Trail Running calendar near Castle Rock 2025-2026

The American Heroes Run, held in Longmont, Colorado, is a patriotic running event commemorating the events of 9/11. It features a variety of distances including a 100-mile ultra with a 30-hour cutoff, a 24-hour run, marathon, half-marathon, 9.11-mile, and 5K races. The course is a flat, fast 1.05-mi..

The Cirque Series at Arapahoe Basin, Colorado, is a challenging mountain trail race held on September 6, 2025. Covering approximately 9.4 miles with 2,411 feet of vertical gain, the course starts at 10,780 feet at Mountain Goat Plaza and ascends through scenic trails including the A-Basin summer roa..

The HRCA Wildcat Mountain Trail Races take place in Littleton, Colorado, starting at the Douglas County East/West trailhead near Rocky Heights Middle School. The event features 10K and 10-mile trail races along the scenic HRCA Backcountry Wilderness Area Wildcat Mountain trail system, offering 100%..

Devil on the Divide is a challenging trail running event held in Empire, Colorado, featuring 50K and 22K point-to-point courses. Set against the stunning backdrop of Clear Creek County and the Continental Divide, the race offers breathtaking views and high-altitude terrain, with the 50K course reach..

The Breckenridge Oktoberfest 5K is a festive running event held in historic downtown Breckenridge, Colorado, as part of the larger Oktoberfest celebration. This 5K trail run takes participants through scenic Town of Breckenridge Trails, showcasing beautiful fall foliage and changing aspens. The race..

The Ned Ned Half Marathon is a long-standing trail running event held in Nederland, Colorado, celebrating 43 years of tradition. Set in the picturesque mountain town of Nederland at 8,236 feet elevation, the race offers a challenging 13.3-mile course with 1,408 feet of elevation gain, featuring dirt..

The Snow Mountain Ranch Trail Running Festival, held at the YMCA of the Rockies in Granby, Colorado, offers a scenic and challenging trail running experience with race distances of 50K, 33K, Half Marathon, 10K, and 5K. Set amid rolling hills, golden aspen groves, and mountain vistas, the courses fea..

The Pony Express Trail Run will take place in Woodland Park on Sunday 14 September 2025. You can run between 8 and 16 miles.

The Pikes Peak Marathon, held annually in Manitou Springs, Colorado, is a challenging 26.2-mile race featuring an elevation gain and loss of 7,834 feet. Participants run from Manitou Springs to the summit of Pikes Peak and back, making it a unique and demanding mountain marathon known as "America's..

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring two race distances: a 50K (30.6 miles) with 4,000 feet of ascent and a 30K (18.1 miles) with 2,080 feet of ascent. The courses traverse buttery singletrack trails, forest roads, and some paved sections, set..

The 24 Hours of Palmer Lake is an endurance running event held in Palmer Lake, Colorado, featuring a 24-hour race on a scenic 0.82-mile loop course atop the Palmer Divide at 7,240 feet elevation. Surrounded by mountains, the race offers a community-driven atmosphere focused on pushing mental and phy..

The Sawatch Ascent 50k is a challenging high-alpine trail race held in Nathrop, Colorado, showcasing the stunning Sawatch Range. Covering 33 miles with 7,000 feet of vertical gain, the course features a mix of 26 miles of singletrack, paved, and gravel roads, including 12 miles on the Colorado Trail..

The Rim to Rim Royal Gorge Races, held in Canon City, Colorado, offer a scenic and challenging running experience featuring three main events: a 5K road run, an 8-mile trail run, and a half marathon trail run. Each race includes the unique opportunity to cross the iconic Royal Gorge Bridge, the high..

The Above the Clouds Ultra is an annual trail running event held in Woodland Park, Colorado, featuring 50K and 10K race distances. Set against the stunning backdrop of Pikes Peak, known as "America’s Mountain," the course offers runners vibrant Colorado fall colors and fast, flowing singletrack trai..

The Castle Rock Trail Festival, held in Castle Rock, Colorado, offers a variety of trail running events on the scenic ridgeline trails of Philip S. Miller Park and Ridgeline Open Space. Distances include a 5K, 10K, half marathon, and an ultra-distance 50K, catering to runners of all levels.Families..

The Bear Chase is a trail running endurance festival held at Bear Creek Lake Park in Lakewood, Colorado. It offers multiple race distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K, catering to both first-time ultramarathoners and experienced trail runners. The course features mostly..

Rocky's Backyard Ultra is a unique ultra trail race held at the YMCA of the Rockies in Estes Park, Colorado, known as the highest organized Backyard Ultra in the world. Runners complete 4.167-mile laps on a challenging singletrack course featuring about 500 feet of elevation gain and loss per lap, w..

The Suffer Better Fall Trail Run is an annual mountain endurance event held at Staunton State Park, Colorado. The 9th edition, scheduled for October 11, 2025, features multiple race distances including a challenging 50K, a 25K with a unique Fishslappers division involving fish catching, and a new 5K..

The Bobcat Trail Race, held in Palmer Park, Colorado Springs, is a celebrated urban trail running event showcasing the park’s rugged beauty and panoramic views of the city and Pikes Peak. Organized by Aravaipa Running since 2024, it offers four race distances: 50K, 25K, 10K, and 5K. The courses feat..

The Indian Creek Trail Runs, part of the Human Potential Running Series, is an annual fall trail running event held at Indian Creek Campground in Sedalia, Colorado. Celebrating its 12th year in 2025, the race offers multiple distances: 5-Mile, 15-Mile, 55k, and 50-Mile, with time limits of 12 to 14..