As a freshman in 2016, Kowar appeared in 12 games, pitching to a 3-0 record and 3.37 ERA with 44 strikeouts in innings pitched. His season was ended in May as he was sidelined due to a medical condition not related to baseball. He returned in 2017 and went 12-1, tying Florida's best single-season record in school history, along with posting a 4.08 ERA with 84 strikeouts in 19 games (18 starts). During the 2017 College World Series, Kowar earned the save in the championship game, pitching scoreless innings, clinching Florida's 2017 national title. In 2018, as a junior, Kowar was named to the All-SEC Second Team. He finished his junior year with a 10-5 record and a 3.04 ERA in 18 starts.
