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Wildlife refuge · Iowa

Union Slough National Wildlife Refuge

Union Slough National Wildlife Refuge is run by the U.S. Fish and Wildlife Service. Its own timing: April.

Union Slough National Wildlife Refuge in pictures

Illustrative photos, not current conditions
Migrating waterfowl at Union Slough National Wildlife Refuge
Migrating waterfowl at Union Slough National Wildlife Refuge. Photo: USFWS · public domain

What the U.S. Fish and Wildlife Service says

“Established in 1938 as a migratory waterfowl refuge, Union Slough National Wildlife Refuge provides critical habitat for native prairie and wetland wildlife in a landscape dominated by intensive agriculture.”
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When to go

In the source's own words; no peak claimed unless the source says so
  • April“Later arriving waterfowl such as blue-winged teal and gadwall peak in April as a wide array of herons, egrets, ibis, shorebirds, songbirds and raptors such as peregrine falcons join the fray.”
  • August“For early migrating shorebirds, fall actually begins in late July and peaks in August.”

Before you go

Early morning and evening are typically the best times to observe wildlife, because that’s when animals are most active.

How we know

Every fact on this page, from these pages