USATF Colorado Grand Prix Series

A six-race series featuring diverse distances and events across Colorado, culminating in the Wash Park Circuit in Denver. The series includes the BOLDERBoulder 10K, Cookie Chase 5K, Mountain Avenue Mile, Windsor Half Marathon, USATF Colorado Cross Country Championships, and Wash Park Circuit. The series opens on Memorial Day and concludes on November 15. When: Monday, May 25, 2026 at 12:00 AM - Sunday, November 15, 2026 at 12:00 AM MDT