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

Cliff Swallow Population Trend in Idaho

All statesAerial insectivores

Cliff Swallow in Idaho has increased: up 40% on the route-weighted index since 1970.

+40%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 →
59Routes 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 Cliff Swallow 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 Cliff Swallow in Idaho. See the full index history below.

Cliff Swallow Population Forecast in Idaho

If the recent trend holds, Cliff Swallow in Idaho is projected to rise about 106% by 2029 — from 8.5 in 2024 to a central estimate of 18 (95% range 0.00–38). A 5-year backtest shows a typical error of ±43.1%, with 100% of held-out values landing inside the 95% band.

+106%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 →
18Projected 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 →
0.00–3895% 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 →
±43.1%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, Cliff Swallow in Idaho is projected to rise about 106% by 2029 — from 8.5 in 2024 to a central estimate of 18 (95% range 0.00–38). A 5-year backtest shows a typical error of ±43.1%, with 100% 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 →
2025180.0038
2026180.0038
2027180.0038
2028180.0038
2029180.0038

Cliff Swallow Survey Routes in Idaho

Routes recording Cliff Swallow 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 →
Henry20419831973
Alturas12719871969
Sawtooth Cty9620141988
Cascade6619841970
Sawtooth City 26420242015
Naples5020221972
Crane Creek4820191993
Mora4720242018
Daniels Res4120191988
Cape Horn3620241972
Blacks Creek3120171969
Cabarton3020231985
Preston2820231988
Glenns Ferry2419861968
Gifford2320171972
Sunbeam2020191994
Hot Spring2020141988
Cedar Hill2020241989
Avery1719941989
Bates1720231988
Centerville1620191972
Ririe1520231971
Pocatello1420191981
Dougal Res1420241988
Springfield1320181969

Cliff Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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