We've had our share of snow here in NH and it's my first winter with chickens. Is it normal that they refuse to come out of the coop AT ALL with snow on the ground? Normally they free range all over the yard and I'm going through a lot of feed here. I'm also concerned because I designed the coop size with the idea that they would be sleeping in it and living outside of it. It's kinda cramped. (4x8 for 11 chickens) How can I get them out?