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

Wilson's Warbler In Sierra Nevada

All regionsSierra NevadaForest birds

Wilson's Warbler in Sierra Nevada has fallen sharply: down 55% on the route-weighted index since 1970.

-55%Since 1970
33Routes In Region
55Years

Notable Signals

long arc declinecomputed index

Wilson's Warbler has fallen sharply in Sierra Nevada: down 55% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Wilson's Warbler in Sierra Nevada is projected to fall about 19% by 2029 — from 0.74 in 2024 to a central estimate of 0.60 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±35.8%, with 80% of held-out values landing inside the 95% band.

-19%Change by 2029
0.60Projected 2029 index
0.00–1.895% range
±35.8%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
20250.690.001.9
20260.660.001.9
20270.640.001.9
20280.620.001.9
20290.600.001.8

Routes In Sierra Nevada

Routes recording Wilson's Warbler in Sierra Nevada.
GeneseeCALIFORNIA102024
ChesterCALIFORNIA102017
Last ChanceCALIFORNIA72019
Greenhorn MtCALIFORNIA61982
DardanelleCALIFORNIA52019
Lassen ParkCALIFORNIA31977
WestvilleCALIFORNIA32021
Silver CityCALIFORNIA32005
Cottage SpgsCALIFORNIA21970
JohnsvilleCALIFORNIA22024
Kings CanyonCALIFORNIA21987
Butte MeadowCALIFORNIA22014
DownievilleCALIFORNIA22019
Meadow ValleyCALIFORNIA22023
Little TruckeeCALIFORNIA22023
CoultervilleCALIFORNIA22018
Eagle LakeCALIFORNIA12005
Bass LakeCALIFORNIA12019
WoodfordsCALIFORNIA12024
LumberyardCALIFORNIA12017
Tuolumne GroveCALIFORNIA12011
SattleyCALIFORNIA12016
Higgins CornCALIFORNIA12013
RivertonCALIFORNIA12023
Hat CreekCALIFORNIA12016

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