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Species · Wisconsin · BBS 2025 Release · 1966–2024

Eastern Whip-poor-will Population Trend in Wisconsin

All statesAerial insectivores

Eastern Whip-poor-will in Wisconsin has fallen sharply: down 56% on the route-weighted index since 1968.

-56%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 →
48Routes 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 WisconsinNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Eastern Whip-poor-will has fallen sharply in Wisconsin: down 56% on the route-weighted index since 1968.

Eastern Whip-poor-will Population Forecast in Wisconsin

If the recent trend holds, Eastern Whip-poor-will in Wisconsin is projected to fall about 62% by 2029 — from 0.07 in 2024 to a central estimate of 0.03 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±45.8%, with 100% 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 →
0.03Projected 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 →
0.00–0.1495% 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 →
±45.8%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 Wisconsin is projected to fall about 62% by 2029 — from 0.07 in 2024 to a central estimate of 0.03 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±45.8%, with 100% 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 →
20250.040.000.15
20260.040.000.15
20270.030.000.15
20280.030.000.15
20290.030.000.14

Eastern Whip-poor-will Survey Routes in Wisconsin

Routes recording Eastern Whip-poor-will in Wisconsin.
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 →
Conover320241998
Princeton319911968
Grand View220111966
Union Twp220211967
Popple River220211967
Crandon219931968
Mather219941969
Clintonville220082008
Buena Vista220241998
Shanagolden119961975
Land O Lakes120041995
Hudson119871978
Dresser119931989
Loraine119691969
Cumberland119691969
Pigeon Creek120151999
Gilman120122012
Rib Lake119871977
Irma119951972
Mcnaughton119881988
Hollister119931967
Amberg119991981
Wausaukee120241980
Washington I119821982
Cochrane119911966

Eastern Whip-poor-will Population Trend in Other States

alabamaarkansasconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginia

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