Grimble has 44 catches for 460 yards (10.5 average) and 9 TDs in his career. He has 16 career starts.
Grimble again shared starts at tight end as a sophomore in 2012. Overall in 2012 while appearing in all 13 games and starting 9 times (all but Hawaii, California, Arizona State, Notre Dame), he had 29 catches for 316 yards (10.9 avg.) with 5 TDs and also made 3 tackles. He made 2012 CollegeFootballNews.com Sophomore All-American honorable mention and All-Pac-12 honorable mention. He had 2 catches for 38 yards against Hawaii. He fought off 4 tacklers to score on a 22-yard reception at Syracuse. He had a 19-yard reception at Stanford, then 2 catches against California (38 yards), Utah (16 yards) and Washington (42 yards, including an 18-yard TD). He caught 3 passes for 26 yards, with an 8-yard TD, against Colorado, then had 2 catches for 29 yards, including a 12-yard TD, and he made a tackle at Arizona. He had 5 catches for 23 yards and a tackle against Oregon, then had 5 catches for 20 yards with a TD against Arizona State. He had a 15-yard reception at UCLA, a 9-yard catch against Notre Dame and 2 catches for 119 yards against Georgia Tech.
Started 7 games (Minnesota, Utah, Syracuse, Arizona State, California, Notre Dame, Stanford) at tight end as a redshirt freshman in 2011 and was an often-used backup in USC's other 5 games. He also played on special teams. Overall in 2011 while appearing in all 12 games, he had 15 catches for 144 yards (9.6 avg.) with 4 TDs, plus 2 kickoff returns for 3 yards (1.5 avg.). He made 2011 CollegeFootballNews.com Freshman All-American honorable mention. He had a 1-yard catch against Minnesota, then caught 5 passes for 66 yards, with a 9-yard TD catch, against Utah. He had 2 catches for 17 yards (with a 9-yard TD) against Syracuse and a 7-yard TD catch against Arizona. He had 2 receptions for 12 yards at Notre Dame, 2 catches for 15 yards and a 3-yard kickoff return against Stanford, a 5-yard TD catch at Colorado and a 21-yard reception at Oregon. He caught a 2-point conversion pass against UCLA.
Redshirted as a freshman tight end in 2010, his first year at USC. He was slowed for USC's first 3 games (Hawaii, Virginia, Minnesota) with an ankle sprain.
His 2009 honors included Parade All-American, Under Armour All-American,Super Prep All-American, Prep Star All-American, Scout.com All-American first team, USA Today All-USA second team, EA Sports All-American second team, Max Preps All-American second team, Sporting News Top 100, Super Prep Elite 50, Prep Star Dream Team, Super Prep All-Farwest, Prep Star All-West, Orange County Register Fab 15 first team, Long Beach Press-Telegram Best in the West first team, Tacoma News Tribune Western 100, All-State 4A and All-Southwest District Offensive MVP as a senior tight end at Bishop Gorman High in Las Vegas (Nev.). He had 39 catches for 709 yards (18.2 avg.) with 9 TDs in 2009. Bishop Gorman went 15-0 and won the state 4A title in 2009. As a junior in 2008, he had 13 receptions for 310 yards (23.8 avg.) with 4 TDs. Bishop Gorman won the state title in his 2007 sophomore season. He also played basketball at Bishop Gorman.
His cousin, Jalen Grimble, is a sophomore defensive end at Miami (Fla.).