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

Red-eyed Vireo Population Trend in New Hampshire

All statesForest birds

Red-eyed Vireo in New Hampshire has risen sharply: up 74% on the route-weighted index since 1968.

+74%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 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 74% 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 2029, near 43 (95% range 30–55). A 5-year backtest shows a typical error of ±16.7%, with 80% 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 →
43Projected 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 →
30–5595% 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 →
±16.7%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 2029, near 43 (95% range 30–55). A 5-year backtest shows a typical error of ±16.7%, with 80% 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 →
2025423055
2026423055
2027433055
2028433055
2029433055

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 →
Strafford7620241966
Mt Chocorua7620241966
Glen7420241975
Canterbury6820241966
Fitzwilliam6320241966
Hopkinton5520241966
Walpole5520241966
Jeffers Ntch5420241993
Jefferson Hl5220241966
Crawford Not4719751966
Milan4520241966
Wilmot4220241966
Dixville Notch 24220242018
Gilmantn I W4020241969
Franconia3920241966
Clarksville3920241966
Concord3820241966
Peterborough3720241966
Lempster3720241966
Dixvil Notch3220171966
Epsom2920231966
Marlow2820241966
Stratford2720241966
Dover1920241966
East Kingston1420241999

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 2026-05-22.