Thomas attended West Laurens High School in Dexter, Georgia, where he was a three-sport star in basketball, football, and track. He played as a wide receiver for the Raiders football team under the direction of then head coach John Kenny. As a junior in 2004, he recorded 32 receptions for 330 yards and three touchdowns. Thomas was named an all-region and all-Heart of Georgia player. The following season, he recorded 82 receptions for 1,234 yards and ten touchdowns. After the game, he participated in the North-South All-Star game. Thomas was again selected as an all-region and all-Heart of Georgia, and the Atlanta Journal Constitution named him to its Class AA all-state first team and PrepStar to its All-Region team. Scout. com assessed him as the 22nd-ranked college prospect in the state of Georgia, and Rivals. com rated him the 34th-ranked such prospect. He received scholarship offers from Duke, Georgia, and Georgia Tech.