BirdAnalyst
Species · BCR 32 · BBS 2026 Release · 1966–2025

California Quail In Coastal California

All regionsCoastal CaliforniaGame birds

California Quail in Coastal California has increased: up 48% on the route-weighted index since 1970.

+48%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 →
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 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.

California Quail In Coastal California Population Forecast

If the recent trend holds, California Quail in Coastal California is projected to fall about 19% by 2030 — from 21 in 2025 to a central estimate of 17 (95% range 9.5–25). A 5-year backtest shows a typical error of ±20.4%, with 100% of held-out values landing inside the 95% band.

-19%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 →
17Projected 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 →
9.5–2595% 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 →
±20.4%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 fall about 19% by 2030 — from 21 in 2025 to a central estimate of 17 (95% range 9.5–25). A 5-year backtest shows a typical error of ±20.4%, 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 →
2026179.425
2027179.425
2028179.425
2029179.425
2030179.525

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 CatalinaCALIFORNIA1522025
Lake BerryessaCALIFORNIA922025
AdelaidaCALIFORNIA792025
CoalingaCALIFORNIA722022
White RiverCALIFORNIA561992
Yolla BollyCALIFORNIA502025
TehamaCALIFORNIA492022
RumseyCALIFORNIA472008
JacumbaCALIFORNIA472025
Lockwood ValCALIFORNIA452019
JacksonCALIFORNIA451992
PowayCALIFORNIA351980
Oak GroveCALIFORNIA332025
ColmaCALIFORNIA321972
GreenfieldCALIFORNIA312025
SangerCALIFORNIA302024
Tres Pinos 2CALIFORNIA292011
Yokohl ValCALIFORNIA281997
AuburnCALIFORNIA271980
Cuyamaca PkCALIFORNIA272025
Santa Cruz ICALIFORNIA271988
Cal Hot SpgsCALIFORNIA272019
Red BluffCALIFORNIA262025
SisquocCALIFORNIA262014
OnoCALIFORNIA252012

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