Klein became a starter on the offensive line as a true freshman at UTEP in 2018, starting four games before deciding to redshirt.[2] He played eight games, six as a starter at right guard in 2019, and then started all eight games in the same position in 2020.[2] He was named honorable mention All-Conference USA in 2021, while starting 13 games at right guard, and won the honor again in 2022 while starting 12 games at right guard.[3] In his final season, 2023, he started 12 games and was named first-team All-Conference USA.[4] He finished his collegiate career having started 55 games.[5] Klein was invited to the 2024 East–West Shrine Bowl, but was not selected for the NFL Scouting Combine.[1][6]