Eastern Bluebirds in Pennsylvania

Eastern Bluebirds live in Pennsylvania all year — fewer birds remain in winter. Snow cover makes suet and heated water valuable; both chickadee species meet in a narrow hybrid zone across the south of the state. 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 continental; cold, snowy winters in the north and mountains, milder in the southeast.

Across Pennsylvania, 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.

Warm summers; bluebirds typically raise two broods.

• 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.

Of the regional native plants we track for Pennsylvania, these 8 provide food or cover bluebirds use:

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 Pennsylvania's winter: Snow cover makes suet and heated water valuable; both chickadee species meet in a narrow hybrid zone across the south of the state.

Full diet breakdown for bluebirds · Best feeder for bluebirds