BolderBOULDER Elevates the Standard 10K Run to 5,430 Feet In 1979 BolderBOULDER first started with a group of runners that wanted to create an annual event that covered 10K in distance. Forty years later the event has expanded to over 50,000 runners and thousands in attendance. The community of Boulder, Colorado invites professional and amateur athletes to compete in a race that concludes in Folsom Field Stadium. Folsom Field during BolderBOULDER 2018. Photo by: Matthew McGuire Spectators and contestants kicked off the race within the streets of Boulder, Colorado early on Monday, May 28. The 40th annual BolderBOULDER