Boulderthon Marathon 2024 Lok. Tucked away in the foothills of the rockies in the stunning running mecca of. You can register online or show up early and.

The boulderthon, which includes a full marathon, half marathon, 10k, and 5k races, is scheduled to take place sunday, sept. Boulderthon marathon & half marathon, 10k, 5k boulder, co usa.