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

Blue-gray Gnatcatcher Population Trend in Iowa

All statesForest birds

Blue-gray Gnatcatcher in Iowa has increased: up 28% on the route-weighted index since 1980.

+28%Since 1980
18Routes In State
42Years

Notable Blue-gray Gnatcatcher Trends in Iowa

No notable trend signals for Blue-gray Gnatcatcher in Iowa. See the full index history below.

Blue-gray Gnatcatcher Population Forecast in Iowa

If the recent trend holds, Blue-gray Gnatcatcher in Iowa is projected to fall about 26% by 2029 — from 0.14 in 2024 to a central estimate of 0.10 (95% range 0.00–0.30). A 5-year backtest shows a typical error of ±58.3%, with 100% of held-out values landing inside the 95% band.

-26%Change by 2029
0.10Projected 2029 index
0.00–0.3095% range
±58.3%Backtest error
19742029
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
20250.110.000.31
20260.100.000.31
20270.100.000.30
20280.100.000.30
20290.100.000.30

Blue-gray Gnatcatcher Survey Routes in Iowa

Routes recording Blue-gray Gnatcatcher in Iowa.
West Liberty219911991
Brooklyn220062003
Maquoketa220191993
Washta220102008
Mt Hamill120241974
Exline120232007
Melrose120242002
Bedford120172007
Cedar Valley119961979
College Spgs 2120172017
Red Rock120042004
Tipton119941993
Panther120161987
Wales120142014
Prairieburg119901990
Hudson120122012
Lafayette120242003
Festina120131980

Blue-gray Gnatcatcher Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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