York attended Orange Lutheran High School in Orange, California. He averaged 24.9 points, 4.8 rebounds, 2.7 assists, and 2.3 steals per game as a senior where he became the all-time leading scorer of the school. He was rated as the No. 46 overall prospect and No. 11 shooting guard in the class of 2012 by Rivals.com and a scout grade of 93 by ESPN. He signed to Arizona on July 10, 2011.
