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

Brewer's Sparrow Population Trend in Washington

All statesGeneralists

Brewer's Sparrow in Washington has surged: up 302% on the route-weighted index since 1970.

+302%Since 1970
37Routes In State
55Years

Notable Brewer's Sparrow Trends in Washington

long arc increasecomputed index

Brewer's Sparrow has surged in Washington: up 302% on the route-weighted index since 1970.

Brewer's Sparrow Population Forecast in Washington

If the recent trend holds, Brewer's Sparrow in Washington is projected to rise about 162% by 2029 — from 0.63 in 2024 to a central estimate of 1.7 (95% range 0.00–4.2). A 5-year backtest shows a typical error of ±92.5%, with 100% of held-out values landing inside the 95% band.

+162%Change by 2029
1.7Projected 2029 index
0.00–4.295% range
±92.5%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
20251.60.004.1
20261.60.004.2
20271.60.004.2
20281.60.004.2
20291.70.004.2

Brewer's Sparrow Survey Routes in Washington

Routes recording Brewer's Sparrow in Washington.
Selah4020232000
Pomona2419991998
Ellensburg1820241981
Lake Chelan1120191992
Bickleton820191990
Moses Coulee820231993
Odessa820241993
Keystone620241994
Asotin420141971
Nighthawk420231992
Arid Land Er319961989
Tonasket320181982
Horn Rapids320112008
Hanford Site219961994
Twisp220081972
Brewster220181979
Winthrop219901990
Sulphur220141997
Quincy220231985
Wilbur220191989
Cloverland220242024
Chewelah119921992
Turnbull Nwr120072007
Ewan 2120232023
L Pend O Nwr120011999

Brewer's Sparrow Population Trend in Other States

arizonacaliforniacoloradoidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwyoming

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