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

Common Yellowthroat Population Trend in New Hampshire

All statesForest birds

Common Yellowthroat in New Hampshire has edged down: down 22% on the route-weighted index since 1968.

-22%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 Common Yellowthroat 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 Common Yellowthroat in New Hampshire. See the full index history below.

Common Yellowthroat Population Forecast in New Hampshire

If the recent trend holds, Common Yellowthroat in New Hampshire is projected to stay roughly flat through 2030, near 14 (95% range 10–18). A 5-year backtest shows a typical error of ±5.4%, with 100% of held-out values landing inside the 95% band.

+0%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 →
14Projected 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 →
10–1895% 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 →
±5.4%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, Common Yellowthroat in New Hampshire is projected to stay roughly flat through 2030, near 14 (95% range 10–18). A 5-year backtest shows a typical error of ±5.4%, 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 →
2026151119
2027151118
2028141118
2029141018
2030141018

Common Yellowthroat Survey Routes in New Hampshire

Routes recording Common Yellowthroat 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 →
Stratford3220251966
Dixvil Notch3120171966
Dixville Notch 23120252018
Canterbury2920251966
Crawford Not2319751966
Dover2120251966
Marlow2120251966
Brentwood1819981966
Fitzwilliam1620251966
Wilmot1620251966
Lempster1520251966
Gilmantn I W1320251969
Milan1320251966
Mt Chocorua1220251966
Walpole1220251966
Jefferson Hl1220251966
Clarksville1120251966
Glen1020251975
East Kingston1020251999
Jeffers Ntch1020251993
Hopkinton920251966
Concord820251966
Peterborough720251966
Franconia720251966
Epsom620251966

Common Yellowthroat 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.