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

Pine Siskin Population Trend in New Hampshire

All statesForest birds

Pine Siskin in New Hampshire has collapsed: down 86% on the route-weighted index since 1969.

-86%Since 1969TrendPercent 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 →
18Routes 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 →
41YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Pine Siskin 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 →

Pine Siskin has collapsed in New Hampshire: down 86% on the route-weighted index since 1969.

Pine Siskin Population Forecast in New Hampshire

If the recent trend holds, Pine Siskin in New Hampshire is projected to fall about 68% by 2030 — from 0.13 in 2025 to a central estimate of 0.04 (95% range 0.00–3.3). A 5-year backtest shows a typical error of ±205%, with 100% of held-out values landing inside the 95% band.

-68%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 →
0.04Projected 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 →
0.00–3.395% 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 →
±205%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, Pine Siskin in New Hampshire is projected to fall about 68% by 2030 — from 0.13 in 2025 to a central estimate of 0.04 (95% range 0.00–3.3). A 5-year backtest shows a typical error of ±205%, 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 →
20260.120.003.4
20270.100.003.3
20280.080.003.3
20290.060.003.3
20300.040.003.3

Pine Siskin Survey Routes in New Hampshire

Routes recording Pine Siskin 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 →
Clarksville1020091969
Crawford Not619711969
Walpole520152015
Marlow420011982
Lempster220252025
Jefferson Hl219991968
Dixvil Notch219981970
Fitzwilliam120242024
Dover119901988
Epsom119851984
Concord120151997
Strafford120092009
East Kingston120092009
Mt Chocorua120221980
Franconia120251966
Milan120091968
Stratford119991966
Jeffers Ntch120071998

Pine Siskin Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahoiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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