I got my first BA's in May 2012, a critter got most of them, and I had 3 going into last winter, they did well. Except a flash freeze came in Christmas night when I wasn't home to close the north front door on the coop, and I lost a hen to the sudden cold. It is colder here today than it was last December. My 2 older BA's are in a stout coop on the lot with the other old birds, they moved when they went broody and when I put a dozen pullets in the backyard run/coop. Those 2 I think will winter just fine, even though tomorrow's high is 23. In the backyard coop I have 3 production reds, 3 americauna and 6 black australorps, all around 8.5 months old. The BA's quit laying when it got cold, they had just started, I think they do lay an egg now and then. But my big concern is will they make it through the teens tonight and the 20's tomorrow, teens tomorrow night, finally thaws out on Sunday. I have closed the north front door, sealed off the front to block drafts, and they have been sleeping in the coop. I have a chick/pullet pen in my green house, 7 ft long, 2 ft tall 2 ft wide, temp around 50. I can move the BA's in there, or I can leave them in the main coop where temps will probably be near 25 to 30. Which is better?