My 5 chickens have a coop with an attached run that has a roof and is covered with plastic on 3 sides but has an opening on one side under the coop for ventilation. We are having our first cold front tonight and tomorrow with a high of 4 and -32° windchill. Do I still allow them to venture into their run tomorrow if they want to? Or do I not even let them choose cause its so cold? I attached a picture of the coop and run so you can see what I'm taking about. I am so worried about them since this is our first winter and its so cold and I love them so dang much.