Based on 2,418 research-grade iNaturalist observations in Delaware, Great Blue Heron is most often recorded in May; in Delaware it behaves like a year-round resident. It ranks #1 among birds recorded in the state in our data.
Ardea herodias
Great Blue Heron in Delaware by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Delaware in May
Red-winged Blackbird
Canada Goose
Osprey
Gray Catbird
Semipalmated Sandpiper
Blue Grosbeak
Common Yellowthroat
Willet
Places to look in Delaware
State ParkCape Henlopen State Park
Botanical GardenWinterthur Museum, Garden and Library
State ParkTrap Pond State Park
State ParkKillens Pond State Park
State ParkBellevue State Park
State ParkBrandywine Creek State Park
FAQ
When does Great Blue Heron appear in Delaware?
Mainly April–March, with the most records in May.
How common is Great Blue Heron in Delaware?
It ranks #1 by number of iNaturalist observations among birds in Delaware (2,418 records in our sample).