Boulderthon

Date and Time for this Past Event

• Sunday, Oct 8, 2023  7:30am

Location

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Details

Run one of the fastest-growing, top-rated marathons in the country! Named one of the “Top 5 Best Half Marathons in the United States” by Active, Boulderthon — the signature Boulder Marathon series — is back!

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.

After nearly tripling in size last year and selling out, Boulderthon has instituted a new 5,000 runner cap this year and is expected to sell out again. Secure your spot in Colorado’s largest fall running weekend!