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Species · Connecticut · BBS 2025 Release · 1966–2024

Eastern Whip-poor-will Population Trend in Connecticut

All statesAerial insectivores

Eastern Whip-poor-will in Connecticut has fallen sharply: down 64% on the route-weighted index since 1973.

-64%Since 1973TrendPercent 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 →
10Routes 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 →
27YearsYears 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 ConnecticutNotable 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 Connecticut: down 64% on the route-weighted index since 1973.

Eastern Whip-poor-will Population Forecast in Connecticut

If the recent trend holds, Eastern Whip-poor-will in Connecticut is projected to fall about 17% by 2029 — from 0.11 in 2024 to a central estimate of 0.09 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±60.3%, with 80% of held-out values landing inside the 95% band.

-17%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 →
0.09Projected 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 →
0.00–0.2595% 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 →
±60.3%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 Connecticut is projected to fall about 17% by 2029 — from 0.11 in 2024 to a central estimate of 0.09 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±60.3%, with 80% of held-out values landing inside the 95% band.19712029
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 →
20250.100.000.26
20260.100.000.26
20270.100.000.25
20280.090.000.25
20290.090.000.25

Eastern Whip-poor-will Survey Routes in Connecticut

Routes recording Eastern Whip-poor-will in Connecticut.
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 →
New Hartford220062000
New Hartford219871972
Buckingham119881988
Uncasville120191973
Woodstock119751973
Willimantic119781978
No Woodbury119771977
Danbury119711971
Long Hill119821982
Granby120241988

Eastern Whip-poor-will Population Trend in Other States

alabamaarkansasdelawaregeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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