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

Eastern Bluebird Population Trend in New Hampshire

All statesForest birds

Eastern Bluebird in New Hampshire has surged: up 437% on the route-weighted index since 1968.

+437%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 Eastern Bluebird 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 →

Eastern Bluebird has surged in New Hampshire: up 437% on the route-weighted index since 1968.

Eastern Bluebird Population Forecast in New Hampshire

If the recent trend holds, Eastern Bluebird in New Hampshire is projected to fall about 31% by 2030 — from 2.6 in 2025 to a central estimate of 1.8 (95% range 0.75–2.8). A 5-year backtest shows a typical error of ±58.1%, with 0% of held-out values landing inside the 95% band.

-31%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 →
1.8Projected 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 →
0.75–2.895% 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 →
±58.1%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, Eastern Bluebird in New Hampshire is projected to fall about 31% by 2030 — from 2.6 in 2025 to a central estimate of 1.8 (95% range 0.75–2.8). A 5-year backtest shows a typical error of ±58.1%, with 0% 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 →
20261.70.652.7
20271.70.672.8
20281.70.702.8
20291.80.722.8
20301.80.752.8

Eastern Bluebird Survey Routes in New Hampshire

Routes recording Eastern Bluebird 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 →
Dover920251966
Strafford620251966
Fitzwilliam420251966
Epsom420251966
Concord420251966
Canterbury420251969
Stratford419951966
Glen420251975
Wilmot320251966
Mt Chocorua320251969
Marlow320251966
Milan320251976
Peterborough220251966
Hopkinton220251967
Gilmantn I W220251972
Crawford Not219721970
Franconia220221967
Dixvil Notch220121970
East Kingston220252001
Dixville Notch 2220252023
Brentwood119981971
Walpole120251968
Lempster120241969
Jefferson Hl120251983
Clarksville120251995

Eastern Bluebird Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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