I am concerned that the winter may cause an issue for the chickens as the coop I bought is low tot he ground with an equally low run, so I am making preparations now. We seem to get a lot of snow in Massachusetts and one good storm would cover the coop. It is about 3 feet high by 10 feet long. I was thinking of putting a greenhouse around it with chicken wire to create a larger run for the girls. Any advice is helpful. Thank you.