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

Common Yellowthroat Population Trend in New Hampshire

All statesForest birds

Common Yellowthroat in New Hampshire has edged down: down 20% on the route-weighted index since 1968.

-20%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 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 2029, near 14 (95% range 10–18). A 5-year backtest shows a typical error of ±6.3%, with 100% of held-out values landing inside the 95% band.

-8%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 →
14Projected 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 →
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 →
±6.3%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 2029, near 14 (95% range 10–18). A 5-year backtest shows a typical error of ±6.3%, with 100% 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 →
2025151119
2026151119
2027151119
2028141118
2029141018

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 →
Dixville Notch 23320242018
Canterbury3120241966
Dixvil Notch3120171966
Fitzwilliam2520241966
Walpole2520241966
Crawford Not2319751966
Marlow2120241966
Clarksville2020241966
Epsom1920231966
Lempster1920241966
Brentwood1819981966
Gilmantn I W1520241969
Mt Chocorua1420241966
Jefferson Hl1420241966
Franconia1420241966
Milan1420241966
Glen1420241975
Stratford1320241966
Dover1120241966
Concord1120241966
Strafford1120241966
Hopkinton1020241966
Wilmot1020241966
Peterborough820241966
East Kingston820241999

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 2026-05-22.