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 a unique running event organized by the Human Potential Running Series, set to take place at May Farms in Byers, Colorado. This event encourages community participation and offers various distance levels ranging from 6 to 54 miles. Runners aim to achieve a "Bingo" by comple..

The Kessel Run Ultra, taking place in Fruita, Colorado, offers an exciting trail running experience with various distances including 50 Miler, 40 Miler, 50k, 20 Miler, and 10 Miler. Known for its stunning singletrack trails, participants can enjoy breathtaking views of the San Juan Mountains and the..

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, celebrating its 12th year, features a Half Marathon, 10K, and 5K, set against the stunning backdrop of Louisville, Colorado. Known for its scenic trails and welcoming atmosphere, the race offers a mostly flat course with a challenging hill that rewards runners with breatht..

The Colorado Cold Rush Ultra is a unique winter running event held in Colorado Springs, featuring a scenic course that showcases the historic High Drive and the tunnels from the Colorado gold rush era. Participants can choose from three distances: a 50k, half marathon, and 10k, all set against the s..

The Sawmill Trail Runs, organized by the Human Potential Running Series, is set to take place at Staunton State Park in Pine, Colorado. This annual event features three race distances: 8-Mile, 16-Mile, and 50k, catering to a variety of trail running enthusiasts. The park offers stunning scenery, wit..

The Thumbs Up Vertical Challenge is an exciting running event taking place in Estes Park, CO, featuring an 8-hour ascent on the Thumb Open Space trail. Participants will navigate a 1km out-and-back course with a 540ft elevation gain, collecting poker chips at the turnaround to determine their standi..

The USCSA Cross Country Ski Racing Festival, hosted by Colorado Mesa University, is an exciting event taking place at Snow Mountain Ranch Nordic Center in Granby, Colorado. Scheduled for January 24-25, 2026, the festival features competitive races for collegiate and junior athletes, including 15K an..

The Stories Trail Runs is an annual winter trail running event held in Colorado Springs, CO, featuring a stunning backdrop of Cheyenne Mountain and Pike’s Peak. Participants can choose from various timed events, including 15-hour, 30-hour, and 6-hour challenges, as well as shorter distances like a 1..

The Winter's End Snowshoe Races, held at Granby Ranch Resort in Granby, Colorado, is an exciting winter running event that welcomes participants of all skill levels. Scheduled for March 7, 2026, the event features multiple race distances, including a marathon, 14-mile, 7-mile, and 5k, all set agains..