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

Mountain Bluebird In Coastal California

All regionsCoastal CaliforniaForest birds

Mountain Bluebird in Coastal California has collapsed: down 86% on the route-weighted index since 1971.

-86%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 →
8Routes 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 →
15YearsYears 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 declinecomputed 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 →

Mountain Bluebird has collapsed in Coastal California: down 86% on the route-weighted index since 1971.

Routes In Coastal California

Routes recording Mountain Bluebird 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 →
OnealsCALIFORNIA22015
AlamarCALIFORNIA21997
Yokohl ValCALIFORNIA11973
Big BearCALIFORNIA11980
Sawmill MtnCALIFORNIA11971
Green ValleyCALIFORNIA11998
VentucopaCALIFORNIA11997
JacumbaCALIFORNIA11976

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