Western Bluebirds in California
When western bluebirds are present in California, when they nest, which native California plants feed them, and how to host them in a USDA 5a–11a yard.
- Status in California
- Year-round resident
- Nesting window
- March–July
- Broods
- 1–2 per season
- Hardiness zones
- USDA 5a–11a
- Nest box
- 1 1/2 in hole, 5 × 5 in floor, 5–10 ft
When to expect western bluebirds in California
Western Bluebirds live in California all year. Wet, mild winters are the green season — the busiest time at coastal feeders as sparrows and hummingbirds settle in. That makes the cold months the time your yard matters most to them: their winter diet shifts toward mistletoe, juniper and elderberry.
Mediterranean along the coast and Central Valley, alpine in the Sierra Nevada, and desert in the southeast.
Nesting in California
Across California, western bluebirds typically nest from March–July. Nest site: cavity or nest box. Females lay 2–8 eggs, incubate for 12–17 days, and young leave the nest after 19–25 days.
Dry summers with little rain from May to October; water and summer-blooming natives matter more than extra seed.
- Have boxes cleaned and mounted before February — western bluebirds begin prospecting ahead of egg-laying.
- Use a 1 1/2 in entrance on a 5 × 5 in floor, mounted 5–10 ft.
- Fit a pole baffle or hole guard; ventilation gaps and drainage holes are essential.
- Clean out old nests after each brood and again after July.
Native California plants that attract western bluebirds
Of the regional native plants we track for California, these 8 provide food or cover western bluebirds use:
Red fruit heads hang on through winter.
Insect-rich in fall and seed in winter.
Dark summer fruit and heavy caterpillar load.
White fruit and red winter stems; good thicket cover.
Seeds and bark insects; pygmy nuthatch and woodpecker habitat.
Early yellow flowers for hummingbirds, then summer fruit.
Saskatoon berries ripen in early summer.
Tart red fruit that persists into winter.
Feeding western bluebirds through the California year
Uses 1 1/2 in nest boxes in open oak and pine woodland; boxes have helped recovery in the Pacific Northwest.
- Best foods: Mealworms, Suet nuggets.
- In California's winter: Wet, mild winters are the green season — the busiest time at coastal feeders as sparrows and hummingbirds settle in.
Full diet breakdown for western bluebirds · Best feeder for western bluebirds
Frequently asked
Are western bluebirds in California year-round?
Yes. Western Bluebirds are year-round residents in California.
When do western bluebirds nest in California?
Nesting in California typically runs March–July, with 1–2 per season. Clutches are 2–8 eggs, incubated for 12–17 days.
What native plants attract western bluebirds in California?
Smooth sumac, Tall goldenrod, Chokecherry, Red-osier dogwood, Ponderosa pine, Golden currant, Western serviceberry, Buffaloberry are native plants in California that provide food or cover for western bluebirds.
What size birdhouse hole do western bluebirds need?
1 1/2 in, with a floor of 5 × 5 in mounted 5–10 ft.
Western Bluebirds in other regions
Other backyard birds in California
Sources
- Western Bluebird — All About Birds, Cornell Lab of Ornithology
- Western Bluebird life history — Cornell Lab of Ornithology
- Western Bluebird — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
- 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.