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

Evening Grosbeak Population Trend in Washington

All statesGeneralists

Evening Grosbeak in Washington has fallen sharply: down 69% on the route-weighted index since 1970.

-69%Since 1970
75Routes In State
56Years

Notable Evening Grosbeak Trends in Washington

long arc declinecomputed index

Evening Grosbeak has fallen sharply in Washington: down 69% on the route-weighted index since 1970.

Evening Grosbeak Population Forecast in Washington

If the recent trend holds, Evening Grosbeak in Washington is projected to rise about 14% by 2029 — from 1.9 in 2024 to a central estimate of 2.2 (95% range 0.00–9.0). A 5-year backtest shows a typical error of ±85.3%, with 100% of held-out values landing inside the 95% band.

+14%Change by 2029
2.2Projected 2029 index
0.00–9.095% range
±85.3%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
20252.50.009.3
20262.40.009.2
20272.40.009.1
20282.30.009.1
20292.20.009.0

Evening Grosbeak Survey Routes in Washington

Routes recording Evening Grosbeak in Washington.
Omak Creek2920221996
Winthrop2820091985
E. Mt. Adams2020241995
L. Wenatchee1520241993
Newhalem1420241968
Neilton1319751975
Raymond 2820242023
Mt Rainier820151991
Mendota 2720002000
Ronald720241973
Deer Park720011994
Cusick620241984
Carlton620131992
Nighthawk620131992
Mt. Adams620241993
Curlew520181993
Kendall420241981
Packwood420241976
Hurricane Rg420241992
Mt St Helens420242014
Greenwater420232015
Chewelah320191977
Ardenvoir319871969
Reardan319861972
Ellensburg320141981

Evening Grosbeak Population Trend in Other States

arizonacaliforniacoloradoconnecticutidahomainemassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwisconsinwyoming

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