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Species · California · BBS 2025 Release · 1966–2024

Calliope Hummingbird Population Trend in California

All statesGeneralists

Calliope Hummingbird in California has declined: down 43% on the route-weighted index since 1971.

-43%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 →
51Routes 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 →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Calliope Hummingbird 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 Calliope Hummingbird in California. See the full index history below.

Calliope Hummingbird Population Forecast in California

If the recent trend holds, Calliope Hummingbird in California is projected to stay roughly flat through 2029, near 0.11 (95% range 0.01–0.20). A 5-year backtest shows a typical error of ±147.8%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.11Projected 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 →
0.01–0.2095% 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 →
±147.8%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, Calliope Hummingbird in California is projected to stay roughly flat through 2029, near 0.11 (95% range 0.01–0.20). A 5-year backtest shows a typical error of ±147.8%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.100.010.20
20260.100.010.20
20270.100.010.20
20280.100.010.20
20290.110.010.20

Calliope Hummingbird Survey Routes in California

Routes recording Calliope Hummingbird 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 →
Big Bear719811969
Gazelle420041988
Dirigio320071999
Little Truckee320231997
Chilcoot320241998
Kings Canyon220102010
Dardanelle220061972
Goumaz220111997
Medicine Mtn.220122006
Butte Meadow219891976
Last Chance220181993
Yreka219861986
Horse Creek119811981
Green Valley120231972
Nubieber120021997
Iron Gate120182018
Eagle Lake120151983
Westville120192013
Whiskeytown120072002
Hackamore120062002
Tionesta120182001
Crowder Flat120052002
Gold Hill119851985
Crowley Lake120042004
French Gulch120072002

Calliope Hummingbird Population Trend in Other States

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