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

House Finch In Coastal California

All regionsCoastal CaliforniaGeneralists

House Finch in Coastal California has edged down: down 19% on the route-weighted index since 1970.

-19%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 →
121Routes 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 House Finch in Coastal California. See the full index history below.

House Finch In Coastal California Population Forecast

If the recent trend holds, House Finch in Coastal California is projected to fall about 35% by 2030 — from 70 in 2025 to a central estimate of 46 (95% range 28–63). A 5-year backtest shows a typical error of ±31.3%, with 0% of held-out values landing inside the 95% band.

-35%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 →
46Projected 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 →
28–6395% 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 →
±31.3%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, House Finch in Coastal California is projected to fall about 35% by 2030 — from 70 in 2025 to a central estimate of 46 (95% range 28–63). A 5-year backtest shows a typical error of ±31.3%, with 0% 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 →
2026473064
2027473064
2028462964
2029462963
2030462863

Routes In Coastal California

Routes recording House Finch 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 →
ColmaCALIFORNIA2651972
OrovilleCALIFORNIA2072025
ParkfieldCALIFORNIA2002025
HughsonCALIFORNIA1882025
CaruthersCALIFORNIA1741987
LockwoodCALIFORNIA1582025
PowayCALIFORNIA1531980
Tres Pinos 2CALIFORNIA1532011
GreenfieldCALIFORNIA1472025
MorenoCALIFORNIA1382025
TranquillityCALIFORNIA1382024
S CatalinaCALIFORNIA1332025
Santa Cruz ICALIFORNIA1291988
PenningtonCALIFORNIA1272025
GravesboroCALIFORNIA1211995
Harbor Lake 2CALIFORNIA1182024
WestleyCALIFORNIA1132025
SisquocCALIFORNIA1112014
Tres PinosCALIFORNIA1102003
Collegeville 2CALIFORNIA1082023
San YsidroCALIFORNIA932019
Harbor LakeCALIFORNIA901991
ZamoraCALIFORNIA892025
LivermoreCALIFORNIA891991
El ToroCALIFORNIA881999

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