When do Bullock's orioles arrive in California?
The Bullock's Oriole is a summer breeder in California — here is when to expect it, when it leaves, and how to be ready.
Bullock's Oriole timing in California
- Arrives
- Around March
- Leaves
- By August
- Status here
- Summer breeder
- Nesting season
- April–July
- Present roughly
- March–August
In California, Bullock's orioles are present through the warm months, arriving around March and heading south again by August.
These windows are set by latitude: California sits in the southern part of this species' range, so timing here runs earlier than the continental average — spring comes sooner, and the birds follow it. In any given year, weather can move the first arrivals by a week or two either way.
Month by month in this state
Highlighted months are when Bullock's orioles are expected in California. The edges of the window are the interesting weeks — first arrivals and last departures vary most from year to year.
Getting ready before they arrive
The week before March is the time to act. Have feeders cleaned, filled and out by early March — the first Bullock's orioles into California are scouting for reliable food, and a station that's ready early gets added to their route.
Once nesting begins around April, adults switch to protein-rich food for their young and visits to feeders become quick and purposeful. Expect the busiest activity at dawn.
What Bullock's orioles eat while they're here
- Caterpillars
Weaves hanging nests in cottonwoods along western rivers.
Full Bullock's Oriole diet guide → · Best feeder for Bullock's orioles →
Native plants that hold Bullock's orioles in California
Food keeps a migrant for a day; habitat keeps it for the season. These California-native plants are known to attract Bullock's orioles:
Red fruit heads hang on through winter.
Scarlet late-summer spikes; a hummingbird magnet in moist soil.
Tubular flowers for hummingbirds and seed heads for finches.
Dark summer fruit and heavy caterpillar load.
White fruit and red winter stems; good thicket cover.
Early yellow flowers for hummingbirds, then summer fruit.
Saskatoon berries ripen in early summer.
Red trumpets for Broad-tailed and Rufous hummingbirds.
Keep exploring
Frequently asked
When do Bullock's orioles arrive in California?
Bullock's orioles typically arrive in California around March, with nesting underway by April. Timing can shift a week or two with the weather in any given year.
When do Bullock's orioles leave California?
Most Bullock's orioles have left California by August. They spend the winter farther south and return the following spring.
Do Bullock's orioles stay in California all year?
No — in California the Bullock's Oriole is a summer breeder, present roughly March–August. Outside that window it is rarely seen in the state.
What should I put out before Bullock's orioles arrive in California?
Have feeders up and clean by early March — first arrivals scout reliable food sources. Good offerings for this species: caterpillars.
Sources
- Bullock's Oriole — All About Birds, Cornell Lab of Ornithology
- Bullock's Oriole life history — Cornell Lab of Ornithology
- Bullock's Oriole — Audubon Guide to North American Birds
- eBird region overview and bar charts — California
- USDA Plant Hardiness Zone Map (2023)
- Audubon Native Plants Database
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.