Hi- This is our first year trying to winter our small flock of two hens. We live in southeastern wisconsin. Currently we house them in a dog crate (2'x3') in our garage at night to ward off predators. Then each morning we take them outside to our run where they have more space to hang out all day long. Is this viable for the winter? Is there a minimum temp where we should keep them indoors for that day? What if there is a string of cold weather for several weeks...do we keep them indoors in that tiny cage the whole time? I would feel bad doing that, but maybe I'm just overly concerned about their space needs and they would be perfectly fine. This is a picture of our run.