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

Wrentit In Coastal California

All regionsCoastal CaliforniaGeneralists

Wrentit in Coastal California has edged up: up 22% on the route-weighted index since 1970.

+22%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 →
86Routes 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 Wrentit in Coastal California. See the full index history below.

Forecast

If the recent trend holds, Wrentit in Coastal California is projected to stay roughly flat through 2029, near 11 (95% range 6.9–15). A 5-year backtest shows a typical error of ±30.3%, with 80% of held-out values landing inside the 95% band.

-1%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 →
11Projected 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 →
6.9–1595% 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 →
±30.3%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, Wrentit in Coastal California is projected to stay roughly flat through 2029, near 11 (95% range 6.9–15). A 5-year backtest shows a typical error of ±30.3%, 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 →
2025116.815
2026116.815
2027116.915
2028116.915
2029116.915

Routes In Coastal California

Routes recording Wrentit 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 →
Elsinore MtnCALIFORNIA1242024
RumseyCALIFORNIA792008
Lake CachumaCALIFORNIA762016
Mt BaldyCALIFORNIA742024
Hough SpringsCALIFORNIA632007
Cuyamaca PkCALIFORNIA612024
San Benito Mtn.CALIFORNIA582009
StonyfordCALIFORNIA442018
PowayCALIFORNIA401980
Jofegan 2CALIFORNIA402024
TujungaCALIFORNIA352021
TomheadCALIFORNIA322011
FolsomCALIFORNIA312024
GreenfieldCALIFORNIA312024
Bartlett SpsCALIFORNIA292018
Foster ParkCALIFORNIA271994
Lake BerryessaCALIFORNIA262024
AlamarCALIFORNIA242017
JofeganCALIFORNIA212023
Morro BayCALIFORNIA182019
FairfaxCALIFORNIA182024
Mt LagunaCALIFORNIA181987
JacksonCALIFORNIA181992
ColmaCALIFORNIA171972
Oak GroveCALIFORNIA172024

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