[1] As a junior, he missed time after being diagnosed with mononucleosis and suffering a ruptured spleen, which forced him to repeat the year.

The next season he was the starter at quarterback, leading the team to an 11-0 record and winning the NEPSAC Mike Atkins Bowl.

As a sophomore in 2019, he appeared in 10 whole games and played as the fourth tight end in 9 contests, behind Sean McKeon, Nick Eubanks, and Erick All.

He was used mainly for his blocking and was part of a unit that won the Joe Moore Award as the nation's top offensive line.

[9] In 2022, the starter at tight end All, appeared in the first three games (3 catches for 36 yards), before requiring back surgery, which opened the door for Schoonmaker to start for the rest of the season.

[15] He suffered an AC joint sprain to his left shoulder in the ninth game against Rutgers, which forced him to miss the next two contests.

He was forced to leave the College Football Playoff semifinal game against TCU in the second quarter, after suffering a right shoulder injury.

[18] On January 9, 2023, Schoonmaker announced he would forego his final year of collegiate eligibility and declared for the 2023 NFL draft.