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Species · Washington · BBS 2026 Release · 1966–2025

Pine Siskin Population Trend in Washington

All statesForest birds

Pine Siskin in Washington has edged down: down 19% on the route-weighted index since 1970.

-19%Since 1970TrendPercent 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 →
81Routes 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 →
57YearsYears 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 WashingtonNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Pine Siskin in Washington. See the full index history below.

Pine Siskin Population Forecast in Washington

If the recent trend holds, Pine Siskin in Washington is projected to fall about 39% by 2030 — from 8.4 in 2025 to a central estimate of 5.1 (95% range 0.00–11). A 5-year backtest shows a typical error of ±86.6%, with 80% of held-out values landing inside the 95% band.

-39%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 →
5.1Projected 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 →
0.00–1195% 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 →
±86.6%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 Washington is projected to fall about 39% by 2030 — from 8.4 in 2025 to a central estimate of 5.1 (95% range 0.00–11). A 5-year backtest shows a typical error of ±86.6%, with 80% of held-out values landing inside the 95% band.19682030
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 →
20265.20.0011
20275.20.0011
20285.20.0011
20295.10.0011
20305.10.0011

Pine Siskin Survey Routes in Washington

Routes recording Pine Siskin in Washington.
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 →
Mt Rainier7220191990
Blewett Pass5520251992
Omak Creek5320241996
Leavenworth4520241981
Cusick4020251982
Vashon Is.3520251995
Sullivan Lake 23420252000
Sullivan Lk3119991999
Port Angeles3020251970
E. Mt. Adams2720251996
Twin Lakes2520251983
Rimrock2320251968
Mazama2320221993
L Pend O Nwr2220241995
Glacier2120241975
Issaquah2019871969
L. Wenatchee2020251994
No Cascades1920191988
Hurricane Rg1620251992
Lake Chelan1420251988
Deer Park1220121994
Mukilteo1120251994
Newhalem1020241968
Ellensburg1020251981
Index 21020232023

Pine Siskin Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahoiowamainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawest-virginiawisconsinwyoming

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