The Ralston Creek races offer a winter half-marathon and 5K run in Arvada, Colorado, featuring courses on a mix of road and bike path with rolling terrain. Participation is capped for each distance. Entry includes race participation, a finisher’s medal for half-marathon finishers, free race photos, music, refreshments, and event shirts. Post-race festivities take place at a local tap house with discounts for participants. The event is the final race in the Racing Underground Winter Running Series, which includes three races. Series finishers and top age group performers receive awards.