BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

White-crowned Sparrow In Sierra Nevada

All regionsSierra NevadaGeneralists

White-crowned Sparrow in Sierra Nevada has collapsed: down 86% on the route-weighted index since 1973.

-86%Since 1973
17Routes In Region
52Years

Notable Signals

long arc declinecomputed index

White-crowned Sparrow has collapsed in Sierra Nevada: down 86% on the route-weighted index since 1973.

Forecast

If the recent trend holds, White-crowned Sparrow in Sierra Nevada is projected to rise about 137% by 2028 — from 0.18 in 2023 to a central estimate of 0.42 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±100.5%, with 100% of held-out values landing inside the 95% band.

+137%Change by 2028
0.42Projected 2028 index
0.00–1.395% range
±100.5%Backtest error
19682028
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
20240.450.001.3
20250.440.001.3
20260.430.001.3
20270.420.001.3
20280.420.001.3

Routes In Sierra Nevada

Routes recording White-crowned Sparrow in Sierra Nevada.
Last ChanceCALIFORNIA62019
DardanelleCALIFORNIA42019
Cottage SpgsCALIFORNIA31968
JohnsvilleCALIFORNIA32019
ChesterCALIFORNIA22017
Lassen ParkCALIFORNIA11981
WestvilleCALIFORNIA12022
WoodfordsCALIFORNIA12023
Silver CityCALIFORNIA11977
Kings CanyonCALIFORNIA11972
SattleyCALIFORNIA11991
GeneseeCALIFORNIA11979
RivertonCALIFORNIA12010
LakeshoreCALIFORNIA12004
Little TruckeeCALIFORNIA12023
Pine MountainCALIFORNIA12017
ChilcootCALIFORNIA12023

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