Inaugural Boulderthon is confirmed for October 10th, 2021. Register now.


The inaugural Boulderthon will take place on Sunday, October 10. The marathon will begin at 8:00am and the half marathon will start at 9:00am. The Full and Half Marathon will start at the Boulder Reservoir and finish downtown on Pearl Street at The Pearl Street Mall. The race course will feature downtown Boulder and views of the flatirons.

Downtown Access Map

Save the Date

Door Hanger Announcement

Download the Waze App to Avoid Road Closures!

Download the FREE Waze navigation app on your smartphone to help avoid road closures 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. A complete list of no-park zones is on our website.

Fore more information, please email, or click here for our Interactive Impact Map.

Our most up to date impacts will be posted here.

Information is updated as of Sept 2nd, 2021 and subject to change.