Trail Running calendar near Longmont 2025-2026

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 see how far they can run within their chosen time frame on a..

The Bingo! Trail Party is an annual trail running event held at May Farms in Byers, Colorado, organized by the Human Potential Running Series. It features multiple race levels, ranging from 6 to 62 miles, with participants running loops on scenic, mostly flat trails and farm roads. The unique format..

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 is an annual event held in Louisville, Colorado, featuring a half-marathon, 10K, and 5K trail runs. Celebrating its 12th year, the race showcases scenic trails with views of the Flat Irons and the front range mountains. The courses are primarily dirt trails, with the half-m..

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 complete an out-and-back course, collecting poker chips at the turnaround to determine their placing. Unique patches are awarded f..

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..

The USCSA Cross Country Ski Racing Festival is a premier event held at Snow Mountain Ranch Nordic Center in Granby, Colorado, scheduled for January 24-25, 2026. It features races for collegiate, high school, and middle school athletes, including classic and skate sprint events. The festival attracts..

The Winter's End Snowshoe Races, held at Granby Ranch Resort in Granby, CO, is an exciting winter running event that welcomes participants of all skill levels. Scheduled for March 7, 2026, the event features multiple race distances, including a marathon, 14-mile, 7-mile, and 5k, all set against the..