Based on 2,528 research-grade iNaturalist observations in Maryland, Tree Swallow is most often recorded in May; in Maryland it behaves like a seasonal. It ranks #47 among birds recorded in the state in our data.
Tachycineta bicolor
Tree Swallow 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
Great Blue Heron
Mallard
Eastern Bluebird
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 Tree Swallow appear in Maryland?
Mainly April–June, with the most records in May.
How common is Tree Swallow in Maryland?
It ranks #47 by number of iNaturalist observations among birds in Maryland (2,528 records in our sample).