Based on 1,698 research-grade iNaturalist observations in Iowa, Red-winged Blackbird is most often recorded in May; in Iowa it behaves like a seasonal. It ranks #5 among birds recorded in the state in our data.
Agelaius phoeniceus
Red-winged Blackbird in Iowa by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Iowa in May

American Robin
Canada Goose

House Sparrow

Baltimore Oriole

Northern Cardinal

Rose-breasted Grosbeak
Gray Catbird

American Goldfinch
Places to look in Iowa
Botanical GardenDubuque Arboretum and Botanical Gardens
Bickelhaupt Arboretum
Iowa Arboretum
State ParkPikes Peak State Park
Cedar Rock State Park
Wildcat Den State Park
FAQ
When does Red-winged Blackbird appear in Iowa?
Mainly March–July, with the most records in May.
How common is Red-winged Blackbird in Iowa?
It ranks #5 by number of iNaturalist observations among birds in Iowa (1,698 records in our sample).