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

Cliff Swallow Population Trend in Washington

All statesAerial insectivores

Cliff Swallow in Washington has declined: down 28% on the route-weighted index since 1970.

-28%Since 1970
96Routes In State
56Years

Notable Cliff Swallow Trends in Washington

No notable trend signals for Cliff Swallow in Washington. See the full index history below.

Cliff Swallow Population Forecast in Washington

If the recent trend holds, Cliff Swallow in Washington is projected to rise about 113% by 2029 — from 14 in 2024 to a central estimate of 31 (95% range 4.4–57). A 5-year backtest shows a typical error of ±69.3%, with 100% of held-out values landing inside the 95% band.

+113%Change by 2029
31Projected 2029 index
4.4–5795% range
±69.3%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
2025314.457
2026314.457
2027314.457
2028314.457
2029314.457

Cliff Swallow Survey Routes in Washington

Routes recording Cliff Swallow in Washington.
Scootney Reservoir24520242009
Columbia Nwr19820221992
Mesa18520081994
Othello17219911981
Horn Rapids13820242005
Potholes12320231996
Nighthawk10720241992
Keystone6920241994
Wapato6620221972
Ewan5920191983
Brewster4920181977
Mendota4819881977
Hanford Site3719961988
Omak Creek3620241996
Pomona3419991998
Harrington3220121980
Yakima3120241993
Warm Beach 22920242018
Wilbur2820241985
Warm Beach2520171968
Selah2420232000
Mercer1620211978
Rainier1620181996
Rimrock1520241969
Laurier1520221997

Cliff Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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