The White Sox promoted Montgomery from Double-A Birmingham to Triple-A Charlotte on Sunday, James Fegan of SoxMachine.com reports.
Montgomery will move up a level in Chicago's minor-league farm system after slashing .313/.429/.606 with six home runs and two stolen bases over 126 plate appearances with Birmingham to begin the season. Viewed as one of the organization's top prospects, the 23-year-old Montgomery could have a shot at making his MLB debut later this summer if he can keep his strikeouts in check during his time at Triple-A.