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

Broad-tailed Hummingbird Population Trend in Idaho

All statesGeneralists

Broad-tailed Hummingbird in Idaho has surged: up 612% on the route-weighted index since 1985.

+612%Since 1985TrendPercent 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 →
12Routes 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 →
38YearsYears 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 IdahoNotable 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 increasecomputed 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 →

Broad-tailed Hummingbird has surged in Idaho: up 612% on the route-weighted index since 1985.

Broad-tailed Hummingbird Population Forecast in Idaho

If the recent trend holds, Broad-tailed Hummingbird in Idaho is projected to fall about 38% by 2029 — from 0.76 in 2024 to a central estimate of 0.47 (95% range 0.22–0.72). A 5-year backtest shows a typical error of ±44.7%, with 20% of held-out values landing inside the 95% band.

-38%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 →
0.47Projected 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 →
0.22–0.7295% 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 →
±44.7%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 Idaho is projected to fall about 38% by 2029 — from 0.76 in 2024 to a central estimate of 0.47 (95% range 0.22–0.72). A 5-year backtest shows a typical error of ±44.7%, with 20% of held-out values landing inside the 95% band.19732029
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 →
20250.430.180.68
20260.440.190.69
20270.450.200.70
20280.460.210.71
20290.470.220.72

Broad-tailed Hummingbird Survey Routes in Idaho

Routes recording Broad-tailed Hummingbird in Idaho.
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 →
Magic Mtn1820241989
Challis220222021
Almo120171988
Daniels Res120001988
Silver City120021993
Preston119881988
Cape Horn119901990
Squirrel120241998
Centerville119851974
Alturas119851985
Henry119731973
Bates120091996

Broad-tailed Hummingbird Population Trend in Other States

arizonacaliforniacoloradomontananevadanew-mexicosouth-dakotatexasutahwyoming

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