Arizona · Year-round resident

Brown-headed Cowbirds in Arizona

When cowbirds are present in Arizona, when they nest, which native Arizona plants feed them, and how to host them in a USDA 4b–10b yard.

Blackbirds (Icteridae)Brown-headed CowbirdMolothrus ater

Status in Arizona: Year-round resident
Nesting window: March–July
Broods: —
Hardiness zones: USDA 4b–10b

When to expect cowbirds in Arizona

Brown-headed Cowbirds live in Arizona all year. Low deserts stay mild and host many wintering sparrows and hummingbirds; the high country gets snow. That makes the cold months the time your yard matters most to them.

Hot Sonoran and Mojave deserts in the south and west, with pine-oak sky islands and the Colorado Plateau rising above 7,000 ft.

Nesting in Arizona

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

Summer highs above 110°F in Phoenix and Tucson make water the single strongest attractant; the July monsoon triggers a second breeding pulse.

Brown-headed Cowbirds don't use nest boxes. Keep dense native shrubs and trees such as rabbitbrush, palo verde for nest sites.
Delay heavy pruning of shrubs until after July.

Native Arizona plants that attract cowbirds

Of the regional native plants we track for Arizona, 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.

Common sunflower

Helianthus annuus · Perennial

Annual native sunflower — the original feeder seed.

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.

Rocky Mountain bee plant

Cleome serrulata · Perennial

Nectar-rich in summer, seed for finches in fall.

Rabbitbrush

Ericameria nauseosa · Shrub

Late-season bloom supports insects; seed for sparrows.

Palo verde

Parkinsonia florida · Tree

Seed pods and insect-rich spring bloom.

Feeding cowbirds through the Arizona year

Top foods: Millet, Cracked corn.
In Arizona's winter: Low deserts stay mild and host many wintering sparrows and hummingbirds; the high country gets snow.

Full diet breakdown for cowbirds · Best feeder for cowbirds

Frequently asked

Are cowbirds in Arizona year-round?

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

When do cowbirds nest in Arizona?

Nesting in Arizona typically runs March–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 Arizona?

Wild bergamot, Black-eyed Susan, Common sunflower, Little bluestem, Tall goldenrod, Rocky Mountain bee plant, Rabbitbrush, Palo verde are native plants in Arizona that provide food or cover for cowbirds.

Other backyard birds in Arizona

Northern Cardinal Eastern Bluebird Purple Martin Hairy Woodpecker American Goldfinch White-breasted Nuthatch House Wren House Finch Mourning Dove American Robin Dark-eyed Junco Song Sparrow Chipping Sparrow Northern Flicker Red-breasted Nuthatch Brown Creeper Red-winged Blackbird Evening Grosbeak Pine Siskin Indigo Bunting Gray Catbird Northern Mockingbird Cedar Waxwing Tree Swallow Barn Swallow Yellow-rumped Warbler House Sparrow European Starling Steller's Jay Woodhouse's Scrub-Jay Mountain Chickadee Bushtit Juniper Titmouse Pygmy Nuthatch Anna's Hummingbird Black-chinned Hummingbird Broad-tailed Hummingbird Costa's Hummingbird Lesser Goldfinch Cassin's Finch Spotted Towhee Canyon Towhee Gambel's Quail Western Bluebird Mountain Bluebird Say's Phoebe Black Phoebe Gila Woodpecker Ladder-backed Woodpecker Cactus Wren Curve-billed Thrasher Verdin Pyrrhuloxia Bewick's Wren White-crowned Sparrow Violet-green Swallow Black-headed Grosbeak Lazuli Bunting Bullock's Oriole Eurasian Collared-Dove White-winged Dove Inca Dove American Crow Common Raven Cooper's Hawk Sharp-shinned Hawk Red-tailed Hawk Great Horned Owl American Kestrel Wild Turkey Mallard Great Blue Heron Belted Kingfisher Eastern Meadowlark Ruby-crowned Kinglet Golden-crowned Kinglet Hermit Thrush Red Crossbill Gray Catbird Western Tanager Hooded Oriole Phainopepla Black-throated Sparrow Lark Sparrow Green-tailed Towhee Pinyon Jay Western Screech-Owl Hooded Merganser Band-tailed Pigeon Yellow Warbler Common Yellowthroat Yellow-breasted Chat Orange-crowned Warbler Warbling Vireo Western Kingbird Vermilion Flycatcher Ash-throated Flycatcher Cliff Swallow Northern Rough-winged Swallow Bank Swallow Common Nighthawk Canada Goose American Coot Killdeer Spotted Sandpiper Green Heron Black-crowned Night Heron Turkey Vulture Black Vulture Osprey Bald Eagle Merlin Peregrine Falcon Northern Saw-whet Owl Barn Owl Burrowing Owl Lewis's Woodpecker Savannah Sparrow Vesper Sparrow Horned Lark Blue Grosbeak Varied Bunting Cactus Wren Greater Roadrunner Yellow-billed Cuckoo Yellow-headed Blackbird Brewer's Blackbird Great-tailed Grackle 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.