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

Rock Pigeon Population Trend in New Hampshire

All statesGeneralists

Rock Pigeon in New Hampshire has fallen sharply: down 59% on the route-weighted index since 1968.

-59%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 →
22Routes 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 Rock Pigeon 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 →

Rock Pigeon has fallen sharply in New Hampshire: down 59% on the route-weighted index since 1968.

Rock Pigeon Population Forecast in New Hampshire

If the recent trend holds, Rock Pigeon in New Hampshire is projected to rise about 179% by 2030 — from 0.91 in 2025 to a central estimate of 2.5 (95% range 0.00–5.3). A 5-year backtest shows a typical error of ±94.3%, with 100% of held-out values landing inside the 95% band.

+179%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 →
2.5Projected 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 →
0.00–5.395% 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 →
±94.3%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, Rock Pigeon in New Hampshire is projected to rise about 179% by 2030 — from 0.91 in 2025 to a central estimate of 2.5 (95% range 0.00–5.3). A 5-year backtest shows a typical error of ±94.3%, 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 →
20262.60.005.4
20272.60.005.4
20282.60.005.3
20292.60.005.3
20302.50.005.3

Rock Pigeon Survey Routes in New Hampshire

Routes recording Rock Pigeon 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 →
Glen1820241976
Franconia920231970
Strafford819901980
East Kingston820082008
Fitzwilliam620251966
Wilmot620221966
Jefferson Hl620251975
Milan520221966
Peterborough320241968
Hopkinton320251977
Gilmantn I W320221985
Marlow320251970
Canterbury220151970
Stratford220231966
Dixvil Notch220051970
Brentwood119951966
Dover120251966
Epsom120191966
Concord120251966
Mt Chocorua120241968
Walpole120181967
Lempster120251966

Rock Pigeon Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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