BirdAnalyst
Species · Idaho · BBS 2026 Release · 1966–2025

Cliff Swallow Population Trend in Idaho

All statesAerial insectivores

Cliff Swallow in Idaho has increased: up 42% on the route-weighted index since 1970.

+42%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 →
57YearsYears 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 stay roughly flat through 2030, near 17 (95% range 0.00–37). A 5-year backtest shows a typical error of ±53.6%, with 100% of held-out values landing inside the 95% band.

+1%Change by 2030TrendPercent 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 →
17Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–3795% 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 →
±53.6%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 stay roughly flat through 2030, near 17 (95% range 0.00–37). A 5-year backtest shows a typical error of ±53.6%, with 100% of held-out values landing inside the 95% band.19682030
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 →
2026180.0038
2027180.0037
2028170.0037
2029170.0037
2030170.0037

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
Ririe12320251971
Daniels Res11620251988
Sawtooth City 211120252015
Mud Lake10320251989
Sawtooth Cty9620141988
Cascade6619841970
Crane Creek4820191993
Cape Horn4620251972
Blacks Creek3120171969
Preston2820231988
Glenns Ferry2419861968
Gifford2320171972
Almo2220251989
Mora2220252018
Sunbeam2020191994
Cedar Hill2020241989
Squirrel1820251971
Avery1719941989
Bates1720231988
Pocatello1420191981
Dougal Res1420241988
Springfield1320181969
Magic Mtn1220181990

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 2026-08-14.