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Species · Utah · BBS 2025 Release · 1966–2024

Violet-green Swallow Population Trend in Utah

All statesAerial insectivores

Violet-green Swallow in Utah has surged: up 114% on the route-weighted index since 1970.

+114%Since 1970
94Routes In State
56Years

Notable Violet-green Swallow Trends in Utah

long arc increasecomputed index

Violet-green Swallow has surged in Utah: up 114% on the route-weighted index since 1970.

Violet-green Swallow Population Forecast in Utah

If the recent trend holds, Violet-green Swallow in Utah is projected to rise about 38% by 2029 — from 2.5 in 2024 to a central estimate of 3.4 (95% range 0.00–7.2). A 5-year backtest shows a typical error of ±37.4%, with 100% of held-out values landing inside the 95% band.

+38%Change by 2029
3.4Projected 2029 index
0.00–7.295% range
±37.4%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
20253.50.007.3
20263.50.007.2
20273.40.007.2
20283.40.007.2
20293.40.007.2

Violet-green Swallow Survey Routes in Utah

Routes recording Violet-green Swallow in Utah.
Bryce Canyon3720241990
Boulder3420211971
Hyrum3319791975
La Sal2920001994
Hardware Ranch2820181994
Canyonlands2620061991
Pine Creek2520131998
Main Canyon2120241987
La Sal 22020062003
Moab1720241986
Randolph1620241992
Hill Creek1519951993
Hite1420231986
Alton1420191998
Arches Np1320101989
Glen Canyon1220221992
Logan Canyon1120191997
Newcastle1020221997
Hanna920241997
Ant Flat-Ogden Can820231997
Lake Powell820091993
Book Ridge720182003
Woodruff720242002
Wasatch Nf620212002
Moon Lake620021993

Violet-green Swallow Population Trend in Other States

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