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

Northern Rough-winged Swallow Population Trend in Washington

All statesAerial insectivores

Northern Rough-winged Swallow in Washington has held roughly steady: down 9% on the route-weighted index since 1970.

-9%Since 1970
103Routes In State
56Years

Notable Northern Rough-winged Swallow Trends in Washington

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

Northern Rough-winged Swallow Population Forecast in Washington

If the recent trend holds, Northern Rough-winged Swallow in Washington is projected to fall about 22% by 2029 — from 3.4 in 2024 to a central estimate of 2.6 (95% range 0.33–4.9). A 5-year backtest shows a typical error of ±48%, with 100% of held-out values landing inside the 95% band.

-22%Change by 2029
2.6Projected 2029 index
0.33–4.995% range
±48%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
20252.60.364.9
20262.60.354.9
20272.60.344.9
20282.60.344.9
20292.60.334.9

Northern Rough-winged Swallow Survey Routes in Washington

Routes recording Northern Rough-winged Swallow in Washington.
Malden6220241999
Ewan 25220242023
Harwood4719971993
Walla Walla3019931993
Hartline2820061994
Laurier2220222004
Hanford Site2019961991
Selah1920142000
Mesa1820081994
Pomona1819991999
Yakima1420231993
Pomeroy1220242005
Horn Rapids1220152005
Twisp1120241969
Ewan1120191985
Cougar820231969
Potholes820231996
Prescott720191981
Lake Chelan720241988
Ozette620241971
Wilbur620171985
Nighthawk620241992
Newhalem520241968
South Elma520241984
Port Angeles420241973

Northern Rough-winged Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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