Boulderthon Half Marathon is expected to sell out. Over 4,000 runners are expected at this year’s Boulderthon from 50 states and 13 countries, with registrations coming in over 2x the rate of last year. 5k, 10k, Full Marathon are Nearing Capacity. Register today.
aerial view of Boulder Colorado mountains


Race Results are available here from our Official Timer, RACE RESULT.

FinisherPix is the Official Photographer of Boulderthon. Your personal race photos are available here.