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

House Sparrow Population Trend in Washington

All statesGeneralists

House 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 →
82Routes 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 House 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 House Sparrow in Washington. See the full index history below.

House Sparrow Population Forecast in Washington

If the recent trend holds, House Sparrow in Washington is projected to fall about 55% by 2030 — from 13 in 2025 to a central estimate of 6.1 (95% range 0.00–24). A 5-year backtest shows a typical error of ±35.6%, with 100% of held-out values landing inside the 95% band.

-55%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 →
6.1Projected 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 →
0.00–2495% 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 →
±35.6%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, House Sparrow in Washington is projected to fall about 55% by 2030 — from 13 in 2025 to a central estimate of 6.1 (95% range 0.00–24). A 5-year backtest shows a typical error of ±35.6%, 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 →
20267.90.0026
20277.40.0025
20287.00.0025
20296.50.0024
20306.10.0024

House Sparrow Survey Routes in Washington

Routes recording House 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 →
Scootney Reservoir14620252009
Columbia Nwr13020221992
Othello12219911981
Selah11320252000
Moses Lake10920221973
Mesa7320081994
Wapato6420221971
Ewan 26420252023
Malden6220251998
Quincy6120241981
Hartline4120241994
Camas3920181971
Pomona3819991998
Hatton2919941992
Yakima2920251993
Walla Walla2919931993
Asotin2820251981
Snowden2520251971
Reardan2420251968
Odessa2320251993
Potholes2220231996
Carnation2020251988
Twisp1920241969
Harwood1919971993
Bay View1820171993

House Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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