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

California Quail Population Trend in Idaho

All statesGeneralists

California Quail in Idaho has increased: up 33% on the route-weighted index since 1972.

+33%Since 1972TrendPercent 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 California Quail Trends in IdahoNotable 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 Idaho. See the full index history below.

California Quail Population Forecast in Idaho

If the recent trend holds, California Quail in Idaho is projected to fall about 17% by 2029 — from 1.7 in 2024 to a central estimate of 1.4 (95% range 0.54–2.3). A 5-year backtest shows a typical error of ±125.5%, with 60% of held-out values landing inside the 95% band.

-17%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 →
1.4Projected 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 →
0.54–2.395% 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 →
±125.5%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 Idaho is projected to fall about 17% by 2029 — from 1.7 in 2024 to a central estimate of 1.4 (95% range 0.54–2.3). A 5-year backtest shows a typical error of ±125.5%, with 60% 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 →
20251.40.482.3
20261.40.502.3
20271.40.512.3
20281.40.532.3
20291.40.542.3

California Quail Survey Routes in Idaho

Routes recording California Quail in Idaho.
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 →
Picabo2920212015
Pasadena Val1920161987
Gifford1720171971
Crane Creek1420191988
Cedar Hill1320242002
Triangle1220241985
Glenns Ferry1119861985
Silver City1120241993
Centerville720191983
Joel520241990
Mora520192018
Rochat Divde420232022
Dougal Res420181992
Blacks Creek320171968
Nezperce220051992
Cascade219681968
Coolin220241999
Mivoden120222003
Grangeville120212012
Magic Mtn120221994
Salmon River120182004
Featherville120211992
Hot Spring120121988
Preston119911991
Cabarton120162000

California Quail Population Trend in Other States

californiamontananevadanew-mexicooregonutahwashington

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