BirdAnalyst
Species · Pennsylvania · BBS 2025 Release · 1966–2024

Black-and-white Warbler Population Trend in Pennsylvania

All statesForest birds

Black-and-white Warbler in Pennsylvania has surged: up 246% on the route-weighted index since 1968.

+246%Since 1968
112Routes In State
58Years

Notable Black-and-white Warbler Trends in Pennsylvania

long arc increasecomputed index

Black-and-white Warbler has surged in Pennsylvania: up 246% on the route-weighted index since 1968.

Black-and-white Warbler Population Forecast in Pennsylvania

If the recent trend holds, Black-and-white Warbler in Pennsylvania is projected to fall about 34% by 2029 — from 3.0 in 2024 to a central estimate of 2.0 (95% range 1.3–2.6). A 5-year backtest shows a typical error of ±25.2%, with 40% of held-out values landing inside the 95% band.

-34%Change by 2029
2.0Projected 2029 index
1.3–2.695% range
±25.2%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
20251.91.32.6
20261.91.32.6
20272.01.32.6
20282.01.32.6
20292.01.32.6

Black-and-white Warbler Survey Routes in Pennsylvania

Routes recording Black-and-white Warbler in Pennsylvania.
Duboistown2220241987
Poyntelle2020241973
Roulette 21620242022
Broad Mtn.1620241994
Roulette1520211976
Tussey Mtn.1520241993
Ansonia1520242002
Mill Run1420241978
Odin1120241974
Munson1120241979
Ltl Pine Cr1120241990
Starlight 2920242000
Laurel Hill920241978
Pottersdale820241968
Ryde820051968
Sproul Sf-A820242002
Marsh Hill720241983
Geeseytown720241987
St College720241969
English Ctr619891988
Cherry Sprs620231974
Rothrock Sf620191992
Susquehanna520241971
Ellenton520241982
Greentown420241973

Black-and-white Warbler Population Trend in Other States

alabamaarkansascaliforniaconnecticutdelawaregeorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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