Eastern Bluebirds in Delaware
When bluebirds are present in Delaware, when they nest, which native Delaware plants feed them, and how to host them in a USDA 7a–8a yard.
- Status in Delaware
- Year-round resident
- Nesting window
- April–August
- Broods
- 1–3 per season
- Hardiness zones
- USDA 7a–8a
- Nest box
- 1 1/2 in round (1 9/16 in for Mountain/Western overlap) hole, 5 × 5 in floor, 4–6 ft on a baffled pole
When to expect bluebirds in Delaware
Eastern Bluebirds live in Delaware all year. Mild winters with modest snow; coastal marshes draw huge numbers of wintering sparrows and blackbirds. That makes the cold months the time your yard matters most to them: their winter diet shifts toward dogwood, sumac, holly, juniper and hackberry fruit; mealworms offered at feeders.
Humid subtropical to temperate coastal plain between Delaware Bay and the Atlantic.
Nesting in Delaware
Across Delaware, bluebirds typically nest from April–August. Nest site: secondary cavity nester — old woodpecker holes and nest boxes in open habitat. Females lay 2–7 eggs, incubate for 11–19 days, and young leave the nest after 15–20 days.
Hot, humid summers; bay-shore woodlots are important migrant stopovers in May.
- Have boxes cleaned and mounted before March — bluebirds begin prospecting ahead of egg-laying.
- Use a 1 1/2 in round (1 9/16 in for Mountain/Western overlap) entrance on a 5 × 5 in floor, mounted 4–6 ft on a baffled pole.
- Fit a pole baffle or hole guard; ventilation gaps and drainage holes are essential.
- Clean out old nests after each brood and again after August.
Native Delaware plants that attract bluebirds
Of the regional native plants we track for Delaware, these 8 provide food or cover bluebirds use:
Fat-rich red fall fruit taken by thrushes, bluebirds and woodpeckers.
Dense evergreen roost cover and bluish 'berries' eaten through winter.
Early-summer berries arrive exactly when nestlings are being fed.
Deciduous holly holding red fruit into mid-winter.
Fruit clusters persist all winter as emergency food.
Red fruit heads hang on through winter.
Acorns plus hundreds of caterpillar species for nestling food.
Summer fruit and one of the top caterpillar host trees.
Feeding bluebirds through the Delaware year
Bluebirds hunt from perches over short grass. Put mealworm feeders in the open, near a low perch, and offer small amounts at the same time each day.
- Best foods: Live or dried mealworms, Suet nuggets / insect-suet dough, Chopped native fruit.
- Avoid: Loose seed mixes — bluebirds rarely eat seed.
- In Delaware's winter: Mild winters with modest snow; coastal marshes draw huge numbers of wintering sparrows and blackbirds.
Full diet breakdown for bluebirds · Best feeder for bluebirds
Frequently asked
Are bluebirds in Delaware year-round?
Yes. Eastern Bluebirds are year-round residents in Delaware.
When do bluebirds nest in Delaware?
Nesting in Delaware typically runs April–August, with 1–3 per season. Clutches are 2–7 eggs, incubated for 11–19 days.
What native plants attract bluebirds in Delaware?
Flowering dogwood, Eastern red cedar, Serviceberry, Winterberry, Staghorn sumac, Smooth sumac, White oak, Black cherry are native plants in Delaware that provide food or cover for bluebirds.
What size birdhouse hole do bluebirds need?
1 1/2 in round (1 9/16 in for Mountain/Western overlap), with a floor of 5 × 5 in mounted 4–6 ft on a baffled pole.
Eastern Bluebirds in other regions
Other backyard birds in Delaware
Sources
- Eastern Bluebird — All About Birds, Cornell Lab of Ornithology
- Eastern Bluebird life history — Cornell Lab of Ornithology
- Eastern Bluebird — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
- eBird region overview and bar charts — Delaware
- 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.