BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Bewick's Wren In Coastal California

All regionsCoastal CaliforniaForest birds

Bewick's Wren in Coastal California has increased: up 25% on the route-weighted index since 1970.

+25%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
114Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

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

Bewick's Wren In Coastal California Population Forecast

If the recent trend holds, Bewick's Wren in Coastal California is projected to stay roughly flat through 2029, near 9.2 (95% range 5.9–13). A 5-year backtest shows a typical error of ±29.3%, with 80% of held-out values landing inside the 95% band.

-8%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
9.2Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.9–1395% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±29.3%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Bewick's Wren in Coastal California is projected to stay roughly flat through 2029, near 9.2 (95% range 5.9–13). A 5-year backtest shows a typical error of ±29.3%, with 80% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20259.15.712
20269.15.813
20279.25.813
20289.25.813
20299.25.913

Routes In Coastal California

Routes recording Bewick's Wren in Coastal California.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Santa Cruz ICALIFORNIA771988
Elsinore MtnCALIFORNIA662024
PowayCALIFORNIA591980
Cuyamaca PkCALIFORNIA572024
Oak GroveCALIFORNIA452024
S CatalinaCALIFORNIA432022
JacumbaCALIFORNIA362024
South LakeCALIFORNIA352006
AuburnCALIFORNIA331980
StonyfordCALIFORNIA282018
Tres Pinos 2CALIFORNIA272011
Anza 2CALIFORNIA242024
Mt BaldyCALIFORNIA212024
Hough SpringsCALIFORNIA212007
Tres PinosCALIFORNIA192003
Lake BerryessaCALIFORNIA192024
ColmaCALIFORNIA181972
CoyoteCALIFORNIA182024
Waterman GapCALIFORNIA182024
RumseyCALIFORNIA162008
Lake CachumaCALIFORNIA152016
TomheadCALIFORNIA152011
Lockwood ValCALIFORNIA142019
Elizabeth LkCALIFORNIA132016
Yolla BollyCALIFORNIA132024

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