Horicon Marsh is a 33,000-acre wetland carved out by a continental glacier thousands of years ago. Horicon Marsh was historically destroyed by settlers who dammed and dredged the marsh and later drained it for farming.

Welcome to Horicon Marsh! At more than 33,000 acres, Horicon Marsh is one of the largest freshwater marshes in the United States and is a critical rest stop for thousands of migrating ducks and Canada geese.

Take a tour of Horicon Marsh through time, from the Ice Age and to present day, through our narrated, interactive exhibits. The Explorium awaits!

Three hiking trails can be found around the marsh. Activities include hiking, birding, photography, geocaching, fishing, paddling, sightseeing and more. Learn more about the Education & Visitor Center and the Explorium. The Horicon National Wildlife Refuge is open daily, year-round.

Horicon Marsh is a marsh located in northern Dodge and southern Fond du Lac counties of Wisconsin. It is the site of both a national and a state wildlife refuge. Horicon Marsh was created by the Green Bay lobe of the Wisconsin glaciation during the Pleistocene era.

Nestled in the heart of Southeastern Wisconsin, the Horicon Marsh is a breathtaking expanse of wetlands—recognized as a wetland of international importance and the largest freshwater cattail marsh in the contiguous United States.

From kayaking to hiking to birding, there’s always something to see and do at Horicon Marsh! Take a tour through time with our interactive exhibits featuring everyone’s favorite wetland. Encompassing more than 30,000 acres, Horicon Marsh has much to offer. Here are the hot spots!

The Ramsar Convention of the United Nations has formally recognized Horicon Marsh as a wetland of international importance. This renowned marsh is now home to the Horicon Marsh Education and Visitor Center. The Wildlife Education Program has been conducted at the marsh since the mid-1980s.

The largest freshwater cattail marsh in the United States, Horicon Marsh formed when Ice Age meltwater gathered behind a moraine. Recognized for its ecological importance by organizations like the United Nations and the National Audubon Society, massive numbers of migrating birds – 350,000 geese and ducks alone, and more than 300 species in ...

Named for the Algonquin word meaning land of clean, pure water, the peaceful landscape of Horicon Marsh serves as a stunning backdrop for making memories with your favorite people.