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

Red-eyed Vireo Population Trend in New Hampshire

All statesForest birds

Red-eyed Vireo in New Hampshire has risen sharply: up 71% on the route-weighted index since 1968.

+71%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 Red-eyed Vireo 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Red-eyed Vireo has risen sharply in New Hampshire: up 71% on the route-weighted index since 1968.

Red-eyed Vireo Population Forecast in New Hampshire

If the recent trend holds, Red-eyed Vireo in New Hampshire is projected to stay roughly flat through 2030, near 43 (95% range 31–56). A 5-year backtest shows a typical error of ±18.2%, with 80% 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 →
43Projected 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 →
31–5695% 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 →
±18.2%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, Red-eyed Vireo in New Hampshire is projected to stay roughly flat through 2030, near 43 (95% range 31–56). A 5-year backtest shows a typical error of ±18.2%, with 80% 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 →
2026433055
2027433055
2028433055
2029433156
2030433156

Red-eyed Vireo Survey Routes in New Hampshire

Routes recording Red-eyed Vireo 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 →
Glen9220251975
Jeffers Ntch8420251993
Wilmot7520251966
Canterbury7320251966
Mt Chocorua6320251966
Jefferson Hl5920251966
Fitzwilliam5620251966
Hopkinton5420251966
Walpole5320251966
Strafford4720251966
Crawford Not4719751966
Franconia4720251966
Clarksville4720251966
Dixville Notch 24420252018
Gilmantn I W4320251969
Stratford4220251966
Marlow3620251966
Milan3620251966
Lempster3220251966
Dixvil Notch3220171966
Concord2920251966
Dover2820251966
Peterborough2520251966
Epsom1720251966
East Kingston920251999

Red-eyed Vireo Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsinwyoming

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