I went out at 2am to check on the outside bantams & caved. The silkie seemed fine but the other 2 were puffed out & looked miserable. I brought the remaining bantams inside. They weren't happy being crammed into one cage (like battery hens) but they were at least warm. I kept them inside until 11am when the temp got up to 2'F. (Today's high will be 5) They'll be coming inside again tonight because the temps will be about the same. No signs of frostbite but as I recall it may take a couple days to look white or gray. They're in the run now eating & scratching around. I really wish they'd go up inside the heated coop area to warm up.