Boulder Mountain Marathon & 10 Mile Ascent

Run a marathon or challenge yourself with the 10-mile Ascent in the mountains of Boulder County. Enjoy varied terrain and spectacular views as you follow dirt roads and the Switzerland Trail. The Ascent begins at the Adventure Lodge at the base of Fourmile Canyon and ends in Gold Hill. The marathon starts and finishes at the historic Gold Hill Inn. All proceeds benefit the Fourmile Fire Protection District.