Just checking in to see what you decided. I live in PA, and we're had lows in the 40s and I've had my 8week old chicks out for a week now. The last two nights it went below freezing so I closed their coop @ night to keep the warmth in. I normally don't close it since they are in a run that I did my best to make it "predator proof" They all are "full feathered" but you can tell there are some that mind the cold more than others. They'll hang in the coop longer, but in general they don't seem to mind it at all once the sun pops out.
