Massachusetts · Year-round resident

Brown-headed Cowbirds in Massachusetts

When cowbirds are present in Massachusetts, when they nest, which native Massachusetts plants feed them, and how to host them in a USDA 5a–7b yard.

Blackbirds (Icteridae)Brown-headed CowbirdMolothrus ater

Status in Massachusetts: Year-round resident
Nesting window: April–July
Broods: —
Hardiness zones: USDA 5a–7b

When to expect cowbirds in Massachusetts

Brown-headed Cowbirds live in Massachusetts all year. Snowy winters with nor'easters; Cape Cod is milder and holds more half-hardy birds. That makes the cold months the time your yard matters most to them.

Humid continental with maritime influence on Cape Cod and the islands.

Nesting in Massachusetts

Across Massachusetts, cowbirds typically nest from April–July. Plan around that window: March for setup, July for clean-out.

Warm summers; nesting peaks late May to July.

Brown-headed Cowbirds don't use nest boxes. Keep dense native shrubs and trees such as paper birch, sugar maple, red maple for nest sites.
Delay heavy pruning of shrubs until after July.

Native Massachusetts plants that attract cowbirds

Of the regional native plants we track for Massachusetts, these 8 provide food or cover cowbirds use:

Wild bergamot

Monarda fistulosa · Perennial

Tubular flowers for hummingbirds and seed heads for finches.

Black-eyed Susan

Rudbeckia hirta · Perennial

Prolific seed heads for finches and sparrows.

New England aster

Symphyotrichum novae-angliae · Perennial

Late nectar for insects and fall seed for sparrows.

Little bluestem

Schizachyrium scoparium · Perennial

Native bunchgrass; winter seed and ground cover for sparrows and juncos.

Tall goldenrod

Solidago altissima · Perennial

Insect-rich in fall and seed in winter.

Paper birch

Betula papyrifera · Tree

Catkin seed feeds redpolls and siskins all winter.

Sugar maple

Acer saccharum · Tree

Hosts hundreds of caterpillar species; spring flowers draw early insects.

Red maple

Acer rubrum · Tree

Among the first spring bloomers; early insects for returning migrants.

Feeding cowbirds through the Massachusetts year

Top foods: Millet, Cracked corn.
In Massachusetts's winter: Snowy winters with nor'easters; Cape Cod is milder and holds more half-hardy birds.

Full diet breakdown for cowbirds · Best feeder for cowbirds

Frequently asked

Are cowbirds in Massachusetts year-round?

Yes. Brown-headed Cowbirds are year-round residents in Massachusetts.

When do cowbirds nest in Massachusetts?

Nesting in Massachusetts typically runs April–July, with —. Clutches are up to 36 eggs per season, one per host nest, incubated for 10–12 days.

What native plants attract cowbirds in Massachusetts?

Wild bergamot, Black-eyed Susan, New England aster, Little bluestem, Tall goldenrod, Paper birch, Sugar maple, Red maple are native plants in Massachusetts that provide food or cover for cowbirds.

Other backyard birds in Massachusetts

Northern Cardinal Eastern Bluebird Black-capped Chickadee Purple Martin Downy Woodpecker Hairy Woodpecker American Goldfinch Tufted Titmouse White-breasted Nuthatch House Wren House Finch Purple Finch Ruby-throated Hummingbird Carolina Wren Mourning Dove American Robin Dark-eyed Junco White-throated Sparrow Song Sparrow Chipping Sparrow Red-bellied Woodpecker Northern Flicker Pileated Woodpecker Yellow-bellied Sapsucker Red-breasted Nuthatch Brown Creeper Common Grackle Red-winged Blackbird Baltimore Oriole Rose-breasted Grosbeak Evening Grosbeak Pine Siskin Common Redpoll Indigo Bunting Eastern Towhee Gray Catbird Northern Mockingbird Brown Thrasher Cedar Waxwing Tree Swallow Barn Swallow Eastern Phoebe Chimney Swift Yellow-rumped Warbler Pine Warbler Eastern Screech-Owl Wood Thrush Great Crested Flycatcher Eastern Kingbird American Tree Sparrow House Sparrow European Starling Fox Sparrow American Crow Cooper's Hawk Sharp-shinned Hawk Red-tailed Hawk Barred Owl Great Horned Owl American Kestrel Wood Duck Wild Turkey Mallard Great Blue Heron Belted Kingfisher Scarlet Tanager Eastern Meadowlark Golden-crowned Kinglet Hermit Thrush Winter Wren Pine Grosbeak Red Crossbill Field Sparrow Gray Catbird Lark Sparrow Hooded Merganser Yellow Warbler Common Yellowthroat American Redstart Black-and-white Warbler Ovenbird Yellow-breasted Chat Red-eyed Vireo Warbling Vireo Eastern Wood-Pewee Least Flycatcher Cliff Swallow Northern Rough-winged Swallow Bank Swallow Common Nighthawk Eastern Whip-poor-will Canada Goose American Coot Killdeer Spotted Sandpiper American Woodcock Green Heron Great Egret Black-crowned Night Heron Turkey Vulture Osprey Bald Eagle Red-shouldered Hawk Merlin Peregrine Falcon Northern Saw-whet Owl Black-backed Woodpecker Savannah Sparrow Swamp Sparrow Vesper Sparrow Snow Bunting Horned Lark Common Redpoll Hoary Redpoll White-winged Crossbill Bohemian Waxwing Yellow-billed Cuckoo Bobolink Rock Pigeon

Sources

Timing reflects typical patterns for the region as a whole; local dates vary with elevation and year. Check the linked eBird bar charts for your county.