It's hard to say. My recommendations are for large fowl, cold hardy breeds. I would not own a chicken that's not cold hardy because of my climate. Adding the fact that they are old and frail, they are definitely more susceptible to having problems through the winter. No guarantees there.I'm worried about my cream-puffs. They are in our barn, so out of the elements, but it gets frigid in the barn, too. Now I wouldn't be worried of these were big, healthy chickens. But our chicken breeds are notoriously non cold-hardy. And on top of that, most of them are very old and frail. Will they be alright?