Trail Running calendar near Boulder 2026-2027

Experience 13.1 miles of singletrack trails and hills in the Highlands Ranch Backcountry Wilderness Area. Enjoy custom medals and a post race pancake breakfast while competing for cash prizes in various categories.

Test your limits on a scenic and flat one mile dirt loop in Fort Collins. Choose between 6, 12, or 24 hour durations with full course support and a welcoming community atmosphere.

A trail race in Louisville, Colorado offering half marathon, 10 km and 5 km distances on dirt trails with views of the Flat Irons. The event includes aid stations, drop bag service and post race festivities in a family friendly setting.

Experience the rugged beauty of Staunton State Park at the Sawmill Trail Runs. Choose between 50km, 16 mile, or 8 mile distances through Colorado meadows and granite cliffs in this late season mountain challenge.