LSU Freshman season Johnson started his freshman season as the team's third-string quarterback before being named the team's starter before LSU's game against
Florida. In his first career start, he threw for 239 yards and three touchdowns in a 37–34
upset victory over the sixth-ranked Gators and was named the
Southeastern Conference Offensive Player of the Week for his performance. The following game, Johnson passed for an LSU freshman record 435 yards with three touchdowns and an interception while also rushing for 45 yards and two touchdowns in a 53–48 win over
Ole Miss. In his first season at LSU, Johnson completed 88 out of 150 attempted passes for 1,069 passing yards, 8 touchdowns and one interception.
Sophomore season Johnson was named LSU's starting quarterback during preseason training camp following an injury to
Myles Brennan. In his sophomore and final season at LSU, Johnson completed 225 out of 373 attempted passes for 2,814 passing yards, 27 touchdowns and 6 interceptions. On December 7, 2021, Johnson announced via social media that he would be leaving LSU to enter the transfer portal.
Texas A&M On December 17, 2021, Johnson announced he would transfer to
Texas A&M. He appeared in 12 games over two seasons for the Aggies, but never started a full season during his time in College Station. His most extended action came during the 2023 season, when he appeared in eight games, filling in for the injured
Conner Weigman. Johnson threw for 1,452 yards, nine touchdowns, and 5 interceptions in 2023. After the conclusion of the regular season, Johnson entered the transfer portal once again, this time as a graduate transfer.
North Carolina On November 29, 2023, Johnson committed to
North Carolina. Following
Drake Maye's departure, Johnson competed with
Conner Harrell for the Tar Heel starting quarterback job, with Johnson being named the starter. In the season opener against
Minnesota, he left the game with a right-leg injury. The next day, it was announced that Johnson would miss the remainder of the 2024 season after undergoing surgery.
Georgia Southern On January 10, 2026, Johnson announced that he would be transferring to
Georgia Southern.
Statistics ==Personal life==