🌤 Weather at Walter J. Hayes State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 24–70 °F | 54–84 °F | 28–76 °F | 13–36 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Tipton 2WNW, 3 mi away, elevation 970 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
Hayes State Park is a public state park in Michigan near Onsted in Lenawee, Jackson, Washtenaw County. Spanning 654 acres and established in 1920, this park offers a peaceful retreat into nature for visitors of all ages.
Quick Facts
| State | Michigan |
| Nearest City | Onsted |
| County | Lenawee, Jackson, Washtenaw |
| Park Size | 654 acres |
| Established | 1920 |
| Google Rating | ⭐ 4.5/5 (600 reviews) |
| Accessibility | Accessible There are accessible restrooms and changing rooms in the beach house located in the day-use area on Wamplers Lake. JR’s Food Concessions runs a general store that sells food and camping items and rents float mats. available. Accessible There are accessible boating access sites on Wamplers and Round lakes. Please keep in mind that Round Lake is a no-wake lake and that parking is limited at this location. available. Accessible There is an accessible fishing pier located on Round Lake, adjacent to the boating access site. available. Accessible There is a picnic shelter located in the park’s day-use area that includes picnic tables, charcoal grills and electrical service (reservations only). Shelter reservations can be made 12 months in advance at MiDNRReservations.com. There are connected modern restrooms. available. |
Location & Getting There
Hayes State Park is located near Onsted, Michigan. The park’s coordinates are 42.0711, -84.1316.
Things to Do
Michigan’s state park system — one of the largest in the nation — stretches across two peninsulas surrounded by four Great Lakes, offering extraordinary variety. Activities include swimming and sunbathing on freshwater beaches that rival ocean coastlines, hiking sand dune bluffs with panoramic lake views, fishing for walleye, bass, and salmon in rivers and Great Lakes tributaries, camping in pine forests steps from the beach, kayaking along dramatic Pictured Rocks-style shorelines, mountain biking through rolling hardwood forests, cross-country skiing and snowmobiling in the Upper Peninsula, and exploring historic lighthouses dotting the coastline. Michigan’s state parks include some of the finest freshwater beaches in the world.
Best Time to Visit
Michigan’s park season centers on summer (June–August), when Great Lakes beaches warm up, trails are fully accessible, and campgrounds are buzzing with activity. Lake Michigan water temperatures peak in August (65–75°F). Fall (September–October) brings spectacular foliage — the Upper Peninsula and northern Lower Peninsula peak in late September, while southern parks follow in October. Spring (April–May) is muddy but great for wildflowers and waterfall viewing. Winter transforms many parks into Nordic skiing, snowshoeing, and ice fishing destinations. The Upper Peninsula receives 200+ inches of annual snowfall, creating a winter recreation paradise. Recreation Passport ($17) required for vehicle entry — add it to your license plate registration for the best value.
Visitor Tips
Michigan state parks require a Recreation Passport ($17 for Michigan residents, $34 for non-residents) for vehicle entry. Purchase it with your license plate renewal for automatic access all year. Camping reservations are made through the Michigan DNR reservation system up to 6 months in advance. Lakefront campsites at popular parks like Holland, Ludington, and Traverse City sell out within hours of opening. Bring warm layers even in summer — Great Lakes breezes can drop temperatures significantly near the water.
Explore More Michigan State Parks
Hayes State Park is one of many outstanding state parks in Michigan. Discover more parks in our Best State Parks in Michigan guide, or use our Park Finder to search by activity, location, or features.
Wildlife & Nature
Hayes SP — on Wamplers Lake in Lenawee County — provides swimming, camping, and fishing in Michigan’s Irish Hills region. The park’s rolling glacial terrain, lakes, and hardwood forest support white-tailed deer, coyotes, and wild turkeys. Large-mouth bass and bluegill fill the lakes. Great blue herons wade the shallows. Osprey dive for fish.
Nearby Attractions
Irish Hills — surrounding. Cambridge Junction HSP — 10 miles east — has the Walker Tavern. Michigan International Speedway — 15 miles east — has NASCAR. Adrian — 15 miles south.
More parks in Michigan: Watkins Lake State Park and County Preserve and Cambridge Junction Historic State Park. See the full Michigan state parks guide.
🐾 Dogs & Pets at Walter J. Hayes State Park
- Pets allowed? statewide rule
- Pets are welcome in Michigan state parks, campgrounds, harbors and state-designated trails, except designated swim beaches and other posted areas.
- Leash rule statewide rule
- Pets must always be on a 6-foot leash and under the owner's immediate control.
- Beaches & swim areas statewide rule
- Pets are prohibited in buoyed swim areas but allowed along the shoreline outside them (on a 6-ft leash, even in the water); 50+ parks have pet-friendly shoreline or designated dog beaches.
- Cabins & lodging statewide rule
- Up to two pets (cats and dogs only) allowed at ~12 parks' designated pet-friendly cabins, yurts and lodges; $10 per night per pet (cabins) or $15 (lodges); otherwise pets barred from overnight lodging.
- Pet fees statewide rule
- No day-use pet fee; pet-friendly lodging costs $10/night per pet (cabins) or $15/night per pet (lodges).
- Statewide exceptions statewide rule
- Leash laws do not apply to dogs used for hunting on land open to such use; pets may not be left unattended.
Are dogs allowed at Walter J. Hayes State Park?
Pets are welcome in Michigan state parks, campgrounds, harbors and state-designated trails, except designated swim beaches and other posted areas. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via michigan.gov. More: Michigan state parks guide · Dog rules in all 50 states compared
Park Location
Plan your gear for Walter J. Hayes State Park
From our editorial guides, matched to this park’s activities:
