Roemer played extremely well at left tackle for the Aztecs as a redshirt sophomore in 2018 and was named second-team All-Mountain West for his efforts. His season ended with two regular-season games remaining, however, due to a suspension for violation of team rules. That suspension led to his decision to enter the 2019 NFL Draft as an early entry. Roemer was an All-State pick as an offensive and defensive lineman at Fernley High School in Nevada (also participating in basketball, swimming and wrestling) before heading to San Diego. He did not play as a true freshman, taking a redshirt season, but started all 13 games at left tackle in 2017, earning USA Today Freshman All-American notice and second-team All-Mountain West accolades.