Trail Running calendar near Winter Park 2025-2026

The Colorado 24 Hour Run, held in Fort Collins, Colorado, offers a unique endurance running experience on a scenic, flat one-mile dirt loop. Participants can challenge themselves in various timed events including 6, 12, and 24-hour runs, as well as relay options for each duration. The course is desi..

The HRCA Backcountry Wilderness Half Marathon is an annual 13.1-mile trail race held in Highlands Ranch, Colorado, featuring a scenic single-loop course through the Douglas County East/West trail and the Backcountry Wilderness Area. The race offers a challenging route on dirt, gravel, and singletrac..

The Louisville Trail Race, held annually in Louisville, Colorado, features a Half Marathon, 10K, and 5K, attracting runners to the scenic front range trails. Celebrating its 12th year, the event offers mostly dirt trail courses with some bike path sections, showcasing the stunning Flat Irons and fro..

The Thumbs Up Vertical Challenge is an 8-hour ascent race held in Estes Park, Colorado, on the Thumb Open Space trail. Participants repeatedly run a 1 km out-and-back course with a 540-foot elevation gain per ascent. Runners collect poker chips at the turnaround point to track their completed ascent..

The Sawmill Trail Runs is an annual trail running event held at Staunton State Park in Pine, Colorado, about 40 miles southwest of Denver. Established in 2013 and officially a race since 2017, it offers three distance options: 50k, 16-mile, and 8-mile runs. The course features scenic and challenging..

The USCSA Cross Country Ski Racing Festival, held at Snow Mountain Ranch Nordic Center in Granby, Colorado, is a vibrant collegiate and junior skiing event scheduled for January 24-25, 2026. It features classic races of 15 km and 7.5 km for college and independent high school athletes, alongside CHS..

Run the Ranch is an annual trail running event held at the scenic Sylvan Dale Guest Ranch in Loveland, Colorado. The race offers a variety of distances including 5K, 10K, and timed trail runs of 4, 6, and 12 hours, with options for solo runners and 4-person relay teams. Participants run on private r..

Niwot's Challenge is a highly demanding ultramarathon held annually in Sedalia, Colorado, along the South Platte River in the Front Range. Modeled after the grueling Barkley Marathons, it features a mostly off-trail course requiring advanced navigation skills using map and compass, with no GPS allow..

The Greenland Trail Races, held annually in May at Greenland Open Space in Larkspur, Colorado, offer four race distances: 4 miles, 8 miles, 25K, and the 50K ultramarathon, known as Colorado's fastest 50K. The course features wide, smooth dirt trails through native grasslands, ponds, oak hills, and p..

Endure Trail Runs, part of the Human Potential Running Series, is held annually at Mueller State Park near Divide, Colorado. The event offers multiple distances including a unique 12-Hour timed run, marathon, half marathon, and 10k, all featuring scenic single and double-track trails with no pavemen..