Trail Running calendar near Castle Rock 2025-2026

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring 30K and 50K races. Set against the stunning backdrop of the Collegiate Peaks, participants can enjoy a mix of singletrack and forest roads, with significant elevation gain. This event caters to all levels o..

The Sawatch Ascent is a challenging 50k trail race set in the stunning Colorado mountains, taking place on September 28, 2025. Starting and finishing at the base of Mount Princeton, participants will experience a significant elevation gain of 7,000 feet, reaching a high point of 13,150 feet. The cou..

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, also known as the liveBIG Run, invites participants to challenge themselves on the scenic trails of Philip S. Miller Park and Ridgeline Open Space. This event caters to a wide range of athletes, offering various race options including a 5K, 10K, half marathon, and a 5..

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 challenging courses with breathtaking vie..

The Bear Chase Race is an endurance festival held at Bear Creek Lake Park in Lakewood, Colorado, featuring a variety of race distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K. This event is ideal for both novice and experienced trail runners, offering a mix of challenging terrain an..

The Above the Clouds Ultra is an annual running event held in Woodland Park, Colorado, featuring 50k and 10k races. Set against the stunning backdrop of Pikes Peak, participants experience the vibrant fall colors and scenic trails of Rampart Reservoir. The course begins in the "City Above the Clouds..

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 Great Trailhead Foot Race features both a 10-mile and a 5-mile race, set against the scenic backdrop of Bear Creek Lake Park in Lakewood, Colorado. Participants can enjoy a mix of single-track and dirt trails while racing. Registration includes park admission, a post-race party with complimentar..

The Indian Creek Trail Runs, part of the Human Potential Running Series, is a celebrated annual event known as the "Fall Classic." Set in Sedalia, Colorado, this race showcases stunning single-track trails through diverse montane ecosystems, featuring vibrant autumn colors. Participants can choose f..

The Bobcat Trail Race is an exciting running event held in Palmer Park, Colorado Springs, showcasing the park's stunning natural beauty. Participants can choose from four distances: 50K, 25K, 10K, and 5K, each offering unique challenges and breathtaking views of the city and Pikes Peak. The event, o..

The Beware The Bear Trail Races, held at Bear Creek Lake Park in Lakewood, CO, offers a variety of race options including a 5km, 15km, and a kids' 1km run. The courses feature mostly dirt trails with a mix of steep hills and rolling terrain, making it suitable for both beginners and experienced trai..

The Bridge Burner Ultra is an exciting running event taking place in Canon City, Colorado, featuring a scenic 35-mile loop and additional distances of 50k, 35k, and 10k. The race begins along the picturesque Arkansas River and includes a challenging ascent to 7,109 feet, offering breathtaking views..

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 one-mile dirt..

The Bingo! Trail Party is an engaging running event organized by the Human Potential Running Series, set to take place at May Farms in Byers, Colorado. This unique trail party encourages runners of all abilities to enjoy a fun and stress-free environment while competing for a Bingo on their bibs. Pa..

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 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 taking place in Colorado Springs, featuring a scenic course along historic High Drive and through the tunnels of the Colorado gold rush. Participants can choose from three race distances: 50K, Half Marathon, and 10K, all set against the s..

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 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. With a runner capacity of 250, the ev..