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

Tree Swallow Population Trend in Montana

All statesAerial insectivores

Tree Swallow in Montana has surged: up 112% on the route-weighted index since 1970.

+112%Since 1970
100Routes In State
56Years

Notable Tree Swallow Trends in Montana

long arc increasecomputed index

Tree Swallow has surged in Montana: up 112% on the route-weighted index since 1970.

Tree Swallow Population Forecast in Montana

If the recent trend holds, Tree Swallow in Montana is projected to rise about 19% by 2029 — from 6.2 in 2024 to a central estimate of 7.3 (95% range 5.2–9.4). A 5-year backtest shows a typical error of ±23.5%, with 80% of held-out values landing inside the 95% band.

+19%Change by 2029
7.3Projected 2029 index
5.2–9.495% range
±23.5%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
20257.04.99.1
20267.15.09.2
20277.25.19.3
20287.25.19.4
20297.35.29.4

Tree Swallow Survey Routes in Montana

Routes recording Tree Swallow in Montana.
Red Rock11520241973
St Xavier4520101991
Pablo Res.3920241995
Hebgen Lake3720242017
Chestnut2720241968
Clyde Park2420242018
Two Dot2120241976
Beaverhead2120241973
Kalispell1920241968
St. Mary 21920242009
Woodman1520241968
Elliston1520241968
Logan Pass1420241995
Ninemile1320241993
Philipsburg1220242015
Wise River1120241993
Freeman Creek1020162015
Fort Logan1020242018
Augusta920241978
Reed Point920241977
Clancy920232015
Polson820241979
Libby Dam720241979
Lima720241996
St Xavier 2720232018

Tree Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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