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

Ruby-throated Hummingbird Population Trend in New Hampshire

All statesForest birds

Ruby-throated Hummingbird in New Hampshire has surged: up 92% on the route-weighted index since 1968.

+92%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 Ruby-throated Hummingbird 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 →

Ruby-throated Hummingbird has surged in New Hampshire: up 92% on the route-weighted index since 1968.

Ruby-throated Hummingbird Population Forecast in New Hampshire

If the recent trend holds, Ruby-throated Hummingbird in New Hampshire is projected to stay roughly flat through 2030, near 0.65 (95% range 0.29–1.0). A 5-year backtest shows a typical error of ±24.1%, with 80% of held-out values landing inside the 95% band.

-7%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 →
0.65Projected 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 →
0.29–1.095% 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 →
±24.1%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, Ruby-throated Hummingbird in New Hampshire is projected to stay roughly flat through 2030, near 0.65 (95% range 0.29–1.0). A 5-year backtest shows a typical error of ±24.1%, 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 →
20260.620.260.98
20270.630.270.99
20280.630.280.99
20290.640.281.00
20300.650.291.0

Ruby-throated Hummingbird Survey Routes in New Hampshire

Routes recording Ruby-throated Hummingbird 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 →
Strafford220251967
Wilmot220251966
Walpole220251966
Marlow220241979
Jefferson Hl220251967
Glen220251978
Peterborough120241966
Brentwood119971969
Fitzwilliam120231967
Dover120251966
Hopkinton120221972
Epsom120241968
Concord120251978
Canterbury120241967
Gilmantn I W120191983
Mt Chocorua120251972
Lempster120251966
Crawford Not119701967
Franconia120251966
Milan120221972
Stratford120191966
Dixvil Notch120161971
Clarksville120171969
East Kingston120092009
Jeffers Ntch120221994

Ruby-throated Hummingbird Population Trend in Other States

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

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