In high school, he played linebacker, defensive tackle and offensive guard, while also competing in swimming and track Won a state championship with another current Green Bay teammate, Roy Manning
Humphrey was a four-year starter for Central Michigan. He initially began playing as a defensive end, but was moved to tight end during his freshman season. As a true freshman in 2001, Humphrey played in 11 games, averaging 21.5 yards on 11 catches with three touchdowns. Due to his solid play, he was named to the Freshman All-America team by The Sporting News in 2001. He continued his success as a sophomore in 2002. He saw action in all 12 games while grabbing two TDs and 276 yards on 22 receptions. In his junior year, he played in 10 games in 2003, notching two touchdowns among 14 catches for 212 yards. Than in 2004, as a senior, he caught eight passes for 137 yards (17.1 avg.). Throughout his career at Central Michigan University, Humphrey caught 68 passes for 862 yards and seven touchdowns.