2017: Johnston will compete to get playing time at offensive tackle as a sophomore in 2017.
2016: Johnston served as a backup offensive tackle as a redshirt freshman in 2016, appearing briefly there and on special teams in 3 games (Utah State, Stanford, Utah).
2015: He redshirted as a reserve offensive tackle as a first-year freshman at USC in 2015. He enrolled at USC in the fall of 2015 and was awarded a scholarship by virtue of an NCAA rule known as “blueshirting” (it allows a non-recruited student-athlete to receive athletic financial aid after beginning practice and have that student-athlete count towards the next year’s signing class if the school has reached its NCAA-maximum aid limit for the current year).
HIGH SCHOOL: He made 2014 Prep Star All-West Region, Max Preps All-State Division I second team, Cal-Hi Sports All-State fourth team, Tacoma News Tribune Western 100, All-CIF Pac 5 Division, Orange County Register All-Orange County first team and All-Trinity League first team as a senior offensive tackle at Servite High in Anaheim (Calif.). Current Trojan Joel Foy also prepped at Servite.
PERSONAL: He is a communication major at USC.