Grand Lake St. Marys State Park

Saint Marys, Ohio · Campsite openings, cancellations & sold-out date alerts

Lakes & RiversSmall parkWatched around the clock

Weekend availability

Live from Ohio State Parks · checked Sep 19, 5:25 AM PT

Sold out 1 of the next 6 weekends — exactly when cancellation alerts earn their keep.

  • Fri, Sep 18
    Sold out
  • Fri, Sep 25
    Open
    3/3 campgrounds
  • Fri, Oct 2
    Limited
    1/3 campgrounds
  • Fri, Oct 9
    Open
    3/3 campgrounds
  • Fri, Oct 16
    Open
    3/3 campgrounds
  • Fri, Oct 23
    Open
    3/3 campgrounds
Alert me when a sold-out weekend opens

Sold out for your dates? We'll tell you the second a site opens.

Cancellations at Grand Lake St. Marys State Park get rebooked in minutes. We check Ohio State Parks around the clock and alert you before the crowd refreshes the page.

Set an alert for Saint Marys$9.99/mo — why we charge

Not ready to subscribe? Get a free weekend heads-up.

We'll email you if Grand Lake St. Marys State Park opens up for a weekend you pick. No account needed.

How booked is Grand Lake St. Marys State Park?

as of July 23

Sites are open right now — we found space out to Jan 2027. That changes fast at a state park. We check Grand Lake St. Marys State Park around the clock, so the moment your dates fill up and a cancellation reopens them, you'll be first to know. Weekdays still have room — for now.

Weekends (Saturday night)

Aug 8Open
Oct 24Open
Jan 9Open

Weekdays (Wednesday night)

Aug 19Open
Nov 4Open

Availability checked directly against the reservation system, out to 6 months ahead.

Park type

Lakes & Rivers

Small park

Online booking

Available on Ohio State Parks

Official state reservation system

Alert coverage

Checked around the clock

Openings, cancellations & new dates

Where Grand Lake St. Marys State Park is

834 EDGEWATER DRIVE

Saint Marys, OH 45885

40.5450, -84.4382

Get directions

Getting a campsite at Grand Lake St. Marys State Park

How do I get a campsite at Grand Lake St. Marys State Park when it's sold out?

Cancellations happen constantly — the trick is being first to know. Set an alert for your dates and we'll watch Grand Lake St. Marys State Park on Ohio State Parks around the clock, then notify you the moment a site opens. Alerts run on a Pro subscription ($9.99/mo, cancel anytime).

When do campsites usually open up at Grand Lake St. Marys State Park?

Whenever someone cancels. Most reservation systems refund less the closer you get to arrival, so cancellations cluster in the days before a stay — but the openings themselves are unpredictable, which is exactly why watching for them beats refreshing the page.

Where do I book a campsite at Grand Lake St. Marys State Park?

Reservations for Grand Lake St. Marys State Park are made on Ohio State Parks, the official booking system for Ohio State Parks. GetParkAlerts is independent — we tell you when a site opens; you book it directly on the official site.

Parks near Grand Lake St. Marys State Park

Flexible on where you camp? Watch a few of these too — more parks, better odds.

All Ohio lakes & rivers →Browse all Ohio state parks →All Ohio camping — parks, federal & military →Open this weekend →Sold out this weekend →Ohio closures & advisories →See every Ohio park on the map →