Schooler played the first two years of his whole high school career at Tesoro High School and Trabuco Hills High School before playing his final two years at Mission Viejo High School which is located in Mission Viejo, California. He was a two-way player, playing as a running back and wide receiver on offense and linebacker on defense. He also play basketball and track and field. As a senior on defense, he recorded 77 tackles and 10.0 sacks and rushed for 1,161 yards and gathered 464 receiving yards with 25 total touchdowns. Schooler made All-County First Team Defense and was named Defensive Player of the Year for Orange County after the 2016 season. He finished his senior year with 77 tackles, 4.0 TFL, 2.0 sacks, 2 INT, 2 PBU, and a forced fumble. In his two varsity seasons at Mission Viejo, he compiled 198 tackles, 13.0 TFL, 9.5 sacks, 3 INT, 9 PBU, 6 forced fumbles, and 4 fumble recoveries. He was a three-star recruit by 247sports. Schooler received offers from multiple top football programs including Arizona, Fresno State, UNLV, Nevada, and New Mexico. He committed to Arizona in 2016.
College career
2017
Schooler finished 11th in the Pac-12, and second among freshmen with 88 tackles, trailing only freshman teammate Tony Fields II. Schooler added 13.5 tackles for loss, most among all FBS freshmen, 3.0 sacks and two interceptions. In nine Pac-12 games, he posted 81 tackles and all 13.5 tackles for loss. Schooler was named Pac-12 Defensive Freshman of the Year.
2018
Named a First Team All-Pac-12 selection by the Associated Press while garnering honorable mention honors from the league office…Started all 12 games at the Mike linebacker position, totaling 119 tackles, including 72 solo stops, 21.5 tackles-for-loss and 3.5 sacks…The 21.5 TFLs ranked fifth-most in UA single-season history …Added four pass breakups, two interceptions, one forced fumble, one fumble recovered and scored on a safety…Led all Power 5 defenders with 1.79 tackles-for-loss per game…Ranked fifth in the Pac-12 and No. 23 in FBS with 9.92 tackles per game…Registered double-digit tackles in six contests, while totaling nine stops in four other games…Recorded a TFL in 10 of the 12 games, including a season-high 4.0 in road win at Oregon State…Battled illness to record five tackles in Territorial Cup against ASU …Totaled 13 tackles with 2.5 for loss and 0.5 sacks at Washington State …Credited with nine tackles, including 3.0 for loss and 1.0 sacks along with a PBU in win over Colorado …Recorded 11 tackles with 1.5 for loss in upset of No. 19 Oregon …Posted 10 tackles with 3.0 for loss and 1.0 sacks in road contest at UCLA …Had five tackles and an interception at Utah …Collected nine tackles, 1.0 for loss and one interception in win over California. Was credited for 50 yards on the interception return before fumbling, where teammate Azizi Hearn scooped the ball and advanced it to endzone for a touchdown…Racked up 13 tackles, including 0.5 TFLs, with a fumble recovery against USC …Totaled 10 tackles with 4.0 for loss and 1.0 sacks in win at Oregon State …Notched nine tackles with 2.0 for loss in win over Southern Utah …Tallied nine tackles with 3.0 for loss, a breakup and scored on a safety at Houston …Opened season with 16-tackle performance that included 1.0 TFLs against BYU.
2019
Named All-Pac-12 Honorable Mention...Started all 12 games for Arizona at middle linebacker...Led the team with 98 total tackles and 11 tackles-for-loss...Also recorded two pass breakups, two fumble recoveries and 1.5 sacks...Has led the team in tackles for two straight seasons and tackles-for-loss for three straight seasons...Enters his senior season with 312 career total tackles, which is tied for 15th most in program history...His 46 career tackles-for-loss rank fourth-most in school history, three behind Dana Wells and Joe Tafoya, who are tied for second...Opened his junior season with nine tackles, a half of a sack and one fumble recovery at Hawai’i...Totaled eight tackles and 1.5 tackles-for-loss in home win over Texas Tech...Picked up a season-high 13 tackles in home win over UCLA, while also totaling two tackles-for-loss and one pass breakup...Helped Arizona earn road win at Colorado with eight tackles and one tackle-for-loss...Recorded nine tackles and one fumble recovery at USC...Finished with nine tackles the following week as well at Stanford, including a half tackle-for-loss and one pass breakup...Totaled nine tackles for the third straight week against Oregon State, while also recording one tackle-for-loss...Finished with six tackles and a half tackle-for-loss at Oregon...Recorded his second double-digit tackle game of the season against Utah...Also added seven solo stops, one tackle-for-loss and one sack against the Utes...Finished the season with a 10-tackle, 2.5-tackle-for-loss game against ASU...Recorded at least a half tackle-for-loss in 10 of 12 games on the season...Had eight tackles or more in nine of 12 games.
2020
Personal life
Colin is the son of Tom and Christine Schooler. Colin has one brother Brendan and one sister. Colin’s father, Tom, who he played football at Eastern Michigan. Colin’s mother, Christine, who she played volleyball at Cal State. LA. His brother, Brendan, former Oregon receiver, transferring to Arizona will be eligible to play the 2020 season a graduate transfer. He is majoring in literacy, learning & leadership.
