Hetzel initially attended Woodrow Wilson High School in D.C. and played for the Tigers in the 1958 season. He then transferred to Landon School in the Bethesda, MD. suburbs and was a 3 time All Met. As a sophomore, he averaged 20.5 ppg and 20.4 ppg as a junior. As a 3 time All Met in the Washington Daily News, he followed in the footsteps of Lew Luce and George Leftwich as the only 3-peats. He averaged 24.1 ppg in his senior season and finished with 1,210 points during his Bears career. On March 2, 1961, Undefeated Landon and DeMatha Catholic High School (ranked 1-2 in the city) faced off in Cole Field House before a crowd of 6400. Fred Hetzel led Landon that night with 18 points but it was the tandem of John Austin and Gary Ward that led the Stags to victory 57-52.