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

Tree Swallow Population Trend in Oregon

All statesAerial insectivores

Tree Swallow in Oregon has declined: down 31% on the route-weighted index since 1970.

-31%Since 1970
115Routes In State
56Years

Notable Tree Swallow Trends in Oregon

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

Tree Swallow Population Forecast in Oregon

If the recent trend holds, Tree Swallow in Oregon is projected to stay roughly flat through 2029, near 3.5 (95% range 1.6–5.3). A 5-year backtest shows a typical error of ±22.3%, with 100% of held-out values landing inside the 95% band.

+6%Change by 2029
3.5Projected 2029 index
1.6–5.395% range
±22.3%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
20253.51.65.3
20263.51.65.3
20273.51.65.3
20283.51.65.3
20293.51.65.3

Tree Swallow Survey Routes in Oregon

Routes recording Tree Swallow in Oregon.
Modoc Point 27920242024
Modoc Point5520181969
Molalla3920051994
Coquille3220241994
Deschutes2620241968
Derby2519931968
Ruch2120231992
Barnes Val1919871971
Emigrant Lk1720011972
Ordnance1419791974
Winberry1320211968
Wedderburn1320241970
Glasgow1320241988
Adair1120231971
Dayton1120241974
Mt Hood1120241972
Adrian1119931985
Svensen1019921990
Albee920241969
Mount Vernon920241987
Bridgeport820221987
Elkton820241973
Summit Pr820241980
Emigrant Lake 2820242002
Days Creek720241971

Tree Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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