I am new to chickens since June and I do allow mine to free range. My current set up is a stall in the barn as their coop. Do you let your chickens free range in the winter? I am worried about their feet getting frost bitten. I could let them out of their coop in the winter because they have full access in the barn so they wouldn't feel so cramped up?? Do they know to come in and find shelter if it gets too cold & nasty out?