This is the first year I've had chickens and I live in Ontario. We built them a coop but we haven't locked them in yet. They are able to go between their coop and their run. We've had snow now for over a week and the temperature has reached -10 but they seem to be doing ok so far. Still laying, eating and drinking like normal. We do have a water heater so the water doesn't freeze though. We're planning on putting a heating pad up against the wall eventually as tempuracture will get to -30 at times.