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

Northern Rough-winged Swallow Population Trend in Idaho

All statesAerial insectivores

Northern Rough-winged Swallow in Idaho has edged down: down 16% on the route-weighted index since 1970.

-16%Since 1970
55Routes In State
56Years

Notable Northern Rough-winged Swallow Trends in Idaho

No notable trend signals for Northern Rough-winged Swallow in Idaho. See the full index history below.

Northern Rough-winged Swallow Population Forecast in Idaho

If the recent trend holds, Northern Rough-winged Swallow in Idaho is projected to fall about 19% by 2029 — from 5.4 in 2024 to a central estimate of 4.3 (95% range 0.00–9.0). A 5-year backtest shows a typical error of ±25%, with 100% of held-out values landing inside the 95% band.

-19%Change by 2029
4.3Projected 2029 index
0.00–9.095% range
±25%Backtest error
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 index95% low95% high
20254.30.009.0
20264.30.009.0
20274.30.009.0
20284.30.009.0
20294.30.009.0

Northern Rough-winged Swallow Survey Routes in Idaho

Routes recording Northern Rough-winged Swallow in Idaho.
Naples7320241972
Glenns Ferry3219861968
Golden2620161987
Baker2420241974
Cedar Hill2020241989
Triangle1220211985
Pocatello720191979
Pasadena Val720161987
Leadore620241974
Magic Mtn620211987
Henry619791973
Daniels Res620191988
Nezperce Nf619991992
Lost River520222005
Cape Horn519921992
Challis520191976
Coolin520241986
Tractor Flat520082006
Burgdorf520031990
Crane Creek520191989
Featherville520221989
Nezperce420121968
Dubois420241969
Almo420221988
Lolo Pass320191996

Northern Rough-winged Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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