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

Bobolink Population Trend in New Hampshire

All statesGrassland birds

Bobolink in New Hampshire has fallen sharply: down 68% on the route-weighted index since 1968.

-68%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 →
25Routes 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 Bobolink 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 declinecomputed 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 →

Bobolink has fallen sharply in New Hampshire: down 68% on the route-weighted index since 1968.

Bobolink Population Forecast in New Hampshire

If the recent trend holds, Bobolink in New Hampshire is projected to fall about 11% by 2030 — from 2.1 in 2025 to a central estimate of 1.9 (95% range 0.00–4.5). A 5-year backtest shows a typical error of ±17.3%, with 100% of held-out values landing inside the 95% band.

-11%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 →
1.9Projected 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 →
0.00–4.595% 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 →
±17.3%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, Bobolink in New Hampshire is projected to fall about 11% by 2030 — from 2.1 in 2025 to a central estimate of 1.9 (95% range 0.00–4.5). A 5-year backtest shows a typical error of ±17.3%, with 100% 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 →
20262.50.005.1
20272.30.005.0
20282.20.004.8
20292.00.004.7
20301.90.004.5

Bobolink Survey Routes in New Hampshire

Routes recording Bobolink 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 →
Dixvil Notch1420171966
Dixville Notch 21420252018
Canterbury1120251966
Brentwood419981966
Walpole420251967
Epsom320161966
Gilmantn I W320251969
Marlow320251966
Jefferson Hl320221966
Glen320251975
Fitzwilliam220251966
Hopkinton220251966
Wilmot220241966
Mt Chocorua220251969
Lempster220241966
Franconia220221966
Milan220241966
Clarksville220241966
East Kingston220251999
Peterborough120131966
Dover120251966
Concord120251966
Strafford120161966
Crawford Not119721972
Stratford120251966

Bobolink Population Trend in Other States

californiacoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotautahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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