Uh, depends on the size of the hay loft! The barn with hay loft I saw growing up seems to have been good for the whole winter, and that was on a dairy farm. A

Uh, depends on the size of the hay loft! The barn with hay loft I saw growing up seems to have been good for the whole winter, and that was on a dairy farm. Another approach on such a farm was a silo, a tall cylinder.