ColderBOLDER

The ColderBOLDER 5K is the “polar opposite” sister race to the BOLDERBoulder 10K. It is so popular that it sells out every.single.year.

ColderBOLDER is the perfect way to start the winter holiday season on the right foot. It’s a fast course that runs through picturesque CU campus and finishes in Balch field house where festivities and holiday spirit fill the air. You may even see Santa there!

Sign up for an individual volunteer position like Course Marshal. Or, register a volunteer group to work an Aid Station, Logistics, or other fun position and receive a donation to your non-profit! Either way, you'll get cool ColderBOLDER swag and front-row race day action. We love our volunteers, and we can't run it without you! 

Colder VolRUNteers 2024 - BOLDERBoulder 10K