Trail Running calendar near Frisco 2025-2026

The Castle Rock Trail Festival, also known as the liveBIG Run, is an exciting trail running event held in Castle Rock, Colorado, featuring courses through the scenic Philip S. Miller Park and Ridgeline Open Space. It offers a variety of distances to suit all levels, including a 5K, 10K, half maratho..

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 Great Trailhead Foot Race 10 Miler, held at Bear Creek Lake Park in Lakewood, Colorado, offers runners a scenic trail experience with single-track dirt paths against the backdrop of Denver's skyline. Participants can choose between a 5-mile or a challenging 10-mile double-lap course. Registratio..

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..

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

The Louisville Trail Race, held annually in Louisville, Colorado, features a half marathon, 10K, and 5K on scenic front range trails with the iconic Flat Irons as a backdrop. The courses are mostly dirt trails with some bike path sections, offering a mostly flat terrain with challenging hills that p..

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

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. Offering 50k, 16-mile, and 8-mile distances, the race features a scenic and challenging course through diverse terrain ranging from high grassy meadows..

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..

The Winter's End Snowshoe Races, held at Granby Ranch Resort in Granby, Colorado, offer a unique winter running experience on mostly groomed single and double-track trails. The event features multiple distances including a marathon, 14-mile, 7-mile, and 5k races, accommodating runners of all skill l..

The 21st Annual Run Through Time Trail Marathon and Half Marathon takes place in Salida, Colorado, featuring challenging courses on dirt roads, jeep trails, and narrow, hilly single tracks with stunning views of Salida and the Arkansas Valley. Elevations range from 7,000 to 9,000 feet. The event inc..

The Greenland Trail Races take place annually in May at Greenland Open Space in Larkspur, Colorado. Offering four distances—4 miles, 8 miles, 25K, and the state's fastest 50K—the event features a scenic course through over 3,000 acres of native grasslands, ponds, oak hills, and ponderosa pine forest..