Rosengarten was born to Catholic parents and attended high school atValor Christian.[3] In the 2018 Colorado State Championship, Rosengarten intercepted a pass to help seal a state title for his team.[4] In Rosengarten's high school career he won two state titles in 2016 and 2018.[5] Coming out of high school, Rosengarten was rated as a four star recruit, and the number eleven tackle in the class of 2020.[6] Rosengarten decided to commit to playcollege football for theWashington Huskies.[7][8]
In Rosengarten's first two seasons in 2020 and 2021 he played in a combined five games with no starts.[9] In the 2022 season, Rosengarten played in and started all 13 games for the Huskies at right tackle.[10] For his performance on the 2022 season, Rosengarten was named First Team Freshman All-American.[11][12] During the 2023 season, Rosengarten was a part of the Huskies'Joe Moore Award-winning offensive line, which is awarded to the nation's best offensive line.[13] After the conclusion of the 2023 season, Rosengarten decided to declare for the2024 NFL draft.[14][15]
Rosengarten was selected by theBaltimore Ravens in the second round of the2024 NFL draft with the 62nd overall pick.[18] He made his NFL debut in Week 1 against the Chiefs and made his first start in Week 4 against the Bills. He appeared in all 17 regular season games and started 14 as a rookie in the 2024 season.[19]