Your Passport 40 is a beauty and hope you get to fully enjoy her this summer. I wouldn't worry about a little ice in Maryland - will melt soon enough.
But, I'm sure you are aware of the damaging effects of extended, sub-zero temps and freezing/expansion issues up in the Albany, Lake Champlain area - that's when you begin to worry about the ice element.
True Blue . . .
sold the Nauticat