Crosby attended the University of Colorado Boulder, where he played on the Colorado Buffaloes football team from 2003 to 2006. While enrolled at Colorado, he displayed extraordinary leg strength, making a school-record 60-yard field goal against Iowa State in 2004. Crosby's 58-yard field goal against Miami in 2005 was the longest ever kicked in NCAA Division I-A football at sea-level without a tee. In all, Crosby holds 31 school records. Crosby connected on 66 of 88 field goals in total during his college career, and 30 of 34 inside 40 yards.