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

California Quail Population Trend in Nevada

All statesGeneralists

California Quail in Nevada has surged: up 39× on the route-weighted index since 1970.

39×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 →
23Routes 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 →
44YearsYears 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 NevadaNotable 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 Nevada: up 39× on the route-weighted index since 1970.

California Quail Population Forecast in Nevada

If the recent trend holds, California Quail in Nevada is projected to stay roughly flat through 2029, near 6.8 (95% range 2.4–11). A 5-year backtest shows a typical error of ±40.3%, with 100% of held-out values landing inside the 95% band.

-2%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 →
6.8Projected 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 →
2.4–1195% 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 →
±40.3%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 Nevada is projected to stay roughly flat through 2029, near 6.8 (95% range 2.4–11). A 5-year backtest shows a typical error of ±40.3%, with 100% 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 →
20256.41.911
20266.52.011
20276.62.111
20286.72.311
20296.82.411

California Quail Survey Routes in Nevada

Routes recording California Quail in Nevada.
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 →
Fallon14720241992
Carson River6520052001
Nixon1920241975
Sand Pass1220241987
Gardnerville1120121992
Chimney Res.620242007
Willis519951994
Gardnerville 2520242013
Piute Mdws320242014
Rye Patch319871970
Oreana320032002
Comins Lake220092005
Ranchogrande220242024
Midas120012001
Fish Creek120081997
Virgin Creek120181995
Frenchman119781977
Toiyabe Nf119871987
Ruby Valley 2120242024
Majors Place119721968
Jarbidge120122012
Mill City120172016
Bald Mtn.120122012

California Quail Population Trend in Other States

californiaidahomontananew-mexicooregonutahwashington

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