Here is a bad picture of my large coop made out of the horse run-in last winter. It's hard to see, but on the right hand side you can see there's a triangle at the top - that's open to air on both sides, just covered with hardware cloth. Coop also has several vents and windows, which were open most of the winter. No frostbite there, no dead chickens.. =)
Oh, and I do deep litter. Shavings get changed out in April or so. =)
Happy chickens in the snow! =)

Oh, and I do deep litter. Shavings get changed out in April or so. =)
Happy chickens in the snow! =)