Ohio State Parks · Ohio
Grand Lake St. Marys State Park
Ohio State Parks · Ohio, United States
- Sites
- 187
- Hookups
- 177 electric, 33 with water, 10 no hookups
- Max RV length
- 62 ft
- Drinking water
- Yes
- Restrooms
- Yes
- Showers
- Yes
- Dump station
- Yes
- Pets
- Yes
- Elevation
- 899 ft
- Dark sky
- Bortle class 4
- Cell coverage
- T-Mobile weak · Verizon weak · AT&T good (carriers' 4G LTE filings to the FCC, 2025-12; not measured here)
- Lake
- Grand Lake St. Marys
- Nearest town
- Saint Marys
- Address
- 834 Edgewater Drive, Saint Marys, OH 45885
- Phone
- (419) 394-2774
- Activities
- Camping
187 numbered sites are mapped one by one - open the site map to pick yours.
About
Grand Lake St. Marys State Park's campground offers 187 sites in all, including 33 full-hookup and 144 electric-only. 7 cabins are also available. On-site amenities include a swimming beach, a playground, a seasonal camp store, coin-op laundry.
Fees
Electric $39/night Apr 1-Oct 31, $35/night Nov 1-Mar 31; Full Service $52/night Apr 1-Oct 31, $35/night Nov 1-Mar 31; Non Electric $29/night Apr 1-Oct 31, $25/night Nov 1-Mar 31. A $6.50 reservation fee applies per booking.
Weather, month by month
| Month | Typical high | Typical low | Coldest night | Hottest day | Years with a night below 32°F |
|---|---|---|---|---|---|
| January | 31° | 20° | -17° | 61° | 11 of 11 |
| February | 38° | 23° | -1° | 66° | 11 of 11 |
| March | 50° | 32° | 16° | 73° | 10 of 11 |
| April | 63° | 42° | 23° | 78° | 5 of 11 |
| May | 73° | 54° | 35° | 84° | 0 of 11 |
| June | 79° | 62° | 47° | 93° | 0 of 11 |
| July | 83° | 67° | 53° | 91° | 0 of 11 |
| August | 81° | 65° | 53° | 89° | 0 of 11 |
| September | 79° | 60° | 48° | 88° | 0 of 11 |
| October | 62° | 45° | 31° | 81° | 1 of 10 |
| November | 48° | 33° | 2° | 68° | 9 of 10 |
| December | 40° | 26° | -2° | 64° | 10 of 10 |
Mid-month figures from 2016–2026 of daily weather at this spot (ERA5 reanalysis via Open-Meteo, CC BY 4.0), in °F. Typical is the median; coldest and hottest are the extremes seen.
Nearby campgrounds
- Old Acadia Park No-Trace Camping · City, County & Regional Parks · 12 mi
- Lake Loramie State Park · Ohio State Parks · 14 mi · 170 sites
- Ottawa Metro Park Campground · City, County & Regional Parks · 25 mi · 30 sites
- Indian Lake State Park · Ohio State Parks · 29 mi · 462 sites
- Harter Park Campground · City, County & Regional Parks · 32 mi
All public campgrounds in Ohio · Every state and province · Facts read from the operator 2026-08-25. Confirm fees, rules and current status with the operator before you go.