Eastern United States
Over most of the eastern two-thirds of North America, from central Canada southward, the Ruby-throated Hummingbird reigns supreme. Predominantly a neotropical migrant, it winters from southern Mexico to Costa Rica. Each spring, this species arrives in numbers along the Gulf Coast by early March, filtering northward over the next two months until arriving in northern states and southern provinces by late April or early May. Migrating males usually arrive a week or so before females at any given location. Climate change is affecting the migration of Ruby-throats, though. As conditions warm on the wintering grounds, data indicate that they leave their winter homes earlier on their way to the Gulf Coast. Interestingly, it also appears that hummingbirds then hang around in the Gulf Coast for longer than normal, perhaps to recuperate from their trip across the Gulf of Mexico.