He attended Becker High School, where he played basketball, football, and threw shot put and discus on the track and field team.

He was a two year starter at both offensive tackle and defensive end for Becker as the team went 25–1 and won back-to-back state championships.

Cloud Times, East Central District North Division Most Valuable Player, and first-team All-State.

[3][4] He was named second-team All-Missouri Valley Football Conference (MVFC) and started 15 games as a redshirt sophomore.

[14] He made his first career start at left tackle in Week 16 in place of an injured Taylor Lewan.

[15] Radunz entered the 2022 season as a backup guard behind Aaron Brewer and Nate Davis.