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

Yellow Warbler Population Trend in Iowa

All statesForest birds

Yellow Warbler in Iowa has surged: up 201% on the route-weighted index since 1969.

+201%Since 1969
39Routes In State
57Years

Notable Yellow Warbler Trends in Iowa

long arc increasecomputed index

Yellow Warbler has surged in Iowa: up 201% on the route-weighted index since 1969.

Yellow Warbler Population Forecast in Iowa

If the recent trend holds, Yellow Warbler in Iowa is projected to fall about 16% by 2029 — from 1.5 in 2024 to a central estimate of 1.2 (95% range 0.70–1.7). A 5-year backtest shows a typical error of ±22.9%, with 100% of held-out values landing inside the 95% band.

-16%Change by 2029
1.2Projected 2029 index
0.70–1.795% range
±22.9%Backtest error
19672029
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
20251.20.631.7
20261.20.651.7
20271.20.671.7
20281.20.681.7
20291.20.701.7

Yellow Warbler Survey Routes in Iowa

Routes recording Yellow Warbler in Iowa.
Sioux City920241969
College Spgs 2720232005
Bryant420241967
Washta420141969
West Liberty320241969
Desmoines319791968
Davis Corner320231982
Mccallsburg320241996
Brooklyn220191973
Wales220181967
Maquoketa220241967
Clare220131975
Pierson220131973
Rock Valley220241970
Burchinal220241997
Mt Hamill120191997
Exline120241981
Melrose120241994
Bedford120161971
College Spgs120031967
Cedar Valley119961970
Williamsburg120231977
Red Rock120231969
Panther120241973
Washington120241967

Yellow Warbler Population Trend in Other States

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

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