The Rocky Mountain Showdown is the name given to the Colorado–Colorado State football rivalry. It is an American college football intrastate rivalry between the University of Colorado Buffaloes and the Colorado State University Rams; the winner of the game receives the Centennial Cup. It began in 1893 and was played annually from 1899 to 1958, except for 1901, 1905, and 1943–44. It was revived in 1983 and played periodically until it became an annual rivalry once again from 1995 to 2019.