Lots of bears in NJ. My daughter lives in Andover - not far from the OP, and has bears crossing her yard almost daily.Bears in Jersey?
OP - electric fence around your run and coop. Put bacon strips on the hot wire so that the bear contacts it with his nose/mouth/tongue so that he gets 'educated'. Once they locate a food source they are persistent - especially this time of year when they are recovering from their winter 'fast'.