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

White-breasted Nuthatch In Coastal California

All regionsCoastal CaliforniaForest birds

White-breasted Nuthatch in Coastal California has surged: up 93% on the route-weighted index since 1970.

+93%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 →
89Routes 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

White-breasted Nuthatch has surged in Coastal California: up 93% on the route-weighted index since 1970.

Forecast

If the recent trend holds, White-breasted Nuthatch in Coastal California is projected to rise about 21% by 2029 — from 5.9 in 2024 to a central estimate of 7.1 (95% range 4.6–9.7). A 5-year backtest shows a typical error of ±35.8%, with 80% of held-out values landing inside the 95% band.

+21%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 →
7.1Projected 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 →
4.6–9.795% 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 →
±35.8%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, White-breasted Nuthatch in Coastal California is projected to rise about 21% by 2029 — from 5.9 in 2024 to a central estimate of 7.1 (95% range 4.6–9.7). A 5-year backtest shows a typical error of ±35.8%, 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 →
20256.94.39.4
20266.94.49.5
20277.04.49.6
20287.14.59.6
20297.14.69.7

Routes In Coastal California

Routes recording White-breasted Nuthatch 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 →
Gold HillCALIFORNIA302024
LockwoodCALIFORNIA242024
Yokohl ValCALIFORNIA231997
Tres Pinos 2CALIFORNIA232011
Yolla BollyCALIFORNIA222024
White RiverCALIFORNIA201992
Lake BerryessaCALIFORNIA192024
AdelaidaCALIFORNIA182024
TehamaCALIFORNIA182022
JacksonCALIFORNIA171992
CopperopolisCALIFORNIA162024
MoragaCALIFORNIA152024
CoyoteCALIFORNIA142024
FolsomCALIFORNIA132024
CrestonCALIFORNIA132024
Angelus OaksCALIFORNIA132017
Cal Hot SpgsCALIFORNIA122019
Tres PinosCALIFORNIA112003
Santa YnezCALIFORNIA112019
Orange CoveCALIFORNIA102016
Mt LagunaCALIFORNIA101987
RumseyCALIFORNIA92008
Mt PinosCALIFORNIA92004
Lake HemetCALIFORNIA91986
Carmel ValCALIFORNIA92024

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