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

Northern Rough-winged Swallow Population Trend in Iowa

All statesAerial insectivores

Northern Rough-winged Swallow in Iowa has held roughly steady: up 2% on the route-weighted index since 1969.

+2%Since 1969
38Routes In State
57Years

Notable Northern Rough-winged Swallow Trends in Iowa

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

Northern Rough-winged Swallow Population Forecast in Iowa

If the recent trend holds, Northern Rough-winged Swallow in Iowa is projected to rise about 557% by 2029 — from 0.32 in 2024 to a central estimate of 2.1 (95% range 0.00–4.3). A 5-year backtest shows a typical error of ±376.8%, with 80% of held-out values landing inside the 95% band.

+557%Change by 2029
2.1Projected 2029 index
0.00–4.395% range
±376.8%Backtest error
19672029
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
20252.10.004.3
20262.10.004.3
20272.10.004.3
20282.10.004.3
20292.10.004.3

Northern Rough-winged Swallow Survey Routes in Iowa

Routes recording Northern Rough-winged Swallow in Iowa.
Bryant4220131967
West Liberty2220231974
Davis Corner1220031974
Alice819991968
Lafayette820232003
Mt Hamill720241967
Washington720211973
Hudson720131968
Maquoketa520231968
Zearing519951968
Cedar Valley419971971
Wales420171970
Dinsdale420131968
Kanawha419921989
Williamsburg320221974
Pierson320191968
Washta320141968
Mccallsburg320231996
Exline220171978
Bedford220151972
Desmoines219741969
Clare220151978
Sioux City220171969
Rock Valley220191969
Melrose120221975

Northern Rough-winged Swallow Population Trend in Other States

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

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