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Species · Alaska · BBS 2025 Release · 1966–2024

Townsend's Warbler Population Trend in Alaska

All statesForest birds

Townsend's Warbler in Alaska has surged: up 131% on the route-weighted index since 1982.

+131%Since 1982
72Routes In State
44Years

Notable Townsend's Warbler Trends in Alaska

long arc increasecomputed index

Townsend's Warbler has surged in Alaska: up 131% on the route-weighted index since 1982.

Townsend's Warbler Population Forecast in Alaska

If the recent trend holds, Townsend's Warbler in Alaska is projected to fall about 32% by 2029 — from 8.8 in 2024 to a central estimate of 6.0 (95% range 3.2–8.7). A 5-year backtest shows a typical error of ±21.6%, with 80% of held-out values landing inside the 95% band.

-32%Change by 2029
6.0Projected 2029 index
3.2–8.795% range
±21.6%Backtest error
19722029
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
20255.83.18.5
20265.83.18.6
20275.93.28.6
20285.93.28.7
20296.03.28.7

Townsend's Warbler Survey Routes in Alaska

Routes recording Townsend's Warbler in Alaska.
Thorne Bay 29420242013
Whale Pass8120241997
Craig7920241983
Chena Hot Spring 25920241999
Thorne Bay5520121989
Ketchikan5120221972
Chichagof Is5120241994
Kuiu Island4620102004
Mitkof Isle3820241988
Haines3720241991
Moose Pass3719921983
Seward3519921982
Hoonah3020241993
Zimovia Strt2920241990
Homer2519821982
Sitka2520241993
Kenai Lake (Short)1719921984
Petersburg1619871987
Zarembo1520241998
Hope1520241985
Hyder1320091994
Juneau1020241983
Sitka (Short)819921984
Juneau Alt619861984
Beaver Creek519771977

Townsend's Warbler Population Trend in Other States

idahomontanaoregonwashingtonwyoming

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