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

Savannah Sparrow Population Trend in Washington

All statesGrassland birds

Savannah Sparrow in Washington has edged up: up 24% on the route-weighted index since 1970.

+24%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 →
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 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 fall about 14% by 2029 — from 6.4 in 2024 to a central estimate of 5.5 (95% range 2.2–8.8). A 5-year backtest shows a typical error of ±19.7%, with 100% of held-out values landing inside the 95% band.

-14%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 →
5.5Projected 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 →
2.2–8.895% 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 →
±19.7%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 fall about 14% by 2029 — from 6.4 in 2024 to a central estimate of 5.5 (95% range 2.2–8.8). A 5-year backtest shows a typical error of ±19.7%, 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 →
20255.62.38.9
20265.62.38.9
20275.62.38.9
20285.62.38.9
20295.52.28.8

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 →
Ewan5020191985
Port Angeles4620241970
Asotin4620241983
Reardan3820241968
Chewelah3720211977
Malden3620241998
Odessa3120241993
Bay View2920171993
Keystone2120241994
Wilbur2020241984
Ewan 21820242023
Harrington1720121981
South Elma1720241975
Camas1620091977
Bickleton1520151987
Mendota1519881977
Mendota 21520001989
Warm Beach1220171968
Kendall1220241981
Carnation1020241988
Mcchord1020151996
Pomeroy920241998
Warm Beach 2920242018
Scootney Reservoir920242009
Everett820241975

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 2026-05-22.