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

White-crowned Sparrow Population Trend in Washington

All statesForest birds

White-crowned Sparrow in Washington has held roughly steady: up 0% on the route-weighted index since 1970.

+0%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 →
65Routes 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 White-crowned Sparrow 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 White-crowned Sparrow in Washington. See the full index history below.

White-crowned Sparrow Population Forecast in Washington

If the recent trend holds, White-crowned Sparrow in Washington is projected to fall about 34% by 2030 — from 8.7 in 2025 to a central estimate of 5.8 (95% range 2.1–9.4). A 5-year backtest shows a typical error of ±27.2%, with 100% of held-out values landing inside the 95% band.

-34%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 →
5.8Projected 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 →
2.1–9.495% 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 →
±27.2%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, White-crowned Sparrow in Washington is projected to fall about 34% by 2030 — from 8.7 in 2025 to a central estimate of 5.8 (95% range 2.1–9.4). A 5-year backtest shows a typical error of ±27.2%, with 100% 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 →
20265.92.39.5
20275.92.29.5
20285.82.29.5
20295.82.29.4
20305.82.19.4

White-crowned Sparrow Survey Routes in Washington

Routes recording White-crowned Sparrow 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 →
Port Angeles7820251970
Snowden5120251971
Kendall5120251981
Warm Beach4220171968
Rainier3820251993
Mcchord3620151996
Everett2420251975
Cougar2320231968
Bay View2320171993
Newhalem2120251968
Leavenworth2020241982
L. Wenatchee2020251994
Deception2020181992
Mukilteo1920251993
Vashon Is.1920251995
Issaquah1819871969
Raymond 21820242022
Mendota1819881977
Warm Beach 21620242018
Taholah1520221969
South Elma1220241975
Carnation1220251988
Ronald1120251989
Montesand1020241988
Nighthawk1019921992

White-crowned Sparrow Population Trend in Other States

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