Jay Ajayi scored three touchdowns and amassed 280 yards of total offense Saturday night to lead Boise State past Colorado State 37-24 in the Mountain West Conference opener for both teams.

Boise State coach Bryan Harsin notched his first career head-coaching victory to move to 1-1 and avoid the Broncos' first 0-2 start since 2005.

Colorado State (1-1), which rushed for 266 yards in its season-opening win over in-state rivals Colorado, gained 28 yards rushing on 23 carries. The Rams were forced to rely on Garrett Grayson, who was 31-of-58 passing for 434 yards with three touchdowns and two interceptions.

Ajayi ran for 219 yards on 33 carries and caught four passes for 61 yards. He scored on runs of 8 and 14 yards and caught a 21-yard touchdown pass to help Boise State build a 30-10 halftime lead.