Well, then you know what type of weather ours are dealing with. Yours should be fine.
Hey there. I was worried about my silkies and frizzles, they have a small coop area that I put 2 layers of cardboard all around the inside of to help them keep in the heat. The only added heat they had was a heated water bowl. Where abouts are you in this fine state of ours?
My bantam coop is insulated so it stays a bit warmer than my big pole shed where all my other chickens are. I see no frostbite in my bantam in winter, but I do get some combs hit in the larger uninsulated shed, as well as the occasional toe, so insulation helps quite a bit.