Turner attended Mounds View High School in Arden Hills, Minnesota. He was an all-state lineman for the Mustangs, helping compile a 26-8 record, winning section titles, and advancing to state playoffs all three years during his career.
Turner attended North Dakota State University from 2010 to 2013. In 2010, Turner started in 12 games. He started 14 games in 2011. In 2012, Turner started in 15 games and was named to the all-Missouri Valley Football Conference first team. In 2013, he made all 15 starts at left tackle and was responsible for zero quarterback sacks. He was named All-Missouri Valley Football Conference first team and two-time Offensive Lineman of the Week. He was a consensus FCS All-American in 2012 and 2013 and was part of three FCS national championship teams. He participated in the 2014 Senior Bowl. He was one of the top small-school prospects of the 2014 NFL Draft.
Projected a second-to-third round selection by CBS Sports, Turner was the highest selected North Dakota State player since Lamar Gordon in 2002. He was drafted in the third round (67th overall) by the Miami Dolphins.