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.
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