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Species · Washington · BBS 2025 Release · 1966–2024

Hermit Thrush Population Trend in Washington

All statesForest birds

Hermit Thrush in Washington has surged: up 122% on the route-weighted index since 1970.

+122%Since 1970
51Routes In State
56Years

Notable Hermit Thrush Trends in Washington

long arc increasecomputed index

Hermit Thrush has surged in Washington: up 122% on the route-weighted index since 1970.

Hermit Thrush Population Forecast in Washington

If the recent trend holds, Hermit Thrush in Washington is projected to stay roughly flat through 2029, near 5.0 (95% range 3.5–6.5). A 5-year backtest shows a typical error of ±26.3%, with 80% of held-out values landing inside the 95% band.

+2%Change by 2029
5.0Projected 2029 index
3.5–6.595% range
±26.3%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
20254.73.26.2
20264.83.36.3
20274.93.46.3
20284.93.56.4
20295.03.56.5

Hermit Thrush Survey Routes in Washington

Routes recording Hermit Thrush in Washington.
Blewett Pass6920241992
Mt. Adams4020241993
Cloverland3220241996
E. Mt. Adams2720241995
Twin Lakes2319931986
Ronald2320241973
Glacier1420241975
Rimrock1320241968
Sullivan Lake 21120242000
Spring Lake1120241985
Mt Rainier1020211990
Laurier1020222005
Greenwater1020242015
No Cascades820191988
Hurricane Rg820241992
Mt St Helens820241992
Index819971997
Twisp720151985
Leavenworth720241984
Cusick420221988
Nighthawk420001992
Sullivan Lk419991999
L. Wenatchee420241993
Mendota319881978
Packwood320241976

Hermit Thrush Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahomainemarylandmassachusettsmichiganminnesotamontananevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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