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Species · Montana · BBS 2025 Release · 1966–2024

Calliope Hummingbird Population Trend in Montana

All statesGeneralists

Calliope Hummingbird in Montana has increased: up 26% on the route-weighted index since 1973.

+26%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 →
29Routes 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 →
51YearsYears 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 MontanaNotable 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 Montana. See the full index history below.

Calliope Hummingbird Population Forecast in Montana

If the recent trend holds, Calliope Hummingbird in Montana is projected to rise about 79% by 2029 — from 0.09 in 2024 to a central estimate of 0.17 (95% range 0.03–0.31). A 5-year backtest shows a typical error of ±159.3%, with 80% of held-out values landing inside the 95% band.

+79%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 →
0.17Projected 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 →
0.03–0.3195% 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 →
±159.3%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, Calliope Hummingbird in Montana is projected to rise about 79% by 2029 — from 0.09 in 2024 to a central estimate of 0.17 (95% range 0.03–0.31). A 5-year backtest shows a typical error of ±159.3%, with 80% 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 →
20250.160.020.30
20260.160.020.30
20270.170.020.31
20280.170.020.31
20290.170.030.31

Calliope Hummingbird Survey Routes in Montana

Routes recording Calliope Hummingbird in Montana.
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 →
Red Rock420232008
Kalispell220242002
Clinton220241980
Elliston220231974
Inside Road220191998
Fish Creek220242000
Noxon220232003
Libby Dam119921985
Logan Pass119901988
Victor120001995
Threemile Wa120142006
Cramer Creek120191997
Elevation Mt120162003
Pryor Mtn.120162005
St Regis120191977
Polson120221987
Arlee120191968
Woodman120141973
Sula120192018
Chestnut120231968
Laurel119841984
East Glacier Park120242024
Skalkho-Rye120182000
Swan Lake120242016
Thompson Riv120171993

Calliope Hummingbird Population Trend in Other States

californiaidahonevadaoregonutahwashingtonwyoming

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