Bluebird, time to migrate

This morning we had a lone Eastern Bluebird fly over our field, as an adult Bald Eagle looked out from its perch across our lake. We had the first snow here on Sat. and the temps are colder. Made us think the bluebird really needs to migrate south now.
Eastern Bluebirds can remain in more northerly areas during winter months, where they survive by eating berries, such as sumac, and roost in bird houses or tree holes at night. But most head to more southern U.S. areas to warmer, gentler weather. We have seen bluebirds wintering in GA and FL. By March bluebirds usually return to our yard. We'll have the bluebird houses cleaned out and waiting.