I only get frostbite on the big combed roos. I don't do anything but watch for infection.
If a hen gets frostbite in NC, you may not have enough ventilation.
It only got down to 0F here this year but in the past, it's gotten down around -20 and it's always humid. I haven't had frostbite on hens.
Same here... I don't do anything unless I see infection occurring. I don't think there is much
I can do- If I move the chicken out of the coop into someplace warm, this is not good for them if I put them back out into the cold after they heal. I heard that you shouldn't shock a chicken's system by taking them in and putting them back out in the cold. Their bodies get used to the warm (may even shed some feathers) and its a shock to them when you put them back into the cold.
Anyhoo... that is what I heard. So, just take it with a grain of salt as they say. And definitely watch for signs of infection and the chicken getting ill- listless, acting not themselves, staying still, sneezing, coughing, pus draining from wound.. etc. If those signs show, then I would bring them in someplace warm.
If you are concerned about the cold, it is true that some breeds do better in bitter cold weather than others. If you google that you will find some lists, I'm sure. Overall though, I think chickens handle cold better than heat. Their feathers are optimal in keeping heat in. Its like wearing a down comforter. I'm always worried about my flock when it reaches to below zero weather, but other than the long combed roos, they do just fine.
Just keep an eye on your hen's comb. You could put some neosporin on the frostbite- thin layer of it of course.