Boulderthon 2023: Boulder Marathon and Half Marathon |
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Run one of the fastest-growing, top-rated marathons in the country! Boulderthon 2023 is back, after nearly tripling its registration last year, with a 5,000 runner cap.
Run a 5k, 10k, Half, or Full, at the foothills of the Rockies, in the stunning running mecca of Boulder. Run the streets Olympians train on, then celebrate at our epic after-party downtown! |