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

White-crowned Sparrow Population Trend in Washington

All statesGeneralists

White-crowned Sparrow in Washington has held roughly steady: down 9% on the route-weighted index since 1970.

-9%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 →
56YearsYears 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 30% by 2029 — from 7.9 in 2024 to a central estimate of 5.6 (95% range 2.0–9.2). A 5-year backtest shows a typical error of ±26%, with 100% of held-out values landing inside the 95% band.

-30%Change by 2029TrendPercent 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 →
5.6Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
2.0–9.295% 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 →
±26%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 30% by 2029 — from 7.9 in 2024 to a central estimate of 5.6 (95% range 2.0–9.2). A 5-year backtest shows a typical error of ±26%, with 100% of held-out values landing inside the 95% band.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 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 →
20255.72.19.3
20265.72.19.3
20275.72.19.3
20285.62.09.2
20295.62.09.2

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 Angeles6720241970
Snowden4620241971
Rainier4420191993
Warm Beach4220171968
Kendall4220241981
Vashon Is.4120241995
Mcchord3620151996
Everett2720241975
Cougar2320231968
Bay View2320171993
Mukilteo2220241993
Leavenworth2020241982
Deception2020181992
Issaquah1819871969
Raymond 21820242022
Mendota1819881977
Carnation1820241988
Warm Beach 21620242018
Newhalem1520241968
Taholah1520221969
South Elma1220241975
Concrete1220242013
Hurricane Rg1120241992
L. Wenatchee1120241994
Montesand1020241988

White-crowned Sparrow Population Trend in Other States

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