Green herons have a wide range in North America, but are generally found near wetlands. They occur as far north as southern Canada and as far south as northern South America. They are found throughout the eastern United States as far west as North Dakota and the Great Plains states, although some sedentary populations occur on the west coast. During the breeding season they are found primarily in the eastern United States, with some populations in the Pacific Northwest as well. Non-breeding individuals are found in Mexico and Central America, Texas, southern New Mexico and Arizona, and the Caribbean islands. Small vagrant populations winter in Hawaii and the United Kingdom. Some populations migrate and others are sedentary populations. Sedentary populations occur along the east and west coasts of the United States and Central America. Most populations in North America, however, are migratory. After breeding they disperse southwards, in mid-September. Spring migration occurs from March to April, an earlier arrival than most other herons. (Davis and Kushlan, 1994; Hancock and Kushlan,1984)
Biogeographic Regions: nearctic (Native ); oceanic islands (Native )
- Davis, W., J. Kushlan. 1994. The Green Heron. The Birds of North America.
- Hancock, J., J. Kushlan. 1984. The Herons Handbook. New York City, NY: Harper and Row Publishers.
- Hancock, J. 1999. Herons and Egrets of the World. London, UK: Academic Press.