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

Song Sparrow Population Trend in Washington

All statesForest birds

Song Sparrow in Washington has held roughly steady: down 4% on the route-weighted index since 1970.

-4%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 →
112Routes 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 Song 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 Song Sparrow in Washington. See the full index history below.

Song Sparrow Population Forecast in Washington

If the recent trend holds, Song Sparrow in Washington is projected to fall about 13% by 2030 — from 14 in 2025 to a central estimate of 12 (95% range 8.0–16). A 5-year backtest shows a typical error of ±11.9%, with 100% of held-out values landing inside the 95% band.

-13%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 →
12Projected 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 →
8.0–1695% 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 →
±11.9%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, Song Sparrow in Washington is projected to fall about 13% by 2030 — from 14 in 2025 to a central estimate of 12 (95% range 8.0–16). A 5-year backtest shows a typical error of ±11.9%, 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 →
2026128.216
2027128.216
2028128.116
2029128.116
2030128.016

Song Sparrow Survey Routes in Washington

Routes recording Song 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 →
Mukilteo5820251993
South Elma5620241975
Mendota 25420001989
Ozette4920251971
Mendota4719881977
Warm Beach4420171968
Vashon Is.4320251995
Mendota 34220252005
Everett4120251975
Montesand4120241986
Raymond 23920242022
Port Angeles3820251970
Carnation3620251988
Waitsburg3620041994
Raymond3220211993
Kamilche3020251968
Kendall3020251981
Pe Ell3020251993
Bunker Hill2920251968
Issaquah2719871969
Ilwaco2320251975
Leavenworth2120241981
Rainier2120251993
Chewelah1720211977
Newhalem1620251968

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawest-virginiawisconsinwyoming

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