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Species · Oregon · BBS 2026 Release · 1966–2025

California Quail Population Trend in Oregon

All statesGame birds

California Quail in Oregon has edged down: down 17% on the route-weighted index since 1970.

-17%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 →
105Routes 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 California Quail 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 California Quail in Oregon. See the full index history below.

California Quail Population Forecast in Oregon

If the recent trend holds, California Quail in Oregon is projected to fall about 20% by 2030 — from 3.5 in 2025 to a central estimate of 2.8 (95% range 0.67–5.0). A 5-year backtest shows a typical error of ±21%, with 100% of held-out values landing inside the 95% band.

-20%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 →
2.8Projected 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 →
0.67–5.095% 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 →
±21%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, California Quail in Oregon is projected to fall about 20% by 2030 — from 3.5 in 2025 to a central estimate of 2.8 (95% range 0.67–5.0). A 5-year backtest shows a typical error of ±21%, 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 →
20262.90.745.1
20272.90.725.0
20282.90.705.0
20292.80.695.0
20302.80.675.0

California Quail Survey Routes in Oregon

Routes recording California Quail 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 →
Bowden Hills4519991999
Adrian2720251984
Bridgeport2420251987
Ordnance2319791971
Trout Creek2320251996
Sparta2120251971
Deschutes2020251968
Alvord Lake2020251968
Modoc Point 21820252024
Fandango Can1320251978
Pendleton1320251972
Umatilla1320251988
Malheur Res.1320232022
Sheaville1320252012
Mikkalo1220251996
Mount Vernon1120241986
Warner Vally1120241993
Malheur Nwr1020221987
Derby919931968
Newbridge920251992
Mcminnville920251994
Scio820251971
Montague820251974
Madras820251997
Coquille720251994

California Quail Population Trend in Other States

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