He played football at LaSalle High School in Pasadena, California prior to his senior season, when he played for San Clemente High School in San Clemente, California.

Rettig played in the Under Armour All-American Game at Tropicana Field in Saint Petersburg, Florida on January 2, 2010.

[2][4] Rettig made his debut at BC playing against Notre Dame in the third game of the 2010 season.

He made a 58-yard touchdown pass to Bobby Swigert but had to leave the game due to an ankle injury.

He connected with junior wide receiver Alex Amidon 78 times in his breakout season for 1,210 yards.