[3][4] He attended Saint Frances Academy in Baltimore, where he played basketball, baseball and football.

[6] Carrington also was a member of Team Melo in the Nike Elite Youth Basketball League travel circuit, being named the EYBL Breakout Player of the Session and second-team All-Session while helping the team reach a spot in the championships.

[8] As a senior at Saint Frances in 2022–23, Carrington helped the school have an overall record of 29–11 while going 11–3 in the Baltimore Catholic League (BCL); he was named first-team All-BCL and to the BCL All-Tournament team and averaged more than 26 points, seven rebounds, six assists and two steals per game.

[1] He also led Saint Frances to the Maryland Interscholastic Athletic Association (MIAA) tournament, which they won for the second time in his tenure, with Carrington being named to the All-Tournament team.

[4][15] On June 26, 2024, Carrington was selected with the fourteenth overall pick by the Portland Trail Blazers in the 2024 NBA draft.