The population size may be small, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). Most of the Canadian population of this species is here only during the breeding season. When observing Great Blue Heron rookeries, please keep in mind the 1000-foot disturbance buffer zone. Fascinatingly Fabulous Facts About the Great Blue Heron.
For these reasons the species is evaluated as Least Concern. Click here to visit this species' account and breeding-season distribution map in Sound to Sage , Seattle Audubon's on-line breeding bird atlas of Island, King, Kitsap, and Kittitas Counties. It is difficult to estimate population size for the Great Blue Heron fannini subspecies because colonies are not stable: herons have a tendency to leave the colony following a disturbance. The best available estimates suggest that the Pacific Great Blue Heron population size in Canada is 4000-5000 nesting adults. by Mike Aurelia Connecticut’s waters are all free of ice this winter, which means that birds that need open water to forage are likely to be more common and widespread, including Great Blue Herons. When rivers and lakes begin to freeze up in the late autumn, herons head south, though some living on the Pacific and Atlantic coasts stay year-round. Breeding populations along the Coastal Lowlands were eliminated in New York.

Great Blue Heron populations decreased during the late 1800s and early 1900s, mostly due to shooting and habitat loss. Within the Great Lakes region, central Minnesota supports relatively high densities of breeding birds (Figure 1).
Today the Great Blue Heron has reoccupied much of its former range but likely at smaller population levels than in the past (Vennesland and Butler 2011). Population size has been difficult to estimate for the Pacific Great Blue Heron because colonies are not stable and are difficult to track in a standardized fashion. Great Blue Heron Ardea herodias. Great blue herons are Canada’s most widespread heron, and are found from the Maritimes to British Columbia. The best available estimates suggest that its population in Canada is 4000 to 5000 nesting adults, nearly half of its global population. One of the largest and common herons in North America, the tall, long-legged Great Blue Heron is easily spotted along the shores or edges of small inland ponds.

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