Going out of Brighton High School in Cottonwood Heights, Utah, Fehoko was a consensus four-star recruiting prospect. Additionally, all three major recruitment websites had Fehoko listed as a top two player in the state. Prior to his commitment to Stanford, Fehoko had offers from Michigan, Arizona State, and Colorado. In February of 2016, Simi Fehoko signed his letter of intent, and enrolled in classes in June.
As a freshman in 2018, Fehoko appeared in four games, which allowed him to retain a year of eligibility per NCAA rules. Despite playing in four games, Fehoko only recorded one catch for six yards in a game against Oregon State.
2019 saw Fehoko start in one game, but played in 12 games for the Stanford Cardinals. He finished with 24 receptions for 566 receiving yards and six touchdowns. However, the most impressive stat from the 2019 season might be Fehoko’s 23.6 receiving yards per reception average.
With the Pac-12 playing a shortened 2020 season due to the coronavirus, Simi Fehoko appeared in six games, and started in four, for Stanford. He finished with 37 receptions for 574 yards and three touchdowns. Additionally, Fehoko was named to the All-Pac 12 First-Team by the AP, Coaches, and Phil Steele.