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

Anna's Hummingbird In Sierra Nevada

All regionsSierra NevadaGeneralists

Anna's Hummingbird in Sierra Nevada has increased: up 30% on the route-weighted index since 1973.

+30%Since 1973TrendPercent 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 →
32Routes 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 →
53YearsYears 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 Anna's Hummingbird in Sierra Nevada. See the full index history below.

Anna's Hummingbird In Sierra Nevada Population Forecast

If the recent trend holds, Anna's Hummingbird in Sierra Nevada is projected to stay roughly flat through 2029, near 1.0 (95% range 0.35–1.7). A 5-year backtest shows a typical error of ±69.5%, with 100% of held-out values landing inside the 95% band.

+10%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 →
1.0Projected 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 →
0.35–1.795% 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 →
±69.5%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, Anna's Hummingbird in Sierra Nevada is projected to stay roughly flat through 2029, near 1.0 (95% range 0.35–1.7). A 5-year backtest shows a typical error of ±69.5%, with 100% of held-out values landing inside the 95% band.19712029
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 →
20250.990.311.7
20261.00.321.7
20271.00.331.7
20281.00.341.7
20291.00.351.7

Routes In Sierra Nevada

Routes recording Anna's 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 LakeCALIFORNIA62019
WestvilleCALIFORNIA52022
LakeshoreCALIFORNIA52024
KernvilleCALIFORNIA52008
Silver CityCALIFORNIA42013
Cottage SpgsCALIFORNIA31975
Higgins CornCALIFORNIA32024
CoultervilleCALIFORNIA32019
Kings CanyonCALIFORNIA22024
SattleyCALIFORNIA22013
RivertonCALIFORNIA22019
Chaos CraterCALIFORNIA21996
PaxtonCALIFORNIA22019
Pollock PinesCALIFORNIA22024
WawonaCALIFORNIA22024
Lassen ParkCALIFORNIA11986
Eagle LakeCALIFORNIA12024
JohnsvilleCALIFORNIA12009
WoodfordsCALIFORNIA12024
LumberyardCALIFORNIA11976
Greenhorn MtCALIFORNIA11997
Tuolumne GroveCALIFORNIA12023
Butte MeadowCALIFORNIA12013
GeneseeCALIFORNIA12023
DownievilleCALIFORNIA12023

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