Migration is underway. The Fall and Spring are great for Bird watching as you never know who might stop in. I live on a flyway (Savanah River) and Blue Ridge Mountains.
My yard is loosing birds. I may have more types of birds in Summer, but the numbers of birds are much larger in Winter. It is not even close.

In many ways Spring Migration is better for us as the trees are mostly void of leaves and birds are exposed.