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Species · Pennsylvania · BBS 2025 Release · 1966–2024

Carolina Wren Population Trend in Pennsylvania

All statesForest birds

Carolina Wren in Pennsylvania has surged: up 32× on the route-weighted index since 1968.

32×Since 1968
131Routes In State
58Years

Notable Carolina Wren Trends in Pennsylvania

long arc increasecomputed index

Carolina Wren has surged in Pennsylvania: up 32× on the route-weighted index since 1968.

Carolina Wren Population Forecast in Pennsylvania

If the recent trend holds, Carolina Wren in Pennsylvania is projected to fall about 34% by 2029 — from 9.1 in 2024 to a central estimate of 6.0 (95% range 3.9–8.1). A 5-year backtest shows a typical error of ±28.3%, with 60% of held-out values landing inside the 95% band.

-34%Change by 2029
6.0Projected 2029 index
3.9–8.195% range
±28.3%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
20255.63.57.7
20265.73.67.8
20275.83.77.9
20285.93.88.0
20296.03.98.1

Carolina Wren Survey Routes in Pennsylvania

Routes recording Carolina Wren in Pennsylvania.
Stoneybreak3520241992
Peru Mills2720241966
Doylesburg2720232009
Clear Spring2520241970
Mifflintown2520241966
Millville2420241973
Waterstreet2420241969
Collegeville2320241973
Jacobus2220241986
Pine Gr Mill2120241968
Middletown2120241973
Chatham2120241997
Doe Run2020241969
Beaver1920241971
Needmore1919911967
Plesant Grov1720241969
Parkwood1720241967
Ryde1720051969
Landisburg1720241978
Schwenksvill1720241988
Drehersville 21720242000
Berwick1720241986
Geeseytown1620241987
Mount Joy1620241978
Shelocta1520241971

Carolina Wren Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsin

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