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

Blackburnian Warbler Population Trend in Pennsylvania

All statesForest birds

Blackburnian Warbler in Pennsylvania has surged: up 774% on the route-weighted index since 1968.

+774%Since 1968
76Routes In State
58Years

Notable Blackburnian Warbler Trends in Pennsylvania

long arc increasecomputed index

Blackburnian Warbler has surged in Pennsylvania: up 774% on the route-weighted index since 1968.

Blackburnian Warbler Population Forecast in Pennsylvania

If the recent trend holds, Blackburnian Warbler in Pennsylvania is projected to rise about 22% by 2029 — from 1.7 in 2024 to a central estimate of 2.1 (95% range 1.5–2.6). A 5-year backtest shows a typical error of ±18.2%, with 100% of held-out values landing inside the 95% band.

+22%Change by 2029
2.1Projected 2029 index
1.5–2.695% range
±18.2%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
20251.91.42.5
20262.01.42.5
20272.01.42.6
20282.01.52.6
20292.11.52.6

Blackburnian Warbler Survey Routes in Pennsylvania

Routes recording Blackburnian Warbler in Pennsylvania.
Eldred2120221981
Ansonia1520242002
Roulette 21520242022
Ridgway1220181966
Whig Hill1020241966
Odin1020241976
Rasselas920221969
Duboistown920241996
Logue820231976
Broad Mtn.820241993
Marsh Hill720241983
N Pine Grove620241969
Russell City620241968
Poyntelle620241973
Ltl Pine Cr620241990
Ellenton520241982
Roulette520211977
Arnot520241993
Landisburg520241978
Sigel420241995
Betula420221987
Naginey420241974
Pottersdale320221969
English Ctr319891987
Laurel Hill320241978

Blackburnian Warbler Population Trend in Other States

connecticutgeorgiaindianamainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinaohiorhode-islandtennesseevermontvirginiawest-virginiawisconsin

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