BirdAnalyst
Species · New Hampshire · BBS 2026 Release · 1966–2025

Wood Thrush Population Trend in New Hampshire

All statesForest birds

Wood Thrush in New Hampshire has collapsed: down 86% on the route-weighted index since 1968.

-86%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 →
26Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Wood Thrush 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 →

Wood Thrush has collapsed in New Hampshire: down 86% on the route-weighted index since 1968.

Wood Thrush Population Forecast in New Hampshire

If the recent trend holds, Wood Thrush in New Hampshire is projected to fall about 100% by 2030 — from 2.9 in 2025 to a central estimate of 0.00 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±196.1%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2030TrendPercent 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 →
0.00Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–6.695% 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 →
±196.1%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, Wood Thrush in New Hampshire is projected to fall about 100% by 2030 — from 2.9 in 2025 to a central estimate of 0.00 (95% range 0.00–6.6). A 5-year backtest shows a typical error of ±196.1%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.000.006.6
20270.000.006.6
20280.000.006.6
20290.000.006.6
20300.000.006.6

Wood Thrush Survey Routes in New Hampshire

Routes recording Wood Thrush 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 →
Crawford Not2019751966
Brentwood1619981966
Hopkinton1220251966
Dover1020251966
East Kingston1020251999
Strafford620251966
Canterbury620251966
Epsom520251966
Gilmantn I W520241969
Wilmot520251966
Peterborough320241966
Fitzwilliam320251966
Walpole320251966
Milan320241966
Franconia220251966
Clarksville220071967
Dixville Notch 2220242019
Concord120251966
Mt Chocorua120221966
Marlow120251966
Lempster120251966
Jefferson Hl120251966
Stratford120211966
Dixvil Notch120151966
Glen120251975

Wood Thrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.