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

Cliff Swallow Population Trend in Pennsylvania

All statesAerial insectivores

Cliff Swallow in Pennsylvania has declined: down 36% on the route-weighted index since 1968.

-36%Since 1968
85Routes In State
58Years

Notable Cliff Swallow Trends in Pennsylvania

No notable trend signals for Cliff Swallow in Pennsylvania. See the full index history below.

Cliff Swallow Population Forecast in Pennsylvania

If the recent trend holds, Cliff Swallow in Pennsylvania is projected to rise about 25% by 2029 — from 0.56 in 2024 to a central estimate of 0.70 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±27.8%, with 100% of held-out values landing inside the 95% band.

+25%Change by 2029
0.70Projected 2029 index
0.00–1.695% range
±27.8%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
20250.750.001.7
20260.740.001.6
20270.730.001.6
20280.720.001.6
20290.700.001.6

Cliff Swallow Survey Routes in Pennsylvania

Routes recording Cliff Swallow in Pennsylvania.
Garrett2120241975
Harrisville1820112011
Eldred1120221981
Carsonville1019961989
Russell City820231970
Munson820241987
Ltl Pine Cr820211996
Roulette620161977
West Grove619921976
Ridgway519671967
Rosecrans520221969
Susquehanna520241971
New Ringgold520151966
Clearfield519931971
Mill Run520241987
Rasselas420162006
Marsh Hill420221984
Ryde419971978
Wild Creek420231988
Espyville320241967
Lynch320171971
Pottersdale319971971
Betula320221973
Ramsey320191968
Little Marsh320152001

Cliff Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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