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

Ruby-throated Hummingbird Population Trend in New Hampshire

All statesGeneralists

Ruby-throated Hummingbird in New Hampshire has surged: up 119% on the route-weighted index since 1968.

+119%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 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 119% 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 2029, near 0.63 (95% range 0.27–0.99). A 5-year backtest shows a typical error of ±29%, with 80% of held-out values landing inside the 95% band.

-7%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 →
0.63Projected 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 →
0.27–0.9995% 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 →
±29%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 2029, near 0.63 (95% range 0.27–0.99). A 5-year backtest shows a typical error of ±29%, 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 →
20250.610.250.97
20260.610.250.98
20270.620.260.98
20280.630.270.99
20290.630.270.99

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 →
Wilmot320241966
Mt Chocorua220241972
Walpole220241966
Marlow220241979
Peterborough120241966
Brentwood119971969
Fitzwilliam120231967
Dover120241966
Hopkinton120221972
Epsom120231968
Concord120241978
Strafford120241967
Canterbury120241967
Gilmantn I W120191983
Lempster120231966
Crawford Not119701967
Jefferson Hl120191967
Franconia120221966
Milan120221972
Stratford120191966
Dixvil Notch120161971
Clarksville120171969
Glen120241978
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 2026-05-22.