BirdAnalyst
Species · California · BBS 2026 Release · 1966–2025

Juniper Titmouse Population Trend in California

All statesForest birds

Juniper Titmouse in California has held roughly steady: down 3% on the route-weighted index since 1975.

-3%Since 1975TrendPercent 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 →
19Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Juniper Titmouse Trends in CaliforniaNotable 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 Juniper Titmouse in California. See the full index history below.

Juniper Titmouse Population Forecast in California

If the recent trend holds, Juniper Titmouse in California is projected to fall about 27% by 2030 — from 0.06 in 2025 to a central estimate of 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±263.7%, with 100% of held-out values landing inside the 95% band.

-27%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 →
0.04Projected 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 →
0.00–0.1195% 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 →
±263.7%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, Juniper Titmouse in California is projected to fall about 27% by 2030 — from 0.06 in 2025 to a central estimate of 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±263.7%, with 100% 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 →
20260.040.000.11
20270.040.000.11
20280.040.000.11
20290.040.000.11
20300.040.000.11

Juniper Titmouse Survey Routes in California

Routes recording Juniper Titmouse in 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 →
Nubieber420042003
Eagle Lake419751975
Big Pine320101969
Likely320251982
Crowder Flat220072003
Sattley220051984
Clear Lk Res220071993
Woodfords220142007
Madeline120251997
Crowley Lake119941994
Davis Creek120101993
Dorris119901986
Ivanpah120192019
Deep Springs120221975
Ingalls120251976
Ravendale120081983
Benton120142003
Bodie120242009
Lone Pine119701970

Juniper Titmouse Population Trend in Other States

arizonacoloradoidahonevadanew-mexicooregonutahwyoming

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