I know someone here in CT who free ranges and her birds are out all day in the extreme weather and has not lost any to the cold yet (knock on wood) they can tolerate quite a bit once they get use to it. Young ones will need the heat in the winter just in case. If anyone has young birds like around 6-8 months I would include a heat lamp. If the power goes out bring the young ones inside to keep warm. All my birds go into the shed at night in the winter, none choose to stay outside, don't know why but they all go in. In winter all my birds are together in the pen, none are seperated so when they are locked up their body heat heats the shed. I get frost on the inside walls in the morning but it is still warm inside the shed.
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