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

Gray Catbird Population Trend in New Hampshire

All statesGeneralists

Gray Catbird in New Hampshire has held roughly steady: down 3% on the route-weighted index since 1968.

-3%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 →
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 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 20% by 2029 — from 10 in 2024 to a central estimate of 8.3 (95% range 4.6–12). A 5-year backtest shows a typical error of ±30.4%, with 40% of held-out values landing inside the 95% band.

-20%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 →
8.3Projected 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 →
4.6–1295% 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 →
±30.4%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 20% by 2029 — from 10 in 2024 to a central estimate of 8.3 (95% range 4.6–12). A 5-year backtest shows a typical error of ±30.4%, with 40% 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 →
20258.54.812
20268.54.712
20278.44.712
20288.34.612
20298.34.612

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 →
Dover2920241966
Brentwood2719981966
East Kingston2420241999
Hopkinton1820241966
Peterborough1720241966
Walpole1720241966
Marlow1620241966
Concord1420241966
Strafford1420241966
Fitzwilliam1220241966
Gilmantn I W1120241969
Epsom920231966
Canterbury920241966
Lempster920241966
Wilmot720241966
Mt Chocorua620241966
Glen620241975
Milan520241966
Jefferson Hl420241966
Crawford Not319751966
Dixvil Notch320171966
Jeffers Ntch320241993
Franconia220241966
Stratford220241966
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 2026-05-22.