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Species · Pennsylvania · BBS 2025 Release · 1966–2024

Eastern Whip-poor-will Population Trend in Pennsylvania

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Eastern Whip-poor-will in Pennsylvania has declined: down 40% on the route-weighted index since 1968.

-40%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
52Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eastern Whip-poor-will Trends in PennsylvaniaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Eastern Whip-poor-will in Pennsylvania. See the full index history below.

Eastern Whip-poor-will Population Forecast in Pennsylvania

If the recent trend holds, Eastern Whip-poor-will in Pennsylvania is projected to fall about 62% by 2029 — from 0.16 in 2024 to a central estimate of 0.06 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±78%, with 80% of held-out values landing inside the 95% band.

-62%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.06Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±78%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Eastern Whip-poor-will in Pennsylvania is projected to fall about 62% by 2029 — from 0.16 in 2024 to a central estimate of 0.06 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±78%, with 80% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.070.000.22
20260.060.000.22
20270.060.000.22
20280.060.000.21
20290.060.000.21

Eastern Whip-poor-will Survey Routes in Pennsylvania

Routes recording Eastern Whip-poor-will in Pennsylvania.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Tussey Mtn.620241993
Roulette319891989
Mill Run319811979
Wild Creek219991988
Rothrock Sf220101992
Pottersdale220182017
Rasselas220222022
Ramsey220151968
English Ctr219771967
Poyntelle220172017
Stoneybreak220232015
South Mtn220171989
Pine Gr Mill220241967
Needmore219881966
Whig Hill119871972
Broad Mtn.120241994
N Washington119701970
Lovelton120242000
Sproul Sf-A120242002
Sproul Sf-B120162016
Mars120232023
Arnot119741969
Rosecrans120231969
Ravensburg119751975
Mawr Glen119761967

Eastern Whip-poor-will Population Trend in Other States

alabamaarkansasconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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