I've had Silkies and never had a problem with them in the cold even below temps. They just snuggle within each other and warm as they can be! Like one said, they look like a pile of dirty clothes!

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is your coop insulated? I live in NS too and I am finishing up my coop for my first silkies, and I'm wondering if I should insulate the coop or not for them. I'm not using any heating. I have only a smaller flock to, I'm only getting 4 or 6 to start than let them hatch eggs on their own this spring coming.We live in northern Nova Scotia, which would have colder winters than most parts of the U.S. Our silkies are at least as winter hardy as our other birds. Their coop is unheated, though not drafty. No cold-related fatalities.
Unless it is bitter cold, we open the coop door during the days, and let the birds decide if they want to go outside. On days that the other birds won't step outside, the silkies will still go out, and I see them scratching in the snow looking for food.
Their feet also are better snowshoes than the other birds.