Trail Running Calendar Colorado 2025-2026

The Rim to Rim Royal Gorge Races feature a variety of running events, including a 5K road run, an 8-mile trail run, and a half marathon trail run, all set against the stunning backdrop of the Royal Gorge Bridge in Canon City, Colorado. Participants can enjoy breathtaking views while navigating chall..

Rocky's Backyard Ultra is an exciting ultra trail running event held in Estes Park, Colorado, at the YMCA of the Rockies. This unique race format requires participants to complete a 4.167-mile loop every hour until only one runner remains. The course features stunning Rocky Mountain scenery, with ap..

The Castle Rock Trail Festival is an exciting athletic event that caters to a wide range of participants, from ultra-distance runners to families with children aged 5 to 12. Set against the stunning backdrop of Philip S. Miller Park and Ridgeline Open Space, the festival features various race option..

The Hanging Flume 50K is an ultrarunning trail race set in the scenic landscape of Southwestern Colorado, starting and finishing at the historic Uravan Ballpark. The course features a large loop that primarily follows abandoned mining two-track and desert single-track trails, offering participants s..

The West Elk Challenge is a scenic trail marathon held in the North Fork Valley of Colorado, featuring a challenging 26.2-mile course. Participants start at Crawford Reservoir State Park and traverse through picturesque landscapes, including farms, ranches, and the Gunnison National Forest, culminat..

The Pikes Peak Road Runners Fall Series is a popular cross-country running event featuring four trail races held in various parks around Colorado Springs. Each race presents unique challenges with distances increasing from 3.8 miles to 7.4 miles throughout the series. Participants must be at least 1..

The Sage Burner Trail Race takes place in the scenic Hartman Rocks Recreation Area of Gunnison, Colorado, surrounded by stunning views of the Maroon Bells and San Juan Mountains. This challenging race features a mix of technical slickrock, smooth singletrack, and doubletrack trails, making it a true..

The Blue Sky Trail Marathon and Half Marathon will take place on October 18-19, 2025, in Fort Collins, Colorado. This event features a marathon distance of 26.7 miles with an elevation gain of 3,500 feet, and a half marathon distance of 13.4 miles with an elevation gain of 1,800 feet. The courses tr..

The Indian Creek Trail Runs, part of the Human Potential Running Series, is a celebrated annual event known as the "Fall Classic." Scheduled for October 18, 2025, it features multiple race distances including 50-Mile, 55k, 15-Mile, and 5-Mile courses. Participants will navigate through the scenic tr..

The Great Trailhead Foot Race features both a 10-mile and a 5-mile race set in Bear Creek Lake Park, Lakewood, CO. Participants can enjoy scenic trails while racing, with amenities including free food and beverages post-race, such as hot dogs and non-alcoholic beer. Each runner receives a gender-spe..

The Bobcat Trail Race, taking place in Palmer Park, Colorado Springs, features a variety of distances including 50K, 25K, 10K, and 5K. This event showcases the park's stunning landscapes, offering participants breathtaking views of the city and Pikes Peak. Originally a Mad Moose Event, it has been t..

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 cover as much distance as possible on a scenic, flat one-mile..

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

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 fourth annual event encourages runners of all abilities to enjoy trail running in a fun and community-focused atmosphere. Participants run loops u..

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 scenery, participants can enjoy breathtaking views of the San Juan Mountains and the Colorado N..

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 Sawmill Trail Runs, part of the Human Potential Running Series, is an annual trail running event held at Staunton State Park in Pine, Colorado. The event features three distance options: a 50k, a 16-mile, and an 8-mile race, catering to various skill levels. Known for its scenic and challenging ..