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

Yellow-throated Vireo Population Trend in New Hampshire

All statesForest birds

Yellow-throated Vireo in New Hampshire has surged: up 99% on the route-weighted index since 1968.

+99%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 →
20Routes 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 Yellow-throated 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 →

Yellow-throated Vireo has surged in New Hampshire: up 99% on the route-weighted index since 1968.

Yellow-throated Vireo Population Forecast in New Hampshire

If the recent trend holds, Yellow-throated Vireo in New Hampshire is projected to stay roughly flat through 2029, near 0.31 (95% range 0.06–0.56). A 5-year backtest shows a typical error of ±97.7%, with 100% of held-out values landing inside the 95% band.

-3%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 →
0.31Projected 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 →
0.06–0.5695% 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 →
±97.7%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, Yellow-throated Vireo in New Hampshire is projected to stay roughly flat through 2029, near 0.31 (95% range 0.06–0.56). A 5-year backtest shows a typical error of ±97.7%, 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 →
20250.300.050.55
20260.300.050.55
20270.300.050.56
20280.300.050.56
20290.310.060.56

Yellow-throated Vireo Survey Routes in New Hampshire

Routes recording Yellow-throated 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 →
East Kingston420242000
Glen320051975
Brentwood219971968
Fitzwilliam219841979
Dover220231987
Hopkinton220171972
Epsom220071973
Peterborough119951969
Concord120011979
Strafford120241967
Canterbury120241969
Wilmot120031977
Mt Chocorua119791971
Walpole120171970
Marlow120241966
Jefferson Hl119871987
Franconia119791968
Milan119781978
Stratford119731966
Jeffers Ntch120102010

Yellow-throated Vireo Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.