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.
aerial view of Universtiy of Colorado stadium


In its second annual edition, Boulderthon nearly tripled in size, drawing runners from all 50 states as well as 15 countries, as the signature city marathon showcases Boulder’s beautiful downtown and spectacular views of the Flatirons.

No parking garages will be closed during Boulderthon. All parking garages remain fully open for the community & staff.

Please review our impacts below.

Saturday Garage Access Map

Sunday Garage Access Map

Downtown Access Map

Saturday No Parking Map

Sunday No Parking Map

Interactive Course Map: Boulderthon Half Marathon, Marathon, 10k, 5k, Kids Run

Door Hanger

Save The Date

Download the Waze App to Avoid Road Impacts!

Download the free Waze App on your smartphone to help avoid road impacts on Race Weekend. Type Waze into your app store or visit for more information.

No Parking Zones

Areas along the route will be marked as “No Parking Zones.” Please adhere to the dates and times posted; all zones will be enforced. Please reference our No Park Zones as well as our Weekend Road Impacts

Fore more information, please email Our most up to date impacts will be posted here. Information is updated as of August 1st 2022 and subject to change.