It will be interesting to find out how many roosters/cockerels with gigantic combs survive frost bite. It was only 28 degrees in Chicago last night with wind chills of 14 and my cockerel's comb tips were slightly blue. However I do have my coop open from 1 end at the moment. Last year I closed that when it got below 20 but I did not have any large comb birds last year. Lets see!Sorry for the confusion. The pen overall is 16' wide, 4' deep, then 8' at the front sloping to 6' at the back. There are plywood sheets around the bottom that go 4' up. The other 2-4' is just 1" chicken wire. The top is sheet metal.