When do hummingbirds leave Kansas?

Hummingbirds typically leave Kansas in the fall, around late September to early October, as they migrate south for the winter. The exact timing can vary slightly each year depending on weather conditions and food availability. Ruby-throated hummingbirds, the most common species in the eastern United States, are usually the last to depart. It's a good idea for bird watchers to keep their feeders up until the end of October to support any late migrants.