Buckner was selected by the Los Angeles Dodgers in the second round of the 1968 Major League Baseball draft; his friend Bobby Valentine was the Dodgers' first-round pick. Upon signing with the Dodgers, Buckner was assigned to the Ogden Dodgers of the Pioneer League. He also briefly attended Los Angeles Valley College, USC and Arizona State University. He became a member of the Sigma Chi fraternity while a farmhand with the Dodgers, and roomed with Valentine while attending USC after his first professional season.