Trail Running calendar near Boulder 2024-2025

The 24 Hours of Palmer Lake is an endurance running event set in the scenic mountains of Palmer Lake, Colorado, featuring a 0.82-mile loop course at an elevation of 7,240 feet. This community-driven race encourages participants to challenge their mental and physical limits, whether competing for dis..

The Bear Chase Race Endurance Festival, taking place at Bear Creek Lake Park in Lakewood, CO, features a variety of trail running events including a 100K, 50 Mile, 50K, Half Marathon, Baby Bear 10K, and 5K. This festival is ideal for both novice and experienced ultramarathoners, offering a mix of ch..

Rocky's Backyard Ultra is an exciting ultra trail running event held at the YMCA of the Rockies in Estes Park, Colorado. Participants must complete a 4.167-mile loop every hour until only one runner remains, who is declared the winner. The course features stunning Rocky Mountain scenery, with approx..

The Great Trailhead Foot Race 10 Miler is an exciting running event held at Bear Creek Lake Park in Lakewood, Colorado. Participants can enjoy a scenic 10-mile course featuring single-track and dirt trails, all while taking in views of Denver's skyline. The event includes a post-race celebration wit..

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 four race distances: 50-Mile, 55k, 15-Mile, and 5-Mile, all set in the scenic landscapes of Sedalia, Colorado. Participants w..

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..