Submitted by ProfessorMandark t3_10qc9gh in Maine
I've never had chickens in severely low temps, and I want to ensure they stay safe. They are semi-protected from wind, and they don't have any open areas in the coop they stay in at night, but if it's that cold, I can't imagine they'll want to leave the coop, and I don't know if it's ok to leave them in there for so long.
MrBudlee t1_j6p6wyg wrote
Making sure they have fresh water and a draft free coop is the biggest concern. If you don’t have a water warmer just be prepared to have fresh water on hand.
They will huddle together and warm up the coop just fine. For extra measure you can rub Vaseline to the combs to prevent frost bite. I’ve never seen the need for the heat lamps inside the coop. They can tolerate the cold extremely well, although some breeds not so much.