Brown-headed Cowbird in December
Where cowbirds are in December, whether they are nesting, and the best foods to offer right now.
December in the Brown-headed Cowbird's year
December is the start of the true winter season. Birds are settled into winter ranges and flocking behavior peaks — mixed flocks move through woods and yards together, and feeding stations become social hubs. Short days mean birds must find most of their food in a few hours of daylight.
For the Brown-headed Cowbird specifically, December is a winter month of relative routine, with the species settled into its seasonal pattern across its range. Across the 58 states and provinces where cowbirds occur, what the bird is doing this month depends heavily on latitude — the details below break it down by band.
Where cowbirds are in December
- Southern states
- absent
- Mid-latitudes
- year-round resident
- Northern states & Canada
- absent
In December, cowbirds are absent in the South, year-round resident across the mid-latitudes, and absent in the northern states and Canada. That north–south split is the defining feature of this month: where you live changes which version of this bird you're looking at.
Nesting in December
Cowbirds are not nesting in December. The season runs April–July at mid-latitudes.
Outside the nesting season, cowbirds put their energy into feeding and flocking rather than territory and young — which is exactly what makes them easier to watch and attract this month.
What to feed in December
- Grain and feeder seed
A brood parasite — it lays eggs in other birds' nests. Feeding less millet and avoiding platform scatter reduces cowbird crowds.
Feeders are busiest at dawn and dusk as birds fuel up against long cold nights. Suet and other high-fat foods earn their keep this month.
Full Brown-headed Cowbird diet guide → · Best feeder for cowbirds →
Watching cowbirds this month
Cowbirds are settled and predictable in December, which makes this a good month to learn the bird's routine — same feeders, same perches, same times of day.
The state guides below show exactly where in your region cowbirds are expected this month and which native plants hold them in a yard.
Brown-headed Cowbird month by month
Brown-headed Cowbird by state
Frequently asked
Where are cowbirds in December?
In December, cowbirds are absent in the South, year-round resident across mid-latitudes and absent in the North.
Do cowbirds nest in December?
No — cowbirds typically nest April through July at mid-latitudes.
What do cowbirds eat in December?
Grain and feeder seed.
Sources
- Brown-headed Cowbird — All About Birds, Cornell Lab of Ornithology
- Brown-headed Cowbird life history — Cornell Lab of Ornithology
- Brown-headed Cowbird — Audubon Guide to North American Birds
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.