During his time in high school, Carter became a star track athlete and football player. His high school track and field career included nine Florida state titles, ten regional, district and county crowns and nine Cape Coast Conference titles. Carter won state titles in the 100 meters, 200 meters and 400 meters in back-to-back years (2003 and 2004), becoming the only athlete in Florida history to do so. His 45.44 from 2004 remains as the FHSAA (Florida High School) record. During both his junior and senior years, Carter was named athlete of the year for USA Track and Field, Nike, Gatorade and National High School Coaches Association, Track and Field. After his high school career, Carter played in the 2004 U.S. Army All-American Bowl and was named to USA Today's All-USA team. Considered a five-star recruit by "Rivals.com", Carter was listed as the No. 5 wide receiver prospect in the nation. Carter committed to Louisiana State University.