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Species · California · BBS 2025 Release · 1966–2024

Bewick's Wren Population Trend in California

All statesForest birds

Bewick's Wren in California has edged up: up 14% on the route-weighted index since 1970.

+14%Since 1970
222Routes In State
56Years

Notable Bewick's Wren Trends in California

No notable trend signals for Bewick's Wren in California. See the full index history below.

Bewick's Wren Population Forecast in California

If the recent trend holds, Bewick's Wren in California is projected to fall about 19% by 2029 — from 5.8 in 2024 to a central estimate of 4.7 (95% range 3.0–6.4). A 5-year backtest shows a typical error of ±19.8%, with 100% of held-out values landing inside the 95% band.

-19%Change by 2029
4.7Projected 2029 index
3.0–6.495% range
±19.8%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
20254.73.06.4
20264.73.06.4
20274.73.06.4
20284.73.06.4
20294.73.06.4

Bewick's Wren Survey Routes in California

Routes recording Bewick's Wren in California.
Santa Cruz I7719881988
Elsinore Mtn6620241970
Poway5919801973
Cuyamaca Pk5720241970
Oak Grove4520241968
Iron Gate4420191988
S Catalina4320221988
Jacumba3620241973
South Lake3520062006
Auburn3319801969
Stonyford2820182015
Tres Pinos 22720112005
Anza 22420242005
Mt Baldy2120241970
Hough Springs2120071999
Tres Pinos1920031968
Lake Berryessa1920242023
Colma1819721968
Coyote1820241972
Waterman Gap1820241973
Rumsey1620081969
Silver City1520131972
Lake Cachuma1520161972
Tomhead1520111998
Lockwood Val1420191970

Bewick's Wren Population Trend in Other States

alabamaarizonaarkansascoloradoidahoillinoisindianaiowakansaskentuckymarylandmississippimissourinevadanew-mexiconorth-carolinaohiooklahomaoregonpennsylvaniatennesseetexasutahvirginiawashingtonwest-virginiawisconsinwyoming

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