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.
female participant running in Boulderthon


Boulderthon® has established an athlete elite program to bring world-class athletes in from our own backyard, to runners from all over the globe with special incentives. If you are male with a Marathon PR of 2:40 (Half: 1:10 PR) or female with a Marathon PR of 3:15 (Half: 1:25 PR), please contact us at for more information, and include a link to your PR.