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

Hutton's Vireo In Coastal California

All regionsCoastal CaliforniaForest birds

Hutton's Vireo in Coastal California has edged down: down 11% on the route-weighted index since 1970.

-11%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 →
79Routes 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 Hutton's Vireo in Coastal California. See the full index history below.

Hutton's Vireo In Coastal California Population Forecast

If the recent trend holds, Hutton's Vireo in Coastal California is projected to rise about 147% by 2029 — from 0.72 in 2024 to a central estimate of 1.8 (95% range 0.69–2.9). A 5-year backtest shows a typical error of ±205.3%, with 0% of held-out values landing inside the 95% band.

+147%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 →
1.8Projected 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 →
0.69–2.995% 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 →
±205.3%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, Hutton's Vireo in Coastal California is projected to rise about 147% by 2029 — from 0.72 in 2024 to a central estimate of 1.8 (95% range 0.69–2.9). A 5-year backtest shows a typical error of ±205.3%, with 0% 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 →
20251.70.632.8
20261.70.642.8
20271.80.662.9
20281.80.672.9
20291.80.692.9

Routes In Coastal California

Routes recording Hutton's Vireo 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 →
AdelaidaCALIFORNIA152015
Santa Cruz ICALIFORNIA71988
ColmaCALIFORNIA51972
Elsinore MtnCALIFORNIA52024
TehamaCALIFORNIA52022
CalpellaCALIFORNIA41986
RumseyCALIFORNIA42008
Waterman GapCALIFORNIA42024
Tres Pinos 2CALIFORNIA42011
Yokohl ValCALIFORNIA31997
CoalingaCALIFORNIA32007
Point ReyesCALIFORNIA32023
FairfaxCALIFORNIA32024
Carmel ValCALIFORNIA32024
Lake CachumaCALIFORNIA32016
Gold HillCALIFORNIA32024
Angelus OaksCALIFORNIA32005
Tres PinosCALIFORNIA22003
Harbor LakeCALIFORNIA21976
Lake SuccessCALIFORNIA21973
Morro BayCALIFORNIA22013
AuburnCALIFORNIA21980
CohassetCALIFORNIA22023
FolsomCALIFORNIA22024
S CatalinaCALIFORNIA22019

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