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

House Finch In Coastal California

All regionsCoastal CaliforniaGeneralists

House Finch in Coastal California has edged down: down 23% on the route-weighted index since 1970.

-23%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 →
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 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 24% by 2029 — from 58 in 2024 to a central estimate of 44 (95% range 28–60). A 5-year backtest shows a typical error of ±26.1%, with 20% of held-out values landing inside the 95% band.

-24%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 →
44Projected 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 →
28–6095% 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 →
±26.1%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 24% by 2029 — from 58 in 2024 to a central estimate of 44 (95% range 28–60). A 5-year backtest shows a typical error of ±26.1%, with 20% 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 →
2025463062
2026462962
2027452961
2028452861
2029442860

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
ParkfieldCALIFORNIA1872024
CaruthersCALIFORNIA1741987
OrovilleCALIFORNIA1602024
PowayCALIFORNIA1531980
Tres Pinos 2CALIFORNIA1532011
WestleyCALIFORNIA1492024
HughsonCALIFORNIA1412024
TranquillityCALIFORNIA1382024
Santa Cruz ICALIFORNIA1291988
GravesboroCALIFORNIA1211995
LockwoodCALIFORNIA1192024
Harbor Lake 2CALIFORNIA1182024
GreenfieldCALIFORNIA1162024
SisquocCALIFORNIA1112014
Tres PinosCALIFORNIA1102003
Collegeville 2CALIFORNIA1082023
MorenoCALIFORNIA1052024
PenningtonCALIFORNIA1002024
GlennCALIFORNIA972023
San YsidroCALIFORNIA932019
Harbor LakeCALIFORNIA901991
LivermoreCALIFORNIA891991
El ToroCALIFORNIA881999
Orange CoveCALIFORNIA852016

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