Run Boulderthon: The Boulder Marathon

Run Boulderthon: The Boulder Marathon is a premier fall running event held in Boulder, Colorado, nestled in the scenic foothills of the Rocky Mountains. Recognized as one of the top half marathons in the U.S., it features a stunning course that begins at Boulder Reservoir, runs along the Flatirons, and finishes with an epic downtown finish on Pearl Street Mall. The race offers a boutique experience with big-city amenities, including gear check, pace groups, and plentiful aid stations.

With a cap of 13,000 runners, the event is USATF-sanctioned and Boston Marathon qualifying, attracting athletes worldwide to enjoy breathtaking views, a vibrant atmosphere, and a lively after-party. Visit the organization's website for the most recent information.