Frostbie What do I do?

[Shamo Hybrid]

You could put bigger diameter roost bars, that way their toes won't be hanging out in the air to get frostbitten.... it would be flat on the roost bar and their breast feathers will protect them.

 

[mimipeaches]

You could put bigger diameter roost bars, that way their toes won't be hanging out in the air to get frostbitten.... it would be flat on the roost bar and their breast feathers will protect them.

That is what we did. Their feet sit flat if they want and if they choose to they can have their feet hang off as well.

 

[Wyorp Rock]

Yes you are correct no wind comes in from that side. They don't have much light but they still seem to get around fine. We made sure that the other side is blocked up nice and tight. We put a bag of shaving up against that wall just in case anything comes in. And to keep them even warmer we put 5 bags of pine shavings down so it's super warm!

Well, they don't have to be super warm. Frostbite comes from moisture, cold and not enough ventilation. It can be from wind chill too.
Mine stood outside all day long the other day with the wind blowing - wind chill index was 0F Nighttime temps 11. I'm sure you are probably colder, but chickens can take cold, they just need some protection from the wind.

Did my rooster get nipped, yes I think he probably did, time will tell. Did his wattles get nipped, yes I think so - he gets them wet when he drinks water. But he is outside all day long.
At night, they need ventilation so moisture from their breath and droppings can move on out, not to mention ammonia.

https://the-chicken-chick.com/frostbit-in-backyard-chickens-causes/