Mitchell scored 30 points on February 4, 2020, in a 73–67 loss to Rhode Island.[5] On February 22, Mitchell recorded 15 points and a freshman season-high 19 rebounds in a 57–49 win over Fordham.[6] In his final game of the season, on March 7, he posted a season-high 34 points and 12 rebounds in a 64–63 loss to Rhode Island.[7] As a freshman, Mitchell led his team with 17.7 points and 7.2 rebounds per game. He set a school freshman record for field goals and finished eight points shy of Jim McCoy's school freshman scoring record.[8] Mitchell was a six-time Atlantic 10 Rookie of the Week and won the award for the final five weeks of the regular season, the longest streak since Lamar Odom in the 1998–99 season. He also earned Atlantic 10 Rookie of the Year and Second Team All-Atlantic 10 honors, becoming the first UMass freshman to receive all-conference honors since Marcus Camby in 1994.[9]
Sophomore year (2020-2021)
As a sophomore, Mitchell averaged 18.8 points and 7.2 rebounds per game. He was named to the First Team All-Atlantic 10. At the end of the season he entered the transfer portal.[10]
Junior year (2021-2022)
Mitchell transferred to Texas after his sophomore season.[10] As a junior, he averaged 8.7 points and four rebounds per game. On February 15, 2022, the program announced that Mitchell would take an indefinite leave of absence from the team; he missed the rest of the season.[11]
Senior year (2022-2023)
Following the season, Mitchell again entered the transfer portal, and later committed to West Virginia.[12] As a senior, he averaged 11.7 points and 5.5 rebounds per game. After one season playing for West Virginia, Mitchell entered the transfer portal following the resignation of head coach Bob Huggins in June 2023.[13]
Graduate year (2023-2024)
Mitchell announced he was transferring to Kentucky in June for his final year of NCAA eligibility.[14]