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

Black-headed Grosbeak In Coastal California

All regionsCoastal CaliforniaGeneralists

Black-headed Grosbeak in Coastal California has edged down: down 16% on the route-weighted index since 1970.

-16%Since 1970
114Routes In Region
56Years

Notable Signals

No notable trend signals for Black-headed Grosbeak in Coastal California. See the full index history below.

Forecast

If the recent trend holds, Black-headed Grosbeak in Coastal California is projected to stay roughly flat through 2029, near 7.2 (95% range 4.1–10). A 5-year backtest shows a typical error of ±21.4%, with 100% of held-out values landing inside the 95% band.

+6%Change by 2029
7.2Projected 2029 index
4.1–1095% range
±21.4%Backtest error
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 index95% low95% high
20257.44.310
20267.34.310
20277.34.210
20287.24.210
20297.24.110

Routes In Coastal California

Routes recording Black-headed Grosbeak in Coastal California.
Mt BaldyCALIFORNIA692024
White RiverCALIFORNIA491992
Lake SuccessCALIFORNIA331996
Bartlett SpsCALIFORNIA332018
Cuyamaca PkCALIFORNIA322024
Cal Hot SpgsCALIFORNIA312019
StonyfordCALIFORNIA292018
CohassetCALIFORNIA272024
JacksonCALIFORNIA251992
Elsinore MtnCALIFORNIA232024
San Benito Mtn.CALIFORNIA222009
RumseyCALIFORNIA212008
Point ReyesCALIFORNIA212023
Hough SpringsCALIFORNIA192007
Mt PinosCALIFORNIA182004
Green ValleyCALIFORNIA182023
TomheadCALIFORNIA172011
Yokohl ValCALIFORNIA151997
Oak GroveCALIFORNIA152024
OnoCALIFORNIA152011
Elizabeth LkCALIFORNIA152016
Foster ParkCALIFORNIA141994
FolsomCALIFORNIA142024
TujungaCALIFORNIA142021
Gold HillCALIFORNIA142024

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