Kowack shot 11-under and won by one shot, holding off teammates Calum Scott of Texas Tech and Tyran Snyders of Texas Tech.
Kowack and Snyders went to the final hole tied at 10-under, and a birdie by Kowack and a par by Snyders gave Kowack the win.
Scott played for GB&I in the 2023 Walker Cup.
Kowack shot a final round 5-under 67, while Snyders shot a final round 1-under 71.
Bastien Amat of New Mexico, Jakob Melin of San Francisco, and Albert Boneta of New Mexico all finished T4 and two shots back of Kowack at 9-under.
Far back of the top two, San Diego State finished in third place at 14-under, San Francisco finished in fourth place at 12-under, and UNLV finished in fifth place at 11-under.
