Waukesha County parks are open from sunrise to 10 p.m. Being in a county park outside those hours is prohibited without authorization. A daily or annual vehicle entrance permit is required (except Retzer Nature Center), and dogs must be leashed on a 6-foot-or-less leash.
The Waukesha County Park System (about 8,500 acres, including Retzer, Minooka, Fox River, Menomonee and Nashotah parks) posts official hours of Sunrise to 10 p.m. Visitors must leave by closing; after-hours presence without permission is not allowed and is enforced by park rangers and the sheriff. A daily or annual entrance permit is required for each vehicle except at Retzer Nature Center. Additional park rules include a 15 MPH speed limit, staying on designated trails, fires only in reserved-facility grills or fireplaces, and beer/wine only with a picnic permit (no liquor). These are county park regulations and apply within county parks, separate from municipal park curfews.
Remaining in a county park after hours or violating park rules can result in ejection and citation by park rangers or the Waukesha County Sheriff, with forfeitures under the park ordinance.
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