BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Eastern Whip-poor-will Population Trend in New Hampshire

All statesAerial insectivores

Eastern Whip-poor-will in New Hampshire has fallen sharply: down 53% on the route-weighted index since 1968.

-53%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 →
15Routes 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 →
38YearsYears 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 New HampshireNotable 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 New Hampshire: down 53% on the route-weighted index since 1968.

Eastern Whip-poor-will Population Forecast in New Hampshire

If the recent trend holds, Eastern Whip-poor-will in New Hampshire is projected to fall about 81% by 2027 — from 0.17 in 2022 to a central estimate of 0.03 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±117.8%, with 80% of held-out values landing inside the 95% band.

-81%Change by 2027TrendPercent 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 2027 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 →
±117.8%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 New Hampshire is projected to fall about 81% by 2027 — from 0.17 in 2022 to a central estimate of 0.03 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±117.8%, with 80% of held-out values landing inside the 95% band.19662027
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 →
20230.040.000.26
20240.040.000.26
20250.040.000.26
20260.040.000.25
20270.030.000.25

Eastern Whip-poor-will Survey Routes in New Hampshire

Routes recording Eastern Whip-poor-will in New Hampshire.
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 →
Epsom220221969
Wilmot220221968
Brentwood119801975
Fitzwilliam119741966
Dover119801966
Hopkinton119721968
Concord119861985
Strafford119691966
Canterbury120071968
Gilmantn I W119931993
East Kingston120042004
Walpole119741967
Marlow120021969
Milan120071977
Stratford119951967

Eastern Whip-poor-will Population Trend in Other States

alabamaarkansasconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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