Updated Sep 29
Pictured: Port Louisa Refuge · typical peak lookIowaspring migration
When does spring bird migration peak in Iowa?
Spring bird migration usually peaks from February to June.
Updated Sep 29.
Places by state
Iowa
- Port Louisa RefugeSeason over
Local timing: Apr 1–May 31
Official reports
Dated and linked
- Sep 28Park ServiceVisitor tips by month, trails, hours, fees, restrooms and what to bringSource (opens U.S. Fish and Wildlife Service, Port Louisa NWR: Visit Us in a new tab)
How do you track spring migration? Each place moves through 4 stages: Birds arriving, Numbers building, Peak numbers and Birds moving on. Every stage we show comes from a dated report with its source, and every forecast lists its sources.