Juvenile. What us "old-school" field herpers would call the "Coastal Plains" Milksnake (Lampropeltis triangulum "temporalis"). See Observation Fields for more information on this "forgotten subspecies".
Vicinity of Laurence Harbor, New Jersey.
I just love these little guys. Look at that face!!! The best picture I have of this is the first one. The others are somewhat blurry. It was constantly on the move.