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

Chipping Sparrow Population Trend in Oregon

All statesForest birds

Chipping Sparrow in Oregon has edged down: down 20% on the route-weighted index since 1970.

-20%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 →
119Routes 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 Chipping 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 Chipping Sparrow in Oregon. See the full index history below.

Chipping Sparrow Population Forecast in Oregon

If the recent trend holds, Chipping Sparrow in Oregon is projected to fall about 24% by 2030 — from 8.2 in 2025 to a central estimate of 6.3 (95% range 3.3–9.2). A 5-year backtest shows a typical error of ±13.6%, with 100% of held-out values landing inside the 95% band.

-24%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 →
6.3Projected 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 →
3.3–9.295% 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 →
±13.6%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, Chipping Sparrow in Oregon is projected to fall about 24% by 2030 — from 8.2 in 2025 to a central estimate of 6.3 (95% range 3.3–9.2). A 5-year backtest shows a typical error of ±13.6%, 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 →
20266.63.69.5
20276.53.69.4
20286.43.59.4
20296.33.49.3
20306.33.39.2

Chipping Sparrow Survey Routes in Oregon

Routes recording Chipping 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 →
Ochoco8719821972
Barnes Val5719871971
Barnhouse5320251998
Wallowa4920252025
Eagle Creek4220251993
Sisters3820251997
Monument3420251993
Lapham Res.3320251992
Hells Canyon3220251992
Newbridge3220251992
Hash Rock3020251983
Bly 23020252007
Paisley2920251973
Silvies2720241994
Black Mtn.2620041993
Donnelly2520061994
Troy2220251992
Wickiup2120251969
Camp Sherman2019961972
Howard Mdws.2020251992
Desolation2020251993
Silver Creek1920251984
Lakeview1920251996
Flora1820231986
Bly1820011973

Chipping Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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