South Mountain State Park
- Status
- Open (per official listing)Daily 8 a.m. – sunset (Apr 1 – Sep 30)
- Entrance fee
- Statewide rule — see below
- Day-use reservations
- None mentioned
- Dogs
- Dogs allowed
- Camping
- None listed
- Official site
- dnr.maryland.gov(301) 791-4767
Official page last checked Oct 29, 2026. How we keep this current
Overview
Covering about 9,076 acres, South Mountain State Park lies in Washington County, about 9 miles northwest of Middletown.
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 | 8 a.m. – sunset | Apr 1 – Sep 30 |
| Daily | 10 a.m. – sunset | Oct 1 – Mar 31 |
Official wording
April through September: 8 a.m. to sunset; October through March: 10 a.m. to sunset
Source: official park page, checked Oct 29, 2026. Times are local to the park (America/New York).
Fees and passes
Many parks charge no fee. Veterans and active-duty military have day-use waivers. Per-park amounts:
Statewide fee rule from Maryland's park system; this park’s page doesn’t list its own fees.
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
Pets are allowed in South Mountain State Park.
Service animals are generally permitted where pets are not. Check with the park for specific areas.
Getting there
- Address
- 21843 National Pike
Boonsboro, MD 21713 - Nearest town
- Middletown — about 9 mi northwest (straight line)
- Coordinates
- 39.5542, -77.5997 (from Wikidata)
- Phone
- (301) 791-4767
- greenbrier.statepark@maryland.gov
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
- USGS PAD-US 4.1 (boundary and acreage)
“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