Race Information

Boulderthon: Downtown Boulder Marathon
Boulder, CO
Boulder County
Sep 28, 2025 - Sunday
26.2M, 13.1M, 10K, 5K run | kids run

For the love of all that is good and moisture wicking...

Though we try to be accurate and on top of things... Race details can change when we aren't lookin. And once in a while we simply make a mistake.

ALWAYS visit the race's website for the most complete and accurate race information.

Listing Status

  • Added to our Directory
    Jan 24, 2020
  • Last Updated in our Directory
    Oct 3, 2024
  • Last checked by a snack-eating human.
    Oct 14, 2024
  • Appears in Directories

Updates, Options, Corrections, or Problems

Run-Time: Saved Race

  • A Saved Race is one that has been added to your personal directory. You can organized races in lists, and add comments for your own personal reminders and information.
  • You must Create an Account and Log In to save races to your own personal directory.
  • Learn more about Saved Races

Claimed Race