Voted "America’s All-Time Best 10K” by Runner’s World, BOLDERBoulder has defined, re-defined and set new standards for run events. If there’s a better way to run a race, you’ll see it here first. The BOLDERBoulder isn’t just another race. It is the 10K by which all others are measured. Runners come to the BOLDERBoulder from all corners of the globe. Every running of the BOLDERBoulder is one race with over 50,000 personal stories. Nuun Sport will be on course and at the expo. Come by and say hi, would love to meet you.