Rosengarten attended high school at Valor Christian. In the 2018 Colorado State Championship, Rosengarten intercepted a pass to help seal a state title for his team.[2] In Rosengarten's high school career he won two state titles in 2016 and 2018.[3] Coming out of high school, Rosengarten was rated as a four star recruit, and the number eleven tackle in the class of 2020.[4] Rosengarten decided to commit to play college football for the Washington Huskies.[5][6]
College career
In Rosengarten's first two seasons in 2020 and 2021 he played in a combined five games with no starts.[7] In the 2022 season, Rosengarten played in and started all 13 games for the Huskies at right tackle.[8] For his performance on the 2022 season, Rosengarten was named First Team Freshman All-American.[9][10] 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.[11] After the conclusion of the 2023 season, Rosengarten decided to declare for the 2024 NFL draft.[12][13]