On November 24, 2017, UCLA Bruins quarterback Devon Modster came in at halftime in relief of Josh Rosen following a brutal hit against the California Golden Bears. With Modster in, UC L.A. would win 30–27.
On September 21, 2018, Modster announced that he would be transferring from UC L.A. after finding himself behind Wilton Speight and Dorian Thompson-Robinson on the depth chart.
On December 14, 2018, Modster announced his commitment to Cal.
In the 2017 season, Modster completed 51 of 79 passes (64.