Green attended Summerville High School, where he was a three-sport athlete in football, basketball, and track. He played as a wide receiver for the Summerville Green Wave high school football team, under coach John McKissick. He was widely considered to be one of the top national football prospects of the Class of 2008, and was listed #1 by "Sports Illustrated". Green earned All-State honors four times and was the only junior nominated to the 2006 "USA Today" All-American first team following 75 receptions for 1,422 yards and 16 touchdowns during his sophomore season. Green was also selected as a member of the Rivals.com Junior All-America team based on those stats. As a freshman, he had 57 receptions for 1,217 yards and eight touchdowns. As a sophomore, he had 60 catches for 1,203 yards and 14 touchdowns.