The Rumble in the Rockies, or Colorado–Utah football rivalry, is an American college football rivalry between the University of Colorado Buffaloes from Boulder and the University of Utah Utes of Salt Lake City. After nearly five decades of dormancy, the rivalry was revived in 2011, when both joined the Pac-12 Conference. Despite the near half-century hiatus, the Colorado–Utah rivalry remains the fifth-most played rivalry in Utah's history, and the eighth-most played rivalry in Colorado's history.