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

Grasshopper Sparrow Population Trend in Oregon

All statesGrassland birds

Grasshopper Sparrow in Oregon has declined: down 28% on the route-weighted index since 1973.

-28%Since 1973TrendPercent 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 →
25Routes 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 →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Grasshopper Sparrow Trends in OregonNotable 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 Grasshopper Sparrow in Oregon. See the full index history below.

Grasshopper Sparrow Population Forecast in Oregon

If the recent trend holds, Grasshopper Sparrow in Oregon is projected to stay roughly flat through 2029, near 0.04 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±137.4%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.04Projected 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 →
0.00–0.1595% 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 →
±137.4%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, Grasshopper Sparrow in Oregon is projected to stay roughly flat through 2029, near 0.04 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±137.4%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.040.000.15
20260.040.000.15
20270.040.000.15
20280.040.000.15
20290.040.000.15

Grasshopper Sparrow Survey Routes in Oregon

Routes recording Grasshopper Sparrow in Oregon.
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 →
Umpqua420211969
Blitzen419901975
Unity419941994
Garfield319791979
Lone Rock220151990
Ordnance219731973
Albee219981998
Crowley220061983
Montague219961996
Umatilla220211988
Imnaha119991995
Fandango Can119781978
Adair120242024
Joseph120051972
Eightmile119981988
Pendleton120141987
Elkton120102007
Adrian120101995
Mikkalo120171996
Cecil119981998
Troy120171994
Merrill120062006
Salem120152015
Prospect119951995
Sams Valley120212018

Grasshopper Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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