Based on 12,651 research-grade iNaturalist observations in Maryland, Great Blue Heron is most often recorded in May; in Maryland it behaves like a year-round resident. It ranks #2 among birds recorded in the state in our data.
Ardea herodias
Great Blue Heron in Maryland 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 Maryland in May
Canada Goose
American Robin
Red-winged Blackbird
Gray Catbird
Northern Cardinal
Mallard
Eastern Bluebird
Osprey
Places to look in Maryland
State ParkWashington Monument State Park
State ParkPatapsco Valley State Park
State ParkSeneca Creek State Park
State ParkCalvert Cliffs State Park
State ParkSusquehanna State Park
State ParkGambrill State Park
FAQ
When does Great Blue Heron appear in Maryland?
Mainly April–March, with the most records in May.
How common is Great Blue Heron in Maryland?
It ranks #2 by number of iNaturalist observations among birds in Maryland (12,651 records in our sample).