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

White-throated Swift Population Trend in Washington

All statesAerial insectivores

White-throated Swift in Washington has risen sharply: up 62% on the route-weighted index since 1984.

+62%Since 1984
12Routes In State
38Years

Notable White-throated Swift Trends in Washington

long arc increasecomputed index

White-throated Swift has risen sharply in Washington: up 62% on the route-weighted index since 1984.

White-throated Swift Population Forecast in Washington

If the recent trend holds, White-throated Swift in Washington is projected to rise about 96% by 2028 — from 0.48 in 2023 to a central estimate of 0.94 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±156.7%, with 100% of held-out values landing inside the 95% band.

+96%Change by 2028
0.94Projected 2028 index
0.00–2.395% range
±156.7%Backtest error
19822028
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
20240.920.002.2
20250.930.002.2
20260.930.002.2
20270.940.002.2
20280.940.002.3

White-throated Swift Survey Routes in Washington

Routes recording White-throated Swift in Washington.
Moses Coulee2720231993
Harrington620122012
Curlew620132005
Lake Chelan420021990
Snowden419941994
Winthrop419831983
Ellensburg319841984
Yakima320041993
Rimrock220191984
Selah120022002
Ardenvoir119821982
Reardan120132002

White-throated Swift Population Trend in Other States

arizonacaliforniacoloradoidahomontananebraskanevadanew-mexicooregonsouth-dakotatexasutahwyoming

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