BirdAnalyst
Species · Washington · BBS 2026 Release · 1966–2025

Cassin's Finch Population Trend in Washington

All statesForest birds

Cassin's Finch in Washington has declined: down 35% on the route-weighted index since 1970.

-35%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 →
42Routes 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 Cassin's Finch 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 Cassin's Finch in Washington. See the full index history below.

Cassin's Finch Population Forecast in Washington

If the recent trend holds, Cassin's Finch in Washington is projected to fall about 68% by 2030 — from 2.7 in 2025 to a central estimate of 0.87 (95% range 0.00–2.4). A 5-year backtest shows a typical error of ±64.5%, with 80% 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 →
0.87Projected 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 →
0.00–2.495% 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 →
±64.5%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, Cassin's Finch in Washington is projected to fall about 68% by 2030 — from 2.7 in 2025 to a central estimate of 0.87 (95% range 0.00–2.4). A 5-year backtest shows a typical error of ±64.5%, 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 →
20260.970.002.5
20270.940.002.5
20280.920.002.5
20290.890.002.4
20300.870.002.4

Cassin's Finch Survey Routes in Washington

Routes recording Cassin's Finch 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 →
Omak Creek3820241996
Blewett Pass3020251992
Ellensburg2820251981
Cloverland1920251993
Lake Chelan1620251988
Harwood1219931993
Ardenvoir1119871971
Ronald1020251973
E. Mt. Adams520231995
Twin Lakes520251983
Packwood520051976
Spring Lake520251982
Pomeroy520241993
Warm Beach419911991
Snowden420221973
Tonasket420151984
Curlew420131992
Deer Park420121994
Chewelah320191977
L Pend O Nwr320241995
Rimrock320251968
Asotin320251984
White Chuck320122012
Nighthawk320251995
Mt St Helens320181998

Cassin's Finch Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadanew-mexicooregonsouth-dakotautahwyoming

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