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

Gray Catbird Population Trend in New Hampshire

All statesForest birds

Gray Catbird in New Hampshire has held roughly steady: up 2% on the route-weighted index since 1968.

+2%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 Gray Catbird 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 →

No notable trend signals for Gray Catbird in New Hampshire. See the full index history below.

Gray Catbird Population Forecast in New Hampshire

If the recent trend holds, Gray Catbird in New Hampshire is projected to fall about 34% by 2030 — from 13 in 2025 to a central estimate of 8.6 (95% range 4.7–12). A 5-year backtest shows a typical error of ±32.7%, with 40% of held-out values landing inside the 95% band.

-34%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 →
8.6Projected 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 →
4.7–1295% 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 →
±32.7%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, Gray Catbird in New Hampshire is projected to fall about 34% by 2030 — from 13 in 2025 to a central estimate of 8.6 (95% range 4.7–12). A 5-year backtest shows a typical error of ±32.7%, with 40% 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 →
20268.84.913
20278.74.913
20288.74.813
20298.64.812
20308.64.712

Gray Catbird Survey Routes in New Hampshire

Routes recording Gray Catbird 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 →
Dover3920251966
Brentwood2719981966
Epsom2720251966
Concord2520251966
Marlow2220251966
Walpole2020251966
Strafford1820251966
Canterbury1820251966
East Kingston1820251999
Fitzwilliam1620251966
Lempster1620251966
Peterborough1320251966
Hopkinton1220251966
Gilmantn I W1120251969
Wilmot1020251966
Milan720251966
Glen720251975
Jefferson Hl520251966
Mt Chocorua420251966
Stratford420251966
Crawford Not319751966
Franconia320251966
Dixvil Notch320171966
Jeffers Ntch220251993
Clarksville120241966

Gray Catbird Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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