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Species · Idaho · BBS 2026 Release · 1966–2025

California Quail Population Trend in Idaho

All statesGame birds

California Quail in Idaho has surged: up 77% on the route-weighted index since 1972.

+77%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 →
47YearsYears 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

California Quail has surged in Idaho: up 77% on the route-weighted index since 1972.

California Quail Population Forecast in Idaho

If the recent trend holds, California Quail in Idaho is projected to stay roughly flat through 2030, near 1.4 (95% range 0.55–2.3). A 5-year backtest shows a typical error of ±107.6%, with 80% of held-out values landing inside the 95% band.

-0%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 →
1.4Projected 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 →
0.55–2.395% 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 →
±107.6%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, California Quail in Idaho is projected to stay roughly flat through 2030, near 1.4 (95% range 0.55–2.3). A 5-year backtest shows a typical error of ±107.6%, with 80% 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 →
20261.40.492.2
20271.40.512.3
20281.40.522.3
20291.40.532.3
20301.40.552.3

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 →
Pasadena Val1920161987
Gifford1720171971
Triangle1620251985
Crane Creek1420191988
Cedar Hill1320242002
Glenns Ferry1119861985
Silver City920251993
Coolin620251999
Centerville520251983
Joel520241990
Rochat Divde420252022
Dougal Res420181992
Mora420252018
Blacks Creek320171968
Picabo320252015
Nezperce220051992
Cascade219681968
Mivoden120252003
Grangeville120212012
Magic Mtn120251994
Salmon River120232004
Featherville120211992
Hot Spring120251988
Preston119911991
Cabarton120162000

California Quail Population Trend in Other States

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