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Species · Washington · BBS 2025 Release · 1966–2024

Hermit Warbler Population Trend in Washington

All statesForest birds

Hermit Warbler in Washington has held roughly steady: up 1% on the route-weighted index since 1971.

+1%Since 1971
27Routes In State
51Years

Notable Hermit Warbler Trends in Washington

No notable trend signals for Hermit Warbler in Washington. See the full index history below.

Hermit Warbler Population Forecast in Washington

If the recent trend holds, Hermit Warbler in Washington is projected to fall about 20% by 2029 — from 1.5 in 2024 to a central estimate of 1.2 (95% range 0.35–2.1). A 5-year backtest shows a typical error of ±32.9%, with 100% of held-out values landing inside the 95% band.

-20%Change by 2029
1.2Projected 2029 index
0.35–2.195% range
±32.9%Backtest error
19692029
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
20251.20.302.0
20261.20.312.0
20271.20.332.0
20281.20.342.0
20291.20.352.1

Hermit Warbler Survey Routes in Washington

Routes recording Hermit Warbler in Washington.
Mt. Adams4720241993
E. Mt. Adams3120241995
Suiattle Riv1520192017
Cougar1220231969
Mt Rainier520151991
Raymond 2420242022
South Elma419751975
Kamilche320221984
Deception219981998
Mendota 2220001989
Bunker Hill220242016
Ronald219971978
Ilwaco219781975
Mt St Helens220242013
Pe Ell220221994
Montesand119901990
Taholah120092009
Mcchord120151996
Rimrock119761976
Snowden120221984
Mendota119831983
Packwood120151975
White Chuck119991999
Carlton119981997
Raymond119931993

Hermit Warbler Population Trend in Other States

californiaoregon

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