Sorry to even have to ask this question. But, I've read up a lot about winter preparations for the hens and now I'd like to know when I should put the girls inside. Let me explain what I have then go from there. I have a run and a coop. There is a roof over the open air coop, but otherwise the girls are very exposed to the elements. I have just finishing building a winter coop. Not heated. However, I've put some windows on it and wrapped tarp around one side of it. It is of reasonable size for 4 girls and should stay a bit cozy. It is not connected to the run. I generally leave for work before sunrise. So, I'd think when I put the girls in the inside coop they're going to have to stay put for the day since it will be the coldest time of day when I leave. I get home around 4:00 in the afternoon and let them run free until dark. Let me get the question here. I live in Maryland. Winters can have high temperatures anyhwere from the teens to the sixties. Lows can be from zero to forty. I'd think I'd want to leave them if the low is thirty and the high is going to be in the forties. I don't know. At what temperature range should I lock them up inside? Thanks for the help.