Cancellation alerts

Grand Lake St. Marys State Park

We watch every site at Grand Lake St. Marys State Park 24/7, then email you the moment a cancellation opens up.

100% of weekends booked at top sites·Peak May–Jul·198 sites

Set up an alert for Grand Lake St. Marys State Park →

Pick your dates, pick the sites you want, we do the watching.

Park favorites

The 10 most popular campsites at Grand Lake St. Marys State Park

Booked on virtually every weekend during peak season (May–Jul). They reserve months ahead and rebook within minutes when cancelled — set up an alert and we'll email you the moment one opens.

Site 011

Best here

Ranked #1 of 198

Full-Hookup · Sleeps 6

Site 125

Top pick

Ranked #2 of 198

Full-Hookup · Sleeps 6

Site 015

Top pick

Ranked #2 of 198

Full-Hookup · Sleeps 6

Site 016

Top pick

Ranked #4 of 198

Full-Hookup · Sleeps 6

Site 121

Top pick

Ranked #5 of 198

Full-Hookup · Sleeps 6

Site 046

Top pick

Ranked #5 of 198

Full-Hookup · Sleeps 6

Site 012

Top pick

Ranked #5 of 198

Full-Hookup · Sleeps 6

Site 124

Top pick

Ranked #8 of 198

Full-Hookup · Sleeps 6

Site 040

Top pick

Ranked #8 of 198

Full-Hookup · Sleeps 6

Site 041

Top pick

Ranked #8 of 198

Full-Hookup · Sleeps 6

These sites rebook within minutes of being cancelled. Set an alert at Grand Lake St. Marys State Park and we’ll email you the moment one opens up.

Set up an alert →

About this park

Originally constructed as a feeder reservoir for the Miami-Erie Canal, Grand Lake St. Marys was for many years recognized as the largest man-made reservoir in the world. The 13,500-acre lake is the gateway to swimming, boating, camping in a 198 site campground and fishing in one of Ohio's oldest state parks. Camping Hiking Swimming Boating Fishing Horseshoes Volleyball Nature Programs Pet Friendly Cabin