BirdAnalyst
Species · West Virginia · BBS 2025 Release · 1966–2024

Tree Swallow Population Trend in West Virginia

All statesAerial insectivores

Tree Swallow in West Virginia has surged: up 23× on the route-weighted index since 1977.

23×Since 1977
59Routes In State
47Years

Notable Tree Swallow Trends in West Virginia

long arc increasecomputed index

Tree Swallow has surged in West Virginia: up 23× on the route-weighted index since 1977.

Tree Swallow Population Forecast in West Virginia

If the recent trend holds, Tree Swallow in West Virginia is projected to rise about 72% by 2029 — from 2.3 in 2024 to a central estimate of 3.9 (95% range 2.6–5.3). A 5-year backtest shows a typical error of ±74.3%, with 40% of held-out values landing inside the 95% band.

+72%Change by 2029
3.9Projected 2029 index
2.6–5.395% range
±74.3%Backtest error
19742029
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
20253.62.25.0
20263.72.35.0
20273.82.45.1
20283.82.55.2
20293.92.65.3

Tree Swallow Survey Routes in West Virginia

Routes recording Tree Swallow in West Virginia.
Welch3520222002
Clear Creek2620241995
Ghent1320241990
Clendenin1320242003
Glade Run919991999
Lost River720232001
Hubbardstown620232003
Ruthbelle620241975
Pt Pleasant520222000
Spencer520232004
Yellow Spg520221984
Shanghai520221999
Stollings420072004
Bramwell420191981
Yawkey420242003
Washburn420152002
Paradise320231995
Olcott320241995
Slate320242011
Hix220241986
Smoot220191986
Meadland220182002
Nicut220241989
Fayetteville219961991
Sutton220221989

Tree Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwisconsinwyoming

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