After moving from South Carolina to Dallas, Texas, Evans starred at Justin F. Kimball High School in his Junior and Senior year, where he was named to the Parade All-America team and the McDonald's All-American Game in 2015. He chose Oklahoma State over Illinois, USC and Texas, among others. In the Summer before his freshman year at Oklahoma State, Evans played for the United States in the FIBA Under-19 World Championship in Greece, where Team USA won the championship by defeating Croatia in overtime.