Boulder Rez Marathon 2024 Registration. 5565 51st st, boulder, co 80301. Live tracking is available here on race day and on the boulderthon ios app and android app.

 — experience the thrill of running through the breathtaking landscapes of boulder, colorado in the highly anticipated boulder rez marathon on the 3rd of august. Attracting athletes from all over the west due to its phenomenal scenery, glamorous finisher.