The chickens do just fine in the cold. A few tips we have learned: Supplement light a little in the morning/evening with an LED bulb to keep egg production going through the winter. Keeping their feet dry is important, so as long as you get a waterer that prevents them from stepping in the water, then they should be fine. They do seem to roost longer and lay a little less when it is -20 and colder for longer periods. You also need to check on eggs frequently as they freeze and crack quickly. They eat a bit more feed than the rest of the year because they cannot forage through the snow and they burn more calories to stay warm. Don't use a heat lamp, unless you want a barn/coop fire and a high electric bill. Feel to message me or my wife anytime if you have questions!