Trail Running calendar near Boulder 2026-2027

Experience the scenic trails of Bear Creek Lake Park at this multi day endurance festival in Lakewood. With distances ranging from a 5K to a 100K ultra marathon, the event features fast non technical dirt paths and panoramic views.

Experience the scenic HRCA Backcountry Wilderness Area with trail races for the whole family. Enjoy rolling hills and open views followed by a pancake breakfast and finisher medals for all participants in Littleton.

The Castle Rock Trail Festival will take place in Castle Rock on Saturday 3 October 2026. You can run between 5 and 50 kilometers.

Experience the beauty of the Colorado Front Range at the Indian Creek Trail Runs. Choose from four distances on scenic single track trails through pine forests and golden aspen groves near Sedalia.

Experience the scenic redstone hardpack of Northern Colorados Front Range mountains. This event offers marathon and half marathon distances on singletrack trails with moderate elevation and generous time limits.

Experience single track trail running at Bear Creek Lake Park with views of the Denver skyline. Choose between 5 and 10 mile distances followed by a post race party including a finisher meal and park entry.

Trail races at Bear Creek Lake Park offering 5 km, 15 km, a 5 km plus 15 km double, and a Kids 1 km. Main race registration includes socks or a neck gaiter and a pancake breakfast while kids receive a stuffy at the finish.

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.

Experience the scenic beauty of the Front Range at this annual Colorado trail event featuring half marathon, 10K, and 5K distances on mostly dirt paths with views of the Flatirons.

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.