Based on 2,338 research-grade iNaturalist observations in Massachusetts, Brown-headed Cowbird is most often recorded in May; in Massachusetts it behaves like a seasonal. It ranks #53 among birds recorded in the state in our data.
Molothrus ater
Brown-headed Cowbird in Massachusetts 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 Massachusetts in May
American Robin
Gray Catbird
Canada Goose
Baltimore Oriole
Red-winged Blackbird
Mallard
Wild Turkey
Northern Cardinal
Places to look in Massachusetts
Botanical GardenArnold Arboretum
Botanical GardenBoston Public Garden
Botanical GardenBerkshire Botanical Garden
State ParkHalibut Point State Park
State ParkHammond Pond Reservation
State ParkTolland State Forest
FAQ
When does Brown-headed Cowbird appear in Massachusetts?
Mainly April–June, with the most records in May.
How common is Brown-headed Cowbird in Massachusetts?
It ranks #53 by number of iNaturalist observations among birds in Massachusetts (2,338 records in our sample).