So, have read most threads regarding cold weather strategies for hens. I agree the RIR's are very hardy birds and seem to do well in the Maine winters. However, I only have 3 hens and collectively they are not producing much body heat. Last winter, when they were still pretty young, not fully feathered, I made them go inside their smallish hen house for the night (rather than staying on a roost in the coop) when night temps got down to single digits. They were crowded, some feathers got bent but they did stay warm. Now they are past a year old but I do wonder about the danger of frost bite. We have some pretty cold nights slated for next week. Should they be forced inside their laying house or left to fend for themselves on a roost in an unheated, uninsulated coop?