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

Hermit Thrush In Sierra Nevada

All regionsSierra NevadaForest birds

Hermit Thrush in Sierra Nevada has fallen sharply: down 50% on the route-weighted index since 1972.

-50%Since 1972
36Routes In Region
54Years

Notable Signals

long arc declinecomputed index

Hermit Thrush has fallen sharply in Sierra Nevada: down 50% on the route-weighted index since 1972.

Forecast

If the recent trend holds, Hermit Thrush in Sierra Nevada is projected to rise about 167% by 2029 — from 1.0 in 2024 to a central estimate of 2.7 (95% range 0.65–4.7). A 5-year backtest shows a typical error of ±81%, with 80% of held-out values landing inside the 95% band.

+167%Change by 2029
2.7Projected 2029 index
0.65–4.795% range
±81%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
20252.80.754.8
20262.70.734.8
20272.70.704.7
20282.70.674.7
20292.70.654.7

Routes In Sierra Nevada

Routes recording Hermit Thrush in Sierra Nevada.
GoumazCALIFORNIA112011
Lassen ParkCALIFORNIA101989
JohnsvilleCALIFORNIA82024
Little TruckeeCALIFORNIA82023
Tahoe NfCALIFORNIA61994
LumberyardCALIFORNIA52024
ChesterCALIFORNIA52017
StrawberryCALIFORNIA52019
DardanelleCALIFORNIA42019
DownievilleCALIFORNIA32021
Forest HillCALIFORNIA32019
Pine MountainCALIFORNIA32017
Silver CityCALIFORNIA22013
Kings CanyonCALIFORNIA21988
Tuolumne GroveCALIFORNIA22023
Butte MeadowCALIFORNIA22014
Hat CreekCALIFORNIA22018
LakeshoreCALIFORNIA22011
Chaos CraterCALIFORNIA22019
Meadow ValleyCALIFORNIA22024
WawonaCALIFORNIA22022
ChilcootCALIFORNIA22024
Forest Hill 2CALIFORNIA22005
Eagle LakeCALIFORNIA12022
WestvilleCALIFORNIA12024

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