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

White-throated Swift Population Trend in Colorado

All statesAerial insectivores

White-throated Swift in Colorado has surged: up 244% on the route-weighted index since 1973.

+244%Since 1973
59Routes In State
52Years

Notable White-throated Swift Trends in Colorado

long arc increasecomputed index

White-throated Swift has surged in Colorado: up 244% on the route-weighted index since 1973.

White-throated Swift Population Forecast in Colorado

If the recent trend holds, White-throated Swift in Colorado is projected to rise about 152% by 2029 — from 0.44 in 2024 to a central estimate of 1.1 (95% range 0.35–1.9). A 5-year backtest shows a typical error of ±114.9%, with 80% of held-out values landing inside the 95% band.

+152%Change by 2029
1.1Projected 2029 index
0.35–1.995% range
±114.9%Backtest error
19702029
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
20251.10.311.8
20261.10.321.9
20271.10.331.9
20281.10.341.9
20291.10.351.9

White-throated Swift Survey Routes in Colorado

Routes recording White-throated Swift in Colorado.
Rosevale1820242009
Castleton1019911991
Rifle Falls1020211998
Douglas Pass620241982
Uncompahgre620191990
Piceance Basin620031998
Cortez620061988
Dolores Riv519951995
Thomasville520061993
Paonia520241992
Lizard Head Pass520152001
Aspen419901979
Wray Gulch420231988
Tarryall420142014
Yellowjacket Pass420241998
Harmony320231973
Mesaverde Np320241996
Lake City320032003
Baxter Pass320241996
Guanella Pas320091997
Westcliffe319991999
Yampa220221970
Dolores219841972
Cortez 2220152010
Red Cliff220241994

White-throated Swift Population Trend in Other States

arizonacaliforniaidahomontananebraskanevadanew-mexicooregonsouth-dakotatexasutahwashingtonwyoming

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