Nope, they're not here yet, but they're coming! Here is a great map of the approximate time they'll start showing up in our backyards.
"Although there are differing views in the birding community as to what triggers the start of migration, it is generally thought that hummingbirds sense changes in daylight duration, and changes in the abundance of flowers, nectar and insects. Instinct also plays a role in making the decision to migrate." www.hummingbirdcentral.com/hummingbird-migration.htm
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