Trail Running calendar near Frisco 2025-2026

The Colleen De Reuck XC Classic is a cross country running event held annually at Harlow Platts Community Park in Boulder, Colorado. Honoring renowned distance runner Colleen De Reuck, the race promotes health, fitness, and celebrates local Olympians, with 2025 honoring 2012 Olympic marathoner Yoshi..

The HRCA Backcountry Wilderness Half Marathon will take place in Highlands Ranch on Saturday 8 November 2025. You can run 13 miles.

The Louisville Trail Race, held annually in Louisville, Colorado, features a Half Marathon, 10K, and 5K, attracting runners to the scenic front range trails. The courses primarily consist of dirt trails with some bike paths, offering mostly flat terrain with challenging hills that provide stunning v..

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, approximately 40 miles southwest of Denver. The race offers three distance options: 8-Mile, 16-Mile, and 50k, with a combined runner capacity of 250. The course features scenic and challenging terr..

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 Gothic Mountain Tour, hosted by Crested Butte Nordic in Colorado, is a challenging and scenic cross-country ski race circling Gothic Mountain. It offers two race distances: a competitive 23.5-mile course starting behind Crested Butte Community School, and a 17.85-mile recreational course beginni..

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..

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..

The Niwot's Challenge will take place in Sedalia from Saturday 2 May 2026 to Saturday 9 May 2026. You can run between 24 and 100 miles.

The Greenland Trail Races, held annually in May at Greenland Open Space in Larkspur, Colorado, offer four trail running 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 hil..

Endure Trail Runs, hosted by the Human Potential Running Series, is an annual event held at Mueller State Park in Divide, Colorado. The 6th edition features multiple race options including a unique 12-Hour timed event where runners draw colored balls to determine their next loop, a marathon, half ma..

The Crazy Legs Trail Run will take place in Loveland on Sunday 7 June 2026. You can run 10 kilometers.

The Summits Trail Runs, held at Granby Ranch Resort in Colorado's Rocky Mountains, offer a challenging and scenic trail running experience with distances from 6 miles to ultra distances including a 50k and a 12-hour Elevation Challenge. The courses feature rugged alpine terrain, single-track trails,..

The Silverheels Trail Runs, hosted by the Human Potential Running Series, is a premier trail running event held near Como, Colorado, at an average elevation above 10,000 feet. The event features multiple race distances including 10-Mile, 19-Mile, 60k, 50-Mile, 100k, and 100-Mile, with courses showca..

The Summit 200 is a challenging 200-mile ultramarathon held in Frisco, Colorado, featuring a single loop through Summit County's stunning mountain terrain. The course includes scenic hiking trails, forest roads, and some pavement, with elevations ranging from 9,000 to nearly 13,000 feet and a total..