St. Mary's River State Park
Also known as Saint Mary's River State Park, Saint Mary's River State Park (Md.), Saint Marys River State Park, St Marys River State Park, St Marys River Watershed Park
- Status
- Open (per official listing)Daily 6 a.m. – sunset (May 1 – Sep 30)
- Entrance fee
- $3 per vehicle ($5 nonresident)Annual pass available
- Day-use reservations
- None mentioned
- Dogs
- Dogs allowed
- Camping
- None listed
- Official site
- dnr.maryland.gov(301) 872-5688
Official page last checked Oct 29, 2026. How we keep this current
Overview
St. Mary's River State Park is a park in St. Mary's County, about 8 miles east of Leonardtown.
Hours
Park, gate, office and facility hours are listed separately because they often differ. Alerts above override normal hours.
| Facility | Days | Hours | Season |
|---|---|---|---|
| Park | Daily | 6 a.m. – sunset | May 1 – Sep 30 |
| Daily | 7 a.m. – sunset | Oct 1 – Apr 30 | |
| Daily | sunrise – sunset | Oct 1 – Apr 30 | |
| Park | Daily | 6 a.m. – sunset | May 1 – Sep 30 |
| Daily | 7 a.m. – sunset | Oct 1 – Apr 30 |
Official wording
Site 1 (Lake) May through September: 6:00 a.m. to sunset October through April: 7:00 a.m. to sunset Site 2 (Wildlands) Sunrise to sunset Please note that the gate is automated and will accept credit or debit cards only, as well as the swipe card issued by the park.
Hours of operation (fees page): May through September: 6 a.m. to sunset October through April: 7 a.m. to sunset
Source: official park page, checked Oct 29, 2026. Times are local to the park (America/New York).
Fees and passes
| Item | Amount |
|---|---|
| Day-use Admission Fee: Maryland residents (resident) | $3 · vehicle |
| Day-use Admission Fee: Maryland residents (nonresident) | $5 · vehicle |
Official wording
Hours of Operations: May through September: 6 a.m. to sunset October through April: 7 a.m. to sunset Day-use Admission Fee: Maryland residents $3/vehicle; out-of-state residents $5/vehicle
Maryland park passes
- Maryland State Park and Trail Passport (annual) — $75 resident / $100 non-resident. Unlimited day-use entry for everyone in the vehicle (up to 10 people), unlimited boat launching, 10% concession discount Details
- Golden Age Pass (62+) — $10 processing fee, lifetime. Free day-use entry, half-price camping Sun–Thu, waived boat launch fees Details
- Universal Disability Pass. Free lifetime entrance to DNR public lands for holder + one person Details
- Youth Group Pass. Youth-group day use (not peak weekends) and youth group camping; valid two years Details
From the Maryland state guide. Confirm which passes this park accepts.
Reservations
- Day use
- No day-use reservation requirement mentioned
- Booking system
- Maryland State Park Reservation Service (parkreservations.maryland.gov); day use via parkdayuse.maryland.gov
- Phone
- 888-432-2267
We link to the official booking system rather than showing live availability, which changes minute to minute.
Pets
Dogs allowed
Leashed pets are allowed in St.
Service animals are generally permitted where pets are not. Check with the park for specific areas.
Getting there
- Address
- 21250 Camp Cosoma Road
Leonardtown, MD 20650 - Nearest town
- Leonardtown — about 8 mi east (straight line)
- Coordinates
- 38.2678, -76.4992 (from Wikidata)
- Phone
- (301) 872-5688
- pointlookout.statepark@maryland.gov
Google Maps directionsApple Maps
Directions from the park
Three miles north of Great Mills, 24 miles north of Point Lookout State Park, off MD Route 5 on Camp Cosoma Road.
Nearby state parks
Sources and freshness
- Maryland State Parks — park page — last checked Oct 29, 2026
- Maryland Park Service 'Find a State Park' directory (SharePoint HTML, links to /publiclands/Pages/{region}/{park}.aspx)
- Wikidata
“Last checked” is when our system last read the official source. No change has been detected since this page was first published. Hours, fees and rules can change without notice — confirm with the park before you go. Methodology