Registration for Boulderthon 2023 is now open! After nearly tripling in size and selling out last year, Boulderthon has instituted a new 5,000 runner cap and is expected to sell out again this year. Register today.
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marathon participants and tents in Boulder Reservoir

START & FINISH MAPS

Once available, Start & Finish Maps for our 2023 edition will be available here. Please refer to our 2022 edition maps for a preview of what's to come.

Marathon and Half Marathon Start Area Map

Boulder CO Marathon start area map

Most updated version as of 9/20/22

10K Start Area Map

Boulder CO 10K start area map

Most updated version as of 9/20/22

Finish Area Map

Boulderthon Expo Map

Most updated version as of 10/3/22

BOULDERTHON®
A STRONGER FASTER BOULDER CO. PRODUCTION

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© 2023 Stronger Faster Boulder Co.

Boulderthon is a Boston Marathon Qualifying (BQ), USATF Sanctioned Event, measured by a Level A USATF Course Measurer, representing the highest level of certification for a marathon race series.

Based in Boulder, Colorado, Stronger Faster Boulder Co. is a Colorado non-profit organization and federally-recognized as a 501(c)(3) tax-exempt foundation, EIN # 84-2863972. Donations and contributions are tax-deductible as allowed by law.