2026 Boulderthon Boulder Marathon - Sep 27

Point-to-loop city and back-roads tour marathon course in Boulder with 184m elevation gain. A high-altitude scenic tour rather than a flat time-trial. The Start Village sits on the Pearl Street Mall between Broadway and 15th, with the start line at 21st and Pearl, and the whole course runs at over a mile above sea level (a high point near 5,406 ft / 1,648 m). Runners head out onto the quiet back roads of Boulder beneath the Flatirons foothills, with open mountain views, before winding back into