@ Ruraldocfarm20
Well, I think you would harvest them long before winter. You would really only need a wind shelter say a triangle shape building with an open front with a roost. People have used old dressers, plastic totes, children's playhouses. Old sheds, or outhouses. And some type of secure...
You can keep them together...until you can't keep them together. If you have a place that you can set up as a bachelor pad - get it set up sooner than later. Multiple roosters in a flock, need a plan B set up and ready to go.
Some cockerels will start harassing the pullets, can run them ragged...