DT, 6-2, 320, El Dorado, Ark. (El Dorado HS)
Jackson was ranked as the No. 1 prospect from Arkansas by ESPN and 247Sports Composite rankings. 247Sports Composite ranked him as the No. 5 defensive tackle in the country, while ESPN tabbed him as the nation's No. 6 defensive tackle and Scout.com ranked him as the No. 4 defensive tackle prospect in the country. He participated in the 2014 US Army All-American Bowl, recording two tackles to help the West to a 28-6 win. He helped lead El Dorado to a 6A state championship and a 13-1 record during his sophomore season as he recorded 47 tackles, including eight for loss and two sacks. During his junior season he recorded 67 tackles, including 12 for loss and six sacks, and earned all-state honors. In 2013, he helped lead El Dorado to another state title, the school's fourth in five years, by recording 61 tackles, including 14 for loss, with one interception. He finished high school with 175 tackles in his career. He was named to the Hawgs247 all-state team for the Class of 2014 and was twice named academic all-conference. He was coached at El Dorado by Scott Reed. Jackson received numerous offers and chose Arkansas over Alabama and Ole Miss.