BirdAnalyst
Species · Washington · BBS 2025 Release · 1966–2024

Black-headed Grosbeak Population Trend in Washington

All statesGeneralists

Black-headed Grosbeak in Washington has surged: up 271% on the route-weighted index since 1970.

+271%Since 1970
102Routes In State
56Years

Notable Black-headed Grosbeak Trends in Washington

long arc increasecomputed index

Black-headed Grosbeak has surged in Washington: up 271% on the route-weighted index since 1970.

Black-headed Grosbeak Population Forecast in Washington

If the recent trend holds, Black-headed Grosbeak in Washington is projected to stay roughly flat through 2029, near 10.0 (95% range 8.4–12). A 5-year backtest shows a typical error of ±7.7%, with 80% of held-out values landing inside the 95% band.

+8%Change by 2029
10.0Projected 2029 index
8.4–1295% range
±7.7%Backtest error
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 index95% low95% high
20259.47.811
20269.57.911
20279.78.111
20289.88.211
202910.08.412

Black-headed Grosbeak Survey Routes in Washington

Routes recording Black-headed Grosbeak in Washington.
Kendall3920241981
Mendota 23720001989
Pe Ell3420231993
Cougar3220231970
Mendota 33220242005
Everett2820241975
Concrete2720242013
Warm Beach2520171968
Mukilteo2520241993
Snowden2420241973
Lake Chelan2320241988
Raymond 22320242022
Vashon Is.2120241995
Newhalem2020241968
Rainier1920191993
Ellensburg1820241981
Deception1820181992
Blewett Pass1720241995
Twisp1620241970
Ardenvoir1519871969
South Elma1520241975
Bay View1420171993
Montesand1420241987
Ronald1320241973
White Chuck1320241992

Black-headed Grosbeak Population Trend in Other States

alaskaarizonacaliforniacoloradoidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwyoming

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