Tonight it's suppose to be around -15 and the wind is blowing about 20-30 mph. My coop is a 8X16 shed converted into a coop and is pretty well draft free. I have it divided in half and at night I shut the inside door along with the outside door to keep my 10 birds in a smaller area with the belief that if they are kept closer to each other, they'll keep each other warm. They usually can free range during the day, but I keep them locked up at night. So, back to my question......how cold is too cold? I've had one heat lamp shining on their roosting area since it started freezing at night and since this artic front was suppose to come thru, I put another one in there that shines on the waterer and the area around it to hopefully keep it from freezing. Or at least keep good water for most of the night and I'll bring it in in the morning and refill it. They seemed happy and it was definitely warmer in the shed than it was outside when I went in to feed and water this afternoon but the temp hadn't dropped yet. Now it's about -5. Do you think they'll be ok? Or should I be worried? I don't want to wake up to frozen chicken.....at least not chicken that aren't in my freezer!