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

White-throated Swift Population Trend in Idaho

All statesAerial insectivores

White-throated Swift in Idaho has held roughly steady: up 2% on the route-weighted index since 1990.

+2%Since 1990TrendPercent 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 →
9Routes 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 →
30YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable White-throated Swift 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 →

No notable trend signals for White-throated Swift in Idaho. See the full index history below.

White-throated Swift Population Forecast in Idaho

If the recent trend holds, White-throated Swift in Idaho is projected to stay roughly flat through 2029, near 0.16 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.

+1%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 →
0.16Projected 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 →
0.00–0.3695% 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 →
±22.5%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, White-throated Swift in Idaho is projected to stay roughly flat through 2029, near 0.16 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.19882029
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 →
20250.160.000.36
20260.160.000.36
20270.160.000.36
20280.160.000.36
20290.160.000.36

White-throated Swift Survey Routes in Idaho

Routes recording White-throated Swift 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 →
Almo620211988
Mora420222019
Magic Mtn420241988
Leadore320102010
Hot Spring119951995
Salmon River120021988
Sunbeam120072007
Featherville119921992
Dougal Res119921989

White-throated Swift Population Trend in Other States

arizonacaliforniacoloradomontananebraskanevadanew-mexicooregonsouth-dakotatexasutahwashingtonwyoming

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