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

Tree Swallow Population Trend in Washington

All statesAerial insectivores

Tree Swallow in Washington has held roughly steady: down 7% on the route-weighted index since 1970.

-7%Since 1970
93Routes In State
56Years

Notable Tree Swallow Trends in Washington

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

Tree Swallow Population Forecast in Washington

If the recent trend holds, Tree Swallow in Washington is projected to rise about 30% by 2029 — from 3.8 in 2024 to a central estimate of 4.9 (95% range 2.7–7.2). A 5-year backtest shows a typical error of ±69%, with 60% of held-out values landing inside the 95% band.

+30%Change by 2029
4.9Projected 2029 index
2.7–7.295% range
±69%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
20254.92.77.1
20264.92.77.1
20274.92.77.1
20284.92.77.1
20294.92.77.2

Tree Swallow Survey Routes in Washington

Routes recording Tree Swallow in Washington.
Twisp3020241969
Camas2820091971
Cougar2620231968
Harrington2520121972
Nighthawk2320241992
Ilwaco1720241977
Rainier1620191995
Wapato1320191978
Laurier1320221996
Deception1220181992
Wilbur1020242001
Northport1020241996
Leavenworth920241981
Bay View820171993
L. Wenatchee820241994
Mcchord820151996
Warm Beach720171968
Brewster720141978
Rimrock720241968
Kendall720241981
Hurricane Rg720092001
Mendota 3720242005
Turnbull Nwr720231993
Snowden620241972
Everett620241975

Tree 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.