Boys Colorado State Champions: 1964, 1968, 1994, 1996-99, 2001-05, 2009 (Class 4A)
Girls Colorado State Champions: 1997-2003, 2005-07, 2011 (Class 4A)
The Mustangs have been among the best Colorado has to offer in one of the oldest prep sports on local record (there were unofficial state meets from 1902-21). In boys, the Mustangs have won 13 team titles, the most recent coming in 2009. For girls, Mullen has won a state-leading 11 times since team standings were first kept in 1975. The Mustangs will compete in Class 4A.