Grand Lake St. Marys State Park
The park entrance is 2.4 miles from St. Marys. Day use is free. Hours: Typically 6 a.m. to 11 p.m. daily. Grand Lake St. Marys State Park is a state park in Auglaize County, Ohio.
Grand Lake St. Marys State Park map
Grand Lake St. Marys State Park boundary from USGS PAD-US or the managing agency, simplified for display. Not for navigation or legal boundaries.
Fire restrictions
Agency fire restriction orders for this unit are not tracked here yet. Restrictions change with the season, so check the current orders before any campfire, stove or target shooting.
County and local burn bans may also apply on private, state, or county land nearby. On federal land, follow the land manager's order; off it, follow the strictest county or local rule that applies. When both touch your trip, obey both.
Common questions
- Grand Lake St. Marys State Park is free to visit. Hours: Typically 6 a.m. to 11 p.m. daily.
- Grand Lake St. Marys State Park is 2.4 miles from St. Marys.
- RV dump station on site. Flush restrooms.
- Yes, dogs are allowed at Grand Lake St. Marys State Park.
- Yes, Grand Lake is open to swimming at Grand Lake St. Marys State Park.
Before you go
Grand Lake St. Marys State Park is 2.4 miles from St. Marys.
- RV dump station on site
- Flush restrooms
What to see
- Historic site Visitor center Mentioned in Wikipedia park article
Swimming
- Grand Lake
- ohiodnr.gov (accessed 2026-09-30)
- en.wikipedia.org (accessed 2026-09-30)
- en.wikipedia.org (accessed 2026-09-30)
- www2.census.gov (accessed 2026-09-30)
- ohiodnr.gov (accessed 2026-09-30)
- ohiodnr.gov (accessed 2026-09-30)
- ohiodnr.gov (accessed 2026-09-30)
- ohiodnr.gov (accessed 2026-09-30)
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