ColderBOLDER 5K
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ColderBolder 5K : December campus race
The COLDERBolder 5K began in 2003 as part of a racing series and is the sister race to the BOLDERBoulder 10K. It is a locally owned and operated event that has sold out in recent years. The course runs through the University of Colorado campus and is described as a fast route that finishes inside the university field house, where holiday festivities take place.
The event uses a time-seeded race format with 14 individual races plus a walking wave. The first 13 races group runners by previous race times so competitors of similar speed race together; for example, runners who finished the BOLDERBoulder in 52 minutes race against those who finished between 52 and 54 minutes. The top three finishers in each individual race receive Cold Medals. The 14th race is an Open Race with no qualifying standards. The Walking Wave is open to anyone who wants a festive stroll through the CU campus.
The COLDERBolder is scheduled in December and is presented as part of the same organizing series that runs the BOLDERBoulder events. The 2026 COLDERBolder is listed for Saturday, December 5th. Visit the organization's website for the most recent information.
