Between his sophomore and junior year, Turner, then 6'7", broke his ankle during the first spring game of AAU play, hurting his chances of recruitment, but soon recovered and gained some 30 pounds through two-a-day weight training regimen to improve his game. In his junior year, after fully recovering, Turner averaged 15.7 points, 12.87 rebounds and 8.64 blocks per game, leading Trinity to a 17–13 record and reaching the state playoffs for the first time in 10 years, and only the ninth time in school history dating back to the school's establishment in 1968. He also accumulated six triple-doubles.