I'm in central Maine. The lows go any where from 10 degrees to 25 below, and sometimes lower than that. It's a good winter day if the temp gets up to 20 degrees.
Wow. Well I think mine will be fine then here in Ok! I was worried the other night bc it dropped to lower twenties and they are in an open air coop. No henhouse and no heat lamp. They were all fine next am, just frozen water which I quickly fixed. Like I said my neighbor's. is just like mine but I was still fearful of them freezing. I did notice at least one of them had roosted in a nesting box as it was full of droppings! I guess the straw was warm.