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Species · Pennsylvania · BBS 2025 Release · 1966–2024

Eastern Bluebird Population Trend in Pennsylvania

All statesForest birds

Eastern Bluebird in Pennsylvania has surged: up 263% on the route-weighted index since 1968.

+263%Since 1968
135Routes In State
58Years

Notable Eastern Bluebird Trends in Pennsylvania

long arc increasecomputed index

Eastern Bluebird has surged in Pennsylvania: up 263% on the route-weighted index since 1968.

Eastern Bluebird Population Forecast in Pennsylvania

If the recent trend holds, Eastern Bluebird in Pennsylvania is projected to rise about 11% by 2029 — from 4.6 in 2024 to a central estimate of 5.1 (95% range 3.8–6.4). A 5-year backtest shows a typical error of ±21.2%, with 80% of held-out values landing inside the 95% band.

+11%Change by 2029
5.1Projected 2029 index
3.8–6.495% range
±21.2%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20254.93.66.2
20264.93.66.2
20275.03.76.3
20285.13.86.4
20295.13.86.4

Eastern Bluebird Survey Routes in Pennsylvania

Routes recording Eastern Bluebird in Pennsylvania.
Ryde2320051970
Middletown1520241984
Williamsburg1420241988
Naginey1420241970
Jefferson1420241966
Brick Tavern1420241990
Espyville1320241989
Clover1220241981
Needmore1219911966
Wyalusing1220241985
Harmonsburg1120231966
Doe Run1120241975
Berwick1120241985
Jeannette1020231981
Mount Joy1020241990
Hop Bottom920241968
Greentown920241969
Drehersville 2920242000
Doylesburg820232009
Stoneybreak820241992
Jacobus820241987
Waller720241977
Millville720241970
Bald Eagle720241978
Clear Spring720241985

Eastern Bluebird Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.