The coop I have has a run area and a sheltered indoor area as shown below
You can see some open areas in the top (just under the roof) but I have sealed them off with sheetrock foam. We have had nights go down to 27 or so and I haven't noticed any frostbite. But when I got home from work today I noticed SEVERAL chickens has black tips on their combs. It was very windy last night but only got down to 34 but it was also windy this morning...could the wind have done this when they were outside this morning?

You can see some open areas in the top (just under the roof) but I have sealed them off with sheetrock foam. We have had nights go down to 27 or so and I haven't noticed any frostbite. But when I got home from work today I noticed SEVERAL chickens has black tips on their combs. It was very windy last night but only got down to 34 but it was also windy this morning...could the wind have done this when they were outside this morning?