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

American Robin Population Trend in New Hampshire

All statesForest birds

American Robin in New Hampshire has declined: down 45% on the route-weighted index since 1968.

-45%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 American Robin 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 American Robin in New Hampshire. See the full index history below.

American Robin Population Forecast in New Hampshire

If the recent trend holds, American Robin in New Hampshire is projected to stay roughly flat through 2030, near 25 (95% range 15–35). A 5-year backtest shows a typical error of ±6.2%, with 100% of held-out values landing inside the 95% band.

-9%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 →
25Projected 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 →
15–3595% 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 →
±6.2%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, American Robin in New Hampshire is projected to stay roughly flat through 2030, near 25 (95% range 15–35). A 5-year backtest shows a typical error of ±6.2%, 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 →
2026271736
2027261636
2028261636
2029251635
2030251535

American Robin Survey Routes in New Hampshire

Routes recording American Robin 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 →
Dover5320251966
East Kingston5020251999
Crawford Not4819751966
Glen3920251975
Dixvil Notch3520171966
Strafford3320251966
Canterbury2920251966
Concord2820251966
Stratford2820251966
Jeffers Ntch2820251993
Fitzwilliam2720251966
Marlow2720251966
Peterborough2520251966
Epsom2520251966
Franconia2520251966
Clarksville2520251966
Brentwood2419981966
Hopkinton2420251966
Mt Chocorua2420251966
Walpole2420251966
Milan2420251966
Wilmot2120251966
Dixville Notch 22120252018
Jefferson Hl1920251966
Lempster1720251966

American Robin Population Trend in Other States

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

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