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

Savannah Sparrow Population Trend in Washington

All statesGrassland birds

Savannah Sparrow in Washington has increased: up 30% on the route-weighted index since 1970.

+30%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 →
93Routes 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 Savannah 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 Savannah Sparrow in Washington. See the full index history below.

Savannah Sparrow Population Forecast in Washington

If the recent trend holds, Savannah Sparrow in Washington is projected to stay roughly flat through 2030, near 5.5 (95% range 2.2–8.7). A 5-year backtest shows a typical error of ±19.4%, with 100% of held-out values landing inside the 95% band.

+6%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 →
5.5Projected 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 →
2.2–8.795% 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 →
±19.4%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, Savannah Sparrow in Washington is projected to stay roughly flat through 2030, near 5.5 (95% range 2.2–8.7). A 5-year backtest shows a typical error of ±19.4%, 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 →
20265.62.38.8
20275.52.38.8
20285.52.28.8
20295.52.28.8
20305.52.28.7

Savannah Sparrow Survey Routes in Washington

Routes recording Savannah 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 Angeles5220251970
Ewan5020191985
Chewelah3720211977
Malden3420251998
Bay View2920171993
Asotin2720251983
Keystone2420251994
Reardan1820251968
Harrington1720121981
South Elma1720241975
Odessa1720251993
Ewan 21720252023
Camas1620091977
Bickleton1520151987
Mendota1519881977
Mendota 21520001989
Kendall1320251981
Warm Beach1220171968
Wilbur1220251984
Carnation1020241988
Mcchord1020151996
Pomeroy920241998
Warm Beach 2920242018
Lake Chelan720192006
Hartline620241994

Savannah Sparrow Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawest-virginiawisconsinwyoming

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