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  • Barbara Hysell Monarch Butterfly

    Have you seen your first monarch?

    Be a citizen scientist and help Journey North track the first sightings monarchs, milkweeds, eggs, and caterpillars.

    Report your sightings to Journey North

  • One Marsh, Three Centers

    Horicon Marsh has three visitor centers, one federal, one state and one non-profit.

    Three Centers and Friends

  • Refuge National Map

    Check out details of Refuges across the United States. Set the zoom for detail.

    National Refuge System

  • St. Martin Island

    Expansion of the Green Bay NWR

    The Green Bay National Wildlife Refuge adds another 1290 acres with the additions of St. Martin Island and Rocky Island.

    Feature Story

Location / Hours

Refuge Facilities

Horicon National Wildlife, located in Mayville WI, encompasses the northern two-thirds of the Horicon Marsh. Refuge public use areas are open year-round - daylight hours. Visitor Center Hours: Jan-Mar & Dec: Monday-Friday 9a.m.- 4p.m. + 1 Sat/month. Dates for 2016: Jan 16, Feb 13, Mar 19, Dec 3. Apr-Nov: (Peak visitor season) Monday-Saturday 9 a.m.- 4 p.m. (+ Sun. in Oct.) Open July 4, Labor and Columbus Days. (*Closed all other federal holidays and noon closure on Christmas and New Years Eves*). The office and visitor center is located on Cty Rd. Z on the east side of Horicon Marsh.

About the Complex

Horicon Leopold Complex

Horicon National Wildlife Refuge is part of a Complex that includes Fox River, Green Bay and Gravel Island National Wildlife Refuges as well as Leopold Wetland Management District.

Horicon is managed as part of the Horicon Leopold Complex.

Learn more about the complex 

About the NWRS

National Wildlife Refuge System


The National Wildlife Refuge System, within the U.S. Fish and Wildlife Service, manages a national network of lands and waters set aside to conserve America’s fish, wildlife, and plants.

Learn more about the NWRS  

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Public Programs / Education

  • Public Programs and Events

    Refuge and marsh-wide.

    Horicon Marsh Public Programs and Events Spring/Summer 2016
  • Barbara Harvey Raptors of Wisconsin Exhibit

    Raptor Display Case

    This beautiful display graciously donated by local educator and raptor rehabilitator, showcases the many different species of hawks and owls found in Wisconsin.

  • Seeking Public Comments for Development of Refuge Hunt Plans

    Refuge management is seeking public input before the revision or development of hunt plans for Horicon, Fox River and Green Bay National Wildlife Refuges. All three refuges currently have comprehensive conservation plans (CCP’s) completed which identify goals, objectives, and broad strategies for refuge management which includes the hunt programs. However, staff would like to consider any additional public input before starting the environmental assessment process necessary to comply with the National Environmental Policy Act of 1969 (NEPA) and the further development of more detailed draft hunt plans for these refuges. If you would like to submit comments for one or all of these refuges, a comment form may be obtained at the link below. Please mail the comment forms to Steve Lenz, W4279 Headquarters Road, Mayville, WI 53050 or email the forms to or drop off at the refuge office by March 25, 2016 in order for your input to be included in the planning process. If you have any questions concerning the planning process please contact Steve Lenz, Project Leader - Horicon NWR/Leopold WMD at 920-387-2658 ext.111.

    Hunt Plan Scoping Meeting Comment Form
Page Photo Credits — All photos courtesy of USFWS unless otherwise noted.
Last Updated: Mar 11, 2016
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