The Colorado State–Wyoming football rivalry is an American college football rivalry between the Colorado State Rams football team of Colorado State University and Wyoming Cowboys football team of the University of Wyoming. The Bronze Boot is awarded to the winner of the game. This rivalry has evolved into one of the most bitterly contested in college football. The teams have waged the "Border War" more than one hundred times since the schools began playing in 1899, playing every year except 1901, 1902, 1906, 1907, 1918, 1924, 1926, 1927, 1928, 1943, 1944, and 1945. In fact, this is one of the oldest interstate rivalries west of the Mississippi River, and the oldest west of the Missouri. The series is the oldest rivalry for both schools and the "Border War" has been played in three differen