon, 14-mile, 7-mile, and 5k races, accommodating runners of all skill l..

The 21st Annual Run Through Time Trail Marathon and Half Marathon takes place in Salida, Colorado, featuring challenging courses on dirt roads, jeep trails, and narrow, hilly single tracks with stunning views of Salida and the Arkansas Valley. Elevations range from 7,000 to 9,000 feet. The event inc..

The Desert Rats Trail Running Festival will take place in Fruita from Friday 10 April 2026 to Sunday 12 April 2026. You can run between 9 and 100 kilometers.

The Rattler Trail Race, held in Colorado Springs at Palmer Park, offers runners a chance to experience scenic singletrack trails with panoramic city views and sights of Pikes Peak. The event features multiple distances: 50K, 25K, 10K, and 5K, catering to various skill levels. The course is known for..

The Greenland Trail Races take place annually in May at Greenland Open Space in Larkspur, Colorado. Offering four distances—4 miles, 8 miles, 25K, and the state's fastest 50K—the event features a scenic course through over 3,000 acres of native grasslands, ponds, oak hills, and ponderosa pine forest..