BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Varied Thrush In Northern Rockies

All regionsNorthern RockiesForest birds

Varied Thrush in Northern Rockies has edged down: down 16% on the route-weighted index since 1970.

-16%Since 1970
69Routes In Region
56Years

Notable Signals

No notable trend signals for Varied Thrush in Northern Rockies. See the full index history below.

Forecast

If the recent trend holds, Varied Thrush in Northern Rockies is projected to rise about 197% by 2029 — from 0.42 in 2024 to a central estimate of 1.2 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±125.4%, with 100% of held-out values landing inside the 95% band.

+197%Change by 2029
1.2Projected 2029 index
0.00–2.595% range
±125.4%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
20251.20.002.5
20261.20.002.5
20271.20.002.5
20281.20.002.5
20291.20.002.5

Routes In Northern Rockies

Routes recording Varied Thrush in Northern Rockies.
Lolo PassIDAHO322019
SkalkahoMONTANA191998
Logan PassMONTANA172024
Baldy MountainIDAHO162016
AveryIDAHO152023
Marble CreekIDAHO142023
Sullivan Lake 2WASHINGTON142024
Whitefish LakeMONTANA112024
PierceIDAHO102007
NorthportWASHINGTON92007
MivodenIDAHO72023
GrangevilleIDAHO72024
N Fork Cda RIDAHO62019
CascadeIDAHO41983
AlturasIDAHO41968
Rochat DivdeIDAHO42023
Sullivan LkWASHINGTON41999
CoolinIDAHO32024
St RegisMONTANA32023
Skalkho-RyeMONTANA32015
L Pend O NwrWASHINGTON32022
NaplesIDAHO22022
NezperceIDAHO22012
GoldenIDAHO22016
Nezperce NfIDAHO21999

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