Mitchell was the 2017 VHSL 2A Offensive Player of the Year and helped guide Union to a trip to the 2A semifinals this season under the watch of head coach Travis Turner. He was a four-time all-state tight end and a USA Today All-Virginia First-Team selection. Mitchell Racked up 756 receiving yards on 42 catches and nine touchdowns in his career. He was also a two-time first-team all-conference pick as a basketball player.