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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runners flock on the starting point of race

COURSE MAPS

Please refer to our maps below for a preview of what's to come.

Course Maps & Elevations may be adjusted based on covid-19 safety modifications, local and state recommendations, and higher-than-anticipated registration numbers to accommodate a larger participant count, and provide the best overall runner, spectator, and Boulder County & City of Boulder resident experience. If you have any questions, feedback, or suggestions, please do not hesitate to contact us at hi@boulderthon.org.

Interactive Course Map

Full Marathon Course Map & Elevation
Boulder CO Marathon full marathon course mapCourse maps presented by Boulderthon's exclusive map sponsor, OS Maps!
Half Marathon Course Map & Elevation
Boulder half marathon course mapCourse maps presented by Boulderthon's exclusive map sponsor, OS Maps!
10k Course Map & Elevation
Boulder CO Marathon 10k course mapCourse maps presented by Boulderthon's exclusive map sponsor, OS Maps!
5k Course Map & Elevation
Boulderthon 5k course mapCourse maps presented by Boulderthon's exclusive map sponsor, OS Maps!
Kids Course Map & Elevation
Boulderthon Kids Run course map
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.