BirdAnalyst
Species · BCR 32 · BBS 2026 Release · 1966–2025

Brown Creeper In Coastal California

All regionsCoastal CaliforniaForest birds

Brown Creeper in Coastal California has increased: up 45% on the route-weighted index since 1971.

+45%Since 1971TrendPercent 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 →
39Routes 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 Brown Creeper in Coastal California. See the full index history below.

Brown Creeper In Coastal California Population Forecast

If the recent trend holds, Brown Creeper in Coastal California is projected to rise about 23% by 2030 — from 0.79 in 2025 to a central estimate of 0.97 (95% range 0.32–1.6). A 5-year backtest shows a typical error of ±134.5%, with 60% of held-out values landing inside the 95% band.

+23%Change by 2030TrendPercent 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 →
0.97Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.32–1.695% 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 →
±134.5%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, Brown Creeper in Coastal California is projected to rise about 23% by 2030 — from 0.79 in 2025 to a central estimate of 0.97 (95% range 0.32–1.6). A 5-year backtest shows a typical error of ±134.5%, with 60% of held-out values landing inside the 95% band.19692030
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 →
20260.940.301.6
20270.950.301.6
20280.950.311.6
20290.960.321.6
20300.970.321.6

Routes In Coastal California

Routes recording Brown Creeper 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 →
Waterman GapCALIFORNIA132025
Point ReyesCALIFORNIA92025
FairfaxCALIFORNIA82024
Big BearCALIFORNIA41983
CohassetCALIFORNIA42022
Glen Ellen 2CALIFORNIA32015
PescaderoCALIFORNIA32025
StonyfordCALIFORNIA32018
RumseyCALIFORNIA21975
ColmaCALIFORNIA21971
Carmel ValCALIFORNIA22025
Cp. PendletonCALIFORNIA21980
Mt LagunaCALIFORNIA21971
White RiverCALIFORNIA21992
MoragaCALIFORNIA22025
Bartlett SpsCALIFORNIA22018
Lake Hemet 2CALIFORNIA21993
Hough SpringsCALIFORNIA22007
CalpellaCALIFORNIA11981
Tres PinosCALIFORNIA11987
Mt PinosCALIFORNIA12004
Oak GroveCALIFORNIA11978
Lake SuccessCALIFORNIA11977
Morro BayCALIFORNIA11985
Lake HemetCALIFORNIA11986

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.