The summer, winter, and breeding ranges of the eastern bluebird differ primarily in how far south the bird reaches within each range. Eastern bluebirds nest from southern Saskatchewan, east across southern Canada to Nova Scotia, south to southern Florida, and south from eastern foothills of the Rocky Mountains from Montana, Wyoming, Colorado, and the Dakotas south to Texas. Bluebirds winter in the middle parts of eastern North America south into Mexico, the Gulf coast, and southern Florida.
Populations also exist in southeast Arizona and extend south to Nicaragua.