Most geese are quite cold hardy. I live in Michigan and my geese (Pilgrim and Sebastopol) stay out all winter. They have a shelter that they rarely use. One of the smaller Sebastopols would go into the three sided shelter if it was windy. Sebastopols may be a little less cold hardy than most geese because their feathers don't lay as flat as typical breeds. I kept the water in the pond from freezing by keeping the water running with a pump and adding fresh running water to the pond constantly. They would go in the water to swim no matter what the temperature.