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

Eastern Bluebird Population Trend in New Hampshire

All statesForest birds

Eastern Bluebird in New Hampshire has surged: up 393% on the route-weighted index since 1968.

+393%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 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 393% 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 52% by 2029 — from 3.5 in 2024 to a central estimate of 1.7 (95% range 0.67–2.7). A 5-year backtest shows a typical error of ±47.8%, with 20% of held-out values landing inside the 95% band.

-52%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 →
1.7Projected 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 →
0.67–2.795% 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 →
±47.8%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 52% by 2029 — from 3.5 in 2024 to a central estimate of 1.7 (95% range 0.67–2.7). A 5-year backtest shows a typical error of ±47.8%, with 20% 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 →
20251.60.572.6
20261.60.602.6
20271.60.622.7
20281.70.652.7
20291.70.672.7

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 →
Dover1420241966
Fitzwilliam920241966
East Kingston820242001
Walpole720241968
Concord620241966
Canterbury620241969
Peterborough520241966
Strafford520241966
Gilmantn I W420241972
Stratford419951966
Mt Chocorua320241969
Marlow320241966
Dixville Notch 2320232023
Hopkinton220241967
Crawford Not219721970
Franconia220221967
Dixvil Notch220121970
Glen220241975
Brentwood119981971
Epsom120231966
Wilmot120231966
Lempster120241969
Jefferson Hl120241983
Milan120241976
Clarksville120101995

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 2026-05-22.