Fuld attended Berwick Academy as an eighth grader, during which time he made the high school varsity, and the University of New Hampshire's baseball coach said that he had the best batting swing of any player in the state. He was the team's MVP, and a league All Star. He then transferred to Phillips Exeter Academy in New Hampshire, where he played baseball and soccer, and ran track. Because of the climate, the league played a short baseball season, and some of the games were played as it snowed. Fuld batted .613 as a freshman, and .489 as a sophomore with 11 steals. He led his club to a league title as a junior in 1999, as he batted .600 with 9 steals. As a senior, he hit .550 with 6 homers, 12 RBIs, and 13 stolen bases. He was a three-time team captain and four-time MVP of the varsity baseball team.