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

Tree Swallow Population Trend in Utah

All statesAerial insectivores

Tree Swallow in Utah has collapsed: down 82% on the route-weighted index since 1970.

-82%Since 1970
66Routes In State
55Years

Notable Tree Swallow Trends in Utah

long arc declinecomputed index

Tree Swallow has collapsed in Utah: down 82% on the route-weighted index since 1970.

Tree Swallow Population Forecast in Utah

If the recent trend holds, Tree Swallow in Utah is projected to fall about 97% by 2029 — from 1.5 in 2024 to a central estimate of 0.05 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±81.6%, with 100% of held-out values landing inside the 95% band.

-97%Change by 2029
0.05Projected 2029 index
0.00–3.595% range
±81.6%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
20250.280.003.7
20260.220.003.6
20270.160.003.6
20280.100.003.5
20290.050.003.5

Tree Swallow Survey Routes in Utah

Routes recording Tree Swallow in Utah.
Grizzly Rdge2420241986
Monticello1920241999
Hanna1720241997
Beck1519871968
La Sal1419981994
Logan Canyon1020191997
Soapstone920221992
Uintah Nf919941987
Oak City820161980
Hardware Ranch820161994
Lost Cr. Res720181995
Boulder720021992
Richfield720181996
Altonah620151971
Woodruff620242002
Book Ridge520212021
M Warner Res520241993
Wellington 2520072007
Ferron520222002
Shivwitz420242000
Vernal420182004
Alton420062000
Escalante420051999
Wasatch Nf420241988
Hyrum319791975

Tree Swallow Population Trend in Other States

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

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