I have 2 hens and 1 rooster. I have a small coop with an attached run that is then surrounded by a very large dog pen. The coop has no place for the birds to roost so they sleep outside on top of the run and are doing fine. They do this even when it is 20 degrees outside. When I go out to supply new water and feed in the morning they are frisky and running around but usually have frost on their backs! Anyway, my concern is that here in Middle TN in the next few days it is going to be very cold. The low on Monday night is supposed to be around 1 degree. Are my birds going to freeze to death? Should I close them up in the coop? Should I try to hurry and build a new shelter with a roost in it? Any advice from anyone is greatly appreciated! Thank you!