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Species · Washington · BBS 2025 Release · 1966–2024

Pine Siskin Population Trend in Washington

All statesGeneralists

Pine Siskin in Washington has declined: down 37% on the route-weighted index since 1970.

-37%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 →
56YearsYears 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 62% by 2029 — from 13 in 2024 to a central estimate of 4.9 (95% range 0.00–11). A 5-year backtest shows a typical error of ±81.8%, with 80% of held-out values landing inside the 95% band.

-62%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 →
4.9Projected 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 →
0.00–1195% 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 →
±81.8%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, Pine Siskin in Washington is projected to fall about 62% by 2029 — from 13 in 2024 to a central estimate of 4.9 (95% range 0.00–11). A 5-year backtest shows a typical error of ±81.8%, with 80% of held-out values landing inside the 95% band.19682029
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 →
20255.00.0011
20265.00.0011
20275.00.0011
20284.90.0011
20294.90.0011

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
Sullivan Lake 26120242000
E. Mt. Adams5720241996
Omak Creek5320241996
Twin Lakes5220241983
Mt. Adams5220241993
Ronald4820241973
L. Wenatchee4820241994
Leavenworth4520241981
Vashon Is.3620241995
Sullivan Lk3119991999
Rimrock2820241968
Blewett Pass2520241992
Mazama2320221993
Port Angeles2220241970
Cloverland2220242003
L Pend O Nwr2220241995
Glacier2120241975
Issaquah2019871969
Lake Chelan1920241988
No Cascades1920191988
Cusick1820241982
Hurricane Rg1520241992
Deer Park1220121994
Newhalem1020241968

Pine Siskin Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.