Langerhans made his professional debut in 1998 with the rookie-level GCL Braves of the Gulf Coast League. He batted .277 with 41 hits, 10 doubles, 4 triples, 2 home runs, and 19 RBIs. In 1999, Langerhans was promoted to the Class-A Macon Braves of the South Atlantic League. In 121 games, Langerhans batted .268 with 120 hits, 30 doubles, 1 triple, 9 home runs, 49 RBIs, and 19 stolen bases. In 2000, Langerhans was assigned to the Class-A Advanced Myrtle Beach Pelicans of the Carolina League. He appeared in 116 games with the Pelicans and batted .212 with 14 doubles, 7 triples, 6 home runs, 37 RBIs, and 25 stolen bases. Langerhans's 7 triples was tied for third most in the league with Choo Freeman (7), was and behind Damione Merriman (9), and Chone Figgins (14). Langerhans continued playing with the Class-A Advanced Myrtle Beach Pelicans in 2001. He batted .287 with 30 doubles, 3 triples, 7 home runs, 48 RBIs, and 22 stolen bases. In 2002, Langerhans was promoted to the Double-A Greenville Braves of the Southern League. He batted .251 with 23 doubles, 2 triples, 9 home runs, and 62 RBIs in 109 games.