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.
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