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

Violet-green Swallow Population Trend in Montana

All statesAerial insectivores

Violet-green Swallow in Montana has risen sharply: up 69% on the route-weighted index since 1970.

+69%Since 1970
56Routes In State
55Years

Notable Violet-green Swallow Trends in Montana

long arc increasecomputed index

Violet-green Swallow has risen sharply in Montana: up 68% on the route-weighted index since 1970.

Violet-green Swallow Population Forecast in Montana

If the recent trend holds, Violet-green Swallow in Montana is projected to rise about 333% by 2029 — from 0.47 in 2024 to a central estimate of 2.0 (95% range 0.00–4.1). A 5-year backtest shows a typical error of ±457.3%, with 20% of held-out values landing inside the 95% band.

+333%Change by 2029
2.0Projected 2029 index
0.00–4.195% range
±457.3%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
20251.90.004.0
20262.00.004.1
20272.00.004.1
20282.00.004.1
20292.00.004.1

Violet-green Swallow Survey Routes in Montana

Routes recording Violet-green Swallow in Montana.
Willow Creek 22120181987
St Xavier1820102001
Laurel920081972
Sula820142013
Lima820241994
Pagil Gulch720232023
Cleveland620052004
Greenoagh 2620092009
Brunzell Slough620242021
Great Falls519731972
Maynard Coulee520242021
Elevation Mt420002000
Bull Mtn.420211999
Jordan420181988
Noxon420232002
Logan Pass320241980
Wolf Creek320172017
Ninemile320241994
Clyde Park320242022
Hebgen Lake320222017
Painted Rock320221992
St Regis220241986
Polson220091981
Arlee220241968
Woodman220231968

Violet-green Swallow Population Trend in Other States

alaskaarizonacaliforniacoloradoidahonebraskanevadanew-mexiconorth-dakotaoregonsouth-dakotatexasutahwashingtonwyoming

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