BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Broad-tailed Hummingbird Population Trend in Colorado

All statesGeneralists

Broad-tailed Hummingbird in Colorado has held roughly steady: down 5% on the route-weighted index since 1970.

-5%Since 1970TrendPercent 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 →
107Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Broad-tailed Hummingbird Trends in ColoradoNotable 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 Broad-tailed Hummingbird in Colorado. See the full index history below.

Broad-tailed Hummingbird Population Forecast in Colorado

If the recent trend holds, Broad-tailed Hummingbird in Colorado is projected to rise about 25% by 2029 — from 5.2 in 2024 to a central estimate of 6.6 (95% range 4.2–8.9). A 5-year backtest shows a typical error of ±35.7%, with 80% of held-out values landing inside the 95% band.

+25%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 →
6.6Projected 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 →
4.2–8.995% 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 →
±35.7%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, Broad-tailed Hummingbird in Colorado is projected to rise about 25% by 2029 — from 5.2 in 2024 to a central estimate of 6.6 (95% range 4.2–8.9). A 5-year backtest shows a typical error of ±35.7%, 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 →
20256.44.18.8
20266.54.18.8
20276.54.18.8
20286.54.28.9
20296.64.28.9

Broad-tailed Hummingbird Survey Routes in Colorado

Routes recording Broad-tailed Hummingbird in Colorado.
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 →
Stillwater Pass4420091998
Tincup3620241992
Gold Hill3520121998
Ragged Mtn.3120191994
Aspen2920241979
Deadman Rd.2820241992
Trail Ridge Road2820142003
Steamboat L.2620241996
Comanche Pk2620241994
Fox Creek2520241993
Gold Hill 22420242018
Castleton2220241988
Heeney2220192017
Cheesman Lk2120241969
Wet Mtns.2120241993
Lost Lake1920241990
Blackhead Pk1920211991
Parlin1520231968
Dolores Riv1520241988
Rollins Pass1520221998
Dunckley Pas1420241992
Stillwater Pass 21420242010
Guanella Pas1320241992
Moon Pass1320241998
Red Cliff1220241989

Broad-tailed Hummingbird Population Trend in Other States

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