BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

California Quail In Coastal California

All regionsCoastal CaliforniaGeneralists

California Quail in Coastal California has increased: up 34% on the route-weighted index since 1970.

+34%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 RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Coastal California. See the full index history below.

Forecast

If the recent trend holds, California Quail in Coastal California is projected to stay roughly flat through 2029, near 17 (95% range 9.1–25). A 5-year backtest shows a typical error of ±18.9%, with 100% of held-out values landing inside the 95% band.

-3%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 →
17Projected 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 →
9.1–2595% 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 →
±18.9%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 Coastal California is projected to stay roughly flat through 2029, near 17 (95% range 9.1–25). A 5-year backtest shows a typical error of ±18.9%, 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 →
2025179.025
2026179.125
2027179.125
2028179.125
2029179.125

Routes In Coastal California

Routes recording California Quail in Coastal California.
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 →
S CatalinaCALIFORNIA1262022
Lake BerryessaCALIFORNIA802024
CoalingaCALIFORNIA722022
Oak GroveCALIFORNIA572024
White RiverCALIFORNIA561992
JacumbaCALIFORNIA552024
TehamaCALIFORNIA492022
RumseyCALIFORNIA472008
GreenfieldCALIFORNIA472024
Lockwood ValCALIFORNIA452019
JacksonCALIFORNIA451992
ParkfieldCALIFORNIA432024
Red BluffCALIFORNIA382024
PowayCALIFORNIA351980
Yolla BollyCALIFORNIA342024
ColmaCALIFORNIA321972
SangerCALIFORNIA302024
Point ReyesCALIFORNIA292023
Tres Pinos 2CALIFORNIA292011
Yokohl ValCALIFORNIA281997
Carmel ValCALIFORNIA282024
AdelaidaCALIFORNIA282024
AuburnCALIFORNIA271980
Santa Cruz ICALIFORNIA271988
Cal Hot SpgsCALIFORNIA272019

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