Ostrem attended Shorewood High School, whilst playing club soccer with Seattle United and Washington Crossfire, where he won the State Cup with Seattle and was a two-time Surf Cup champion.[1]
College & amateur
In 2018, Ostrem attended the University of Washington to play college soccer. In four seasons with the Huskies, Ostrem made 75 appearances, scoring four goals and tallying 22 assists. While at college, Ostrem earned All-American and 2020-21 PAC-12 Defensive Player of the Year honors following a strong junior campaign, and also achieved All PAC-12 First Team recognition.[1][2]
While at college, Ostrem also appeared for Crossfire Redmond during the NPSL 2019 season, where he netted six times in eight regular season games.[3][4]