[1] He attended Wilkinson County High School where he won four varsity letters as both a football and basketball player.
[2][3] He won the starting job as a sophomore and threw for over 5,000 yards in two seasons before missing his senior year due to injury.
[1] As a true freshman at Jacksonville State in 2018, Grable redshirted while transitioning to tight end.
[4] He then began transitioning to the offensive line in 2019 and won a starting role at left tackle in 2020, earning first-team All-Ohio Valley Conference (OVC) and second-team FCS All-America honors.
[6] He started all 14 games for the team that year and was named third-team All-American Athletic Conference (AAC) by Pro Football Focus.