WSU last held an opponent scoreless when it defeated Idaho 42-0 on Sept. 21, 2013.
The defense's performance was significant as the offense struggled to sustain drives during the first half. Luke Falk completed 21 of 23 passes for 156 yards, but only threw for one touchdown on an 11-yard pass to Dom Williams in the second quarter.
The Cougars defense, which allowed just 175 yards during the first half, appeared poised to put the team in position to turn the game into a rout on the ensuing possession when lineman Darryl Paulo stripped quarterback Cade Apsay. But the ball ricocheted off a WSU defender and was recovered by wide receiver Nelson Spruce at the Buffaloes' 29-yard line.
It did not hurt the Cougars on the scoreboard, though. That is because Diego Gonzalez missed a 33-yard field goal. Gonzalez's 47-yard attempt during the first quarter also sailed wide right.
After being forced to punt and turning the ball over on downs during its first two possessions, WSU took advantage when the Buffaloes failed to convert on fourth-and-1 at their own 42. On fourth-and-6, Luke Falk found senior wide receiver Dom Williams along the left side for a 29-yard gain to Colorado's 9. Keith Harrington later scored on a 1-yard run.