Byers Peak Stampede Half Marathon

The Luna (Latino Ultra Nature Adventure) is an inclusive, culturally relevant ultra running event held in Boulder, Colorado. Now in its third year, it offers various race distances, including 5km, 7 miles, 15 miles, and a marathon, all taking place on May 31, 2025. The event emphasizes human-nature..

The Summits Trail Runs, part of the Human Potential Running Series, is an exciting trail running event set in the stunning Rocky Mountains at Granby Ranch Resort, Colorado. Scheduled for June 14, 2025, the event features various race distances, including a challenging 43-mile Quad, a 27-mile Triple,..

The Sunset Trail Running Festival, taking place in Gold Hill, Colorado, features a variety of trail races including a 28K, 12K, 5K, and a Kids 1K. This event, organized by The Boulder Watershed Collective and T.E.A.M Boulder, aims to raise funds for wildfire preparation and community resilience init..

The Summit 200 is a challenging ultramarathon scheduled for July 28, 2025, in Summit County, Colorado. It features a 200-mile loop through scenic mountain terrain, with over 40,000 feet of elevation gain and sections exceeding 12,700 feet altitude. The race emphasizes a small, intimate field limited..

The Boulder Rez Marathon is a scenic running event held at the Boulder Reservoir in Colorado, featuring a variety of race distances including a marathon, half marathon, 3/4 marathon, and 10K. The course primarily consists of dirt roads and trails, offering stunning views of the reservoir and the Roc..

The Run the Rockies Trail Race is a scenic event featuring a 5k, 10k, and half marathon through the trails of Frisco Peninsula, offering stunning views of Dillon Reservoir and the Ten Mile Range. The courses include single track and dirt roads, starting and finishing at the Frisco Nordic Center. Par..