BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Black-chinned Hummingbird In Sierra Nevada

All regionsSierra NevadaGeneralists

Black-chinned Hummingbird in Sierra Nevada has fallen sharply: down 52% on the route-weighted index since 1975.

-52%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 →
6Routes 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 →
17YearsYears 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 →

Black-chinned Hummingbird has fallen sharply in Sierra Nevada: down 52% on the route-weighted index since 1975.

Routes In Sierra Nevada

Routes recording Black-chinned Hummingbird in Sierra Nevada.
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 →
Bass LakeCALIFORNIA12017
Greenhorn MtCALIFORNIA11974
Silver CityCALIFORNIA12005
Kings CanyonCALIFORNIA11995
LakeshoreCALIFORNIA11981
KernvilleCALIFORNIA12008

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