It was -9 here in CT last week one morning and I noticed my rooster Spock's comb starting to turn black on the tips. The coop got down to a balmy 15 degrees that night. I have never had an issue with frostbite before in 4 winters of keeping chickens in the same coop except for a few single comb hens that lost the very tips. I have 23 hens and 1 rooster. Their coop is 15' x 16'. My coop doesn't smell like ammonia and I fluff up the bedding every morning and put some fresh chips down. Then I do a complete clean out in the winter every four weeks. On the below zero wind chill days I have been keeping my chickens inside. When it is this cold my chickens look outside and refuse to go out anyway! Is it possible that because a chicken grows up in a warmer climate that it's comb is not as resistant to frostbite as a chicken who grows up in Canada or Alaska? Even if the chicken's are the same breed? I see pictures of other people's chickens running around in the snow and it's amazing to me. Until I shovel and put hay down, none of mine will go outside if there is even a dusting of snow. Last night it was 10 degrees outside (and - wind chill), 16 degrees in the coop. This morning I noticed two blisters underneath the blackish areas on Spock's comb. How bad is Spock's frostbite? What do I need to watch out for? Are the blisters a sign of infection to come or just what happens...like with a regular burn. Thanks for your help!!!!!!!!!!!! Spock: Spock's blisters: 3 year old Ancona hen with no damage to comb this year. When it is cold or rainy she almost never goes outside. She did lose a couple points of her comb last winter.