Bolder Boulder 5K

The Bolder Boulder 5K delivers Colorado mountain energy with quirky local character. Runners navigate through this university town's tree-lined streets in a shorter version of the iconic 10K. May's clear mountain air provides perfect racing conditions despite the 5,300-foot elevation as participants experience both Boulder's counter-culture vibe and serious athletic tradition. The moderately challenging course offers spectacular Flatiron mountain views throughout. Boulder spectators in costume create a party atmosphere as participants flow through America's running mecca. This spirited race captures Boulder's distinctive character—environmentally conscious and fitness-obsessed—offering a quintessential Rocky Mountain running experience for those seeking a shorter challenge.