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

Green Heron Population Trend in Iowa

All statesWetland birds

Green Heron in Iowa has edged down: down 14% on the route-weighted index since 1970.

-14%Since 1970
32Routes In State
49Years

Notable Green Heron Trends in Iowa

No notable trend signals for Green Heron in Iowa. See the full index history below.

Green Heron Population Forecast in Iowa

If the recent trend holds, Green Heron in Iowa is projected to fall about 21% by 2029 — from 0.14 in 2024 to a central estimate of 0.11 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±85%, with 100% of held-out values landing inside the 95% band.

-21%Change by 2029
0.11Projected 2029 index
0.00–0.2395% range
±85%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
20250.110.000.23
20260.110.000.23
20270.110.000.23
20280.110.000.23
20290.110.000.23

Green Heron Survey Routes in Iowa

Routes recording Green Heron in Iowa.
Davis Corner320051976
Exline220211976
Melrose220241988
Red Rock220031969
Washington219931980
Garner219921992
Gaza220011983
Tipton219941994
Mt Hamill120221972
Bedford120151972
College Spgs119711971
Bryant120071986
West Liberty119761976
Brooklyn119931970
Williamsburg119931970
Panther119991977
Wales119761976
Maquoketa119961973
Alice119991968
Prairieburg120121968
Hudson120211968
Dinsdale119921985
Kanawha119891977
Zearing119941971
Scranton119831983

Green Heron Population Trend in Other States

alabamaarizonaarkansascaliforniaconnecticutdelawarefloridageorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsin

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