In his first season with starting reps for the Bombers in 2011, Garrett cemented the starting role as a third stringer. He gained the spot after starters Fred Reid and backup Carl Volny went down with injury in the same game. Garrett then helped the team to the 99th Grey Cup with a 190 yard performance in the CFL East final against the Hamilton Tiger-Cats. He dedicated the game ball to former teammate Marcellis Williamson in an emotional tribute after the game, also promising to send the ball to Williamson's family. Garrett was then named the offensive player of the week by the CFL, for his playoff performance against the Tiger-Cats.
Garrett missed the entire 2012 CFL season after injuring his injured his Achilles in training camp. Upon recovery during the following season, he was released by the Bombers on August 14, 2013.