Most of the ponds and smaller lakes are iced over up here. Not sure how thick the ice is though. I wouldn't go out on it yet. May be ok in a few weeks. You might want to check with the NH fish and game department on ice conditions. We are supposed to get a big snow storm this weekend. THis added blanket of snow will cover up and soft areas in the ice. Be extra careful if you go.
There are a 2 recreational smelt fishing places that I drive by everyday on a large river. I know they can't wait to get some shacks on the ice. I bet one place will have some shacks out this weekend, even though the river is still open in the middle.