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

Grasshopper Sparrow Population Trend in Washington

All statesGrassland birds

Grasshopper Sparrow in Washington has surged: up 102% on the route-weighted index since 1973.

+102%Since 1973
44Routes In State
50Years

Notable Grasshopper Sparrow Trends in Washington

long arc increasecomputed index

Grasshopper Sparrow has surged in Washington: up 102% on the route-weighted index since 1973.

Grasshopper Sparrow Population Forecast in Washington

If the recent trend holds, Grasshopper Sparrow in Washington is projected to rise about 637% by 2029 — from 0.19 in 2024 to a central estimate of 1.4 (95% range 0.35–2.5). A 5-year backtest shows a typical error of ±429.9%, with 20% of held-out values landing inside the 95% band.

+637%Change by 2029
1.4Projected 2029 index
0.35–2.595% range
±429.9%Backtest error
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 index95% low95% high
20251.40.292.4
20261.40.312.4
20271.40.322.5
20281.40.342.5
20291.40.352.5

Grasshopper Sparrow Survey Routes in Washington

Routes recording Grasshopper Sparrow in Washington.
Arid Land Er2919961988
Hatton2919941992
Ewan1620191983
Bickleton1220191996
Richland720242006
Hanford Site619961988
Harrington620051988
Wilbur520191983
Kamilche419711971
Laurier420221998
Snowden319861986
Sulphur320221995
Deer Park320152015
Mercer220181982
Winthrop219921992
Ilwaco219971997
Waitsburg220032003
Brewster120181977
Chewelah120061993
Ewan 2120232023
Turnbull Nwr120231994
L Pend O Nwr120082008
Moses Lake120141973
Reardan120221968
Columbia Nwr120151992

Grasshopper Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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