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

White-crowned Sparrow In Coastal California

All regionsCoastal CaliforniaGeneralists

White-crowned Sparrow in Coastal California has collapsed: down 86% on the route-weighted index since 1970.

-86%Since 1970
17Routes In Region
43Years

Notable Signals

long arc declinecomputed index

White-crowned Sparrow has collapsed in Coastal California: down 86% on the route-weighted index since 1970.

Forecast

If the recent trend holds, White-crowned Sparrow in Coastal California is projected to fall about 100% by 2024 — from 0.21 in 2019 to a central estimate of 0.00 (95% range 0.00–0.38). A 5-year backtest shows a typical error of ±124.8%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2024
0.00Projected 2024 index
0.00–0.3895% range
±124.8%Backtest error
19682024
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
20200.000.000.38
20210.000.000.38
20220.000.000.38
20230.000.000.38
20240.000.000.38

Routes In Coastal California

Routes recording White-crowned Sparrow in Coastal California.
ColmaCALIFORNIA301972
TiptonCALIFORNIA131972
Morro BayCALIFORNIA112019
Yokohl ValCALIFORNIA71973
Cp. PendletonCALIFORNIA51991
Waterman GapCALIFORNIA41972
Oak GroveCALIFORNIA31982
FairfaxCALIFORNIA32015
Tres PinosCALIFORNIA21973
MoragaCALIFORNIA21977
CalpellaCALIFORNIA11977
CollegevilleCALIFORNIA11973
Point ReyesCALIFORNIA12006
Gold HillCALIFORNIA11972
Yolla BollyCALIFORNIA12002
OnealsCALIFORNIA11997
PescaderoCALIFORNIA12013

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