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

Mountain Quail In Coastal California

All regionsCoastal CaliforniaGeneralists

Mountain Quail in Coastal California has edged up: up 11% on the route-weighted index since 1970.

+11%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 →
58Routes 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 Mountain Quail in Coastal California. See the full index history below.

Mountain Quail In Coastal California Population Forecast

If the recent trend holds, Mountain Quail in Coastal California is projected to fall about 41% by 2029 — from 2.9 in 2024 to a central estimate of 1.7 (95% range 0.00–4.9). A 5-year backtest shows a typical error of ±84.4%, with 100% of held-out values landing inside the 95% band.

-41%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 →
1.7Projected 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 →
0.00–4.995% 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 →
±84.4%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, Mountain Quail in Coastal California is projected to fall about 41% by 2029 — from 2.9 in 2024 to a central estimate of 1.7 (95% range 0.00–4.9). A 5-year backtest shows a typical error of ±84.4%, 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 →
20251.80.005.1
20261.80.005.0
20271.80.005.0
20281.70.004.9
20291.70.004.9

Routes In Coastal California

Routes recording Mountain 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 →
Mt BaldyCALIFORNIA852024
Green ValleyCALIFORNIA432023
Cuyamaca PkCALIFORNIA272024
Bartlett SpsCALIFORNIA232018
Lockwood ValCALIFORNIA222019
Lake HemetCALIFORNIA171986
Yolla BollyCALIFORNIA102024
Lake Hemet 2CALIFORNIA92023
StonyfordCALIFORNIA92018
Cal Hot SpgsCALIFORNIA82019
Mt PinosCALIFORNIA72004
AnzaCALIFORNIA71991
LockwoodCALIFORNIA72023
RumseyCALIFORNIA62008
Big BearCALIFORNIA61982
Elsinore MtnCALIFORNIA62024
VentucopaCALIFORNIA61998
Lake SuccessCALIFORNIA51996
Lake BerryessaCALIFORNIA52023
TehamaCALIFORNIA52022
TomheadCALIFORNIA52011
Cleveland NfCALIFORNIA42016
WoodlandsCALIFORNIA42019
CalpellaCALIFORNIA31986
Oak GroveCALIFORNIA32022

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