I shared my experience with frostbite a few pages back.....https://www.backyardchickens.com/t/697050/michigan-thread-all-are-welcome/34980#post_16265188So Winter is here..Only worries I have are my Red's combs, the tips are black on one of them. My Brahmas seem ok with the cold weather so far, and my one Dom. hen as well. Thought I had enough Ventilation in the coop, but I am now worried. Any suggestions?