Complete Guide: Greenbrier State Park — Featuring a beautiful 42-acre man-made lake perfect for swimming, bordered by the Appalachian Trail.
Picture this: a white sandy beach, crystal-clear swimming water, and families spread across blankets under the summer sun. Now add a twist—you’re at 1,400 feet elevation in the Appalachian Mountains, surrounded by forested ridges instead of ocean waves. Welcome to Greenbrier State Park, Maryland’s beloved “mountain beach” that draws over 200,000 visitors annually.
Tucked into a valley on South Mountain between Frederick and Hagerstown, this 1,408-acre park centers around its crown jewel: a 42-acre man-made lake with one of Maryland’s best freshwater swimming beaches. But Greenbrier offers far more than beach days—11 miles of hiking trails connect to the iconic Appalachian Trail, 164 wooded campsites provide overnight escapes, and winter transforms the landscape into a cross-country skiing haven.
Park Fast Facts
| 📍 Location | 21843 National Pike, Boonsboro, MD 21713 |
| 🗺️ Counties | Washington & Frederick Counties |
| 📐 Total Area | 1,408 acres (plus 42-acre lake) |
| ⛰️ Elevation | 1,411 ft (430 m) |
| 📅 Established | 1963 |
| 🚗 Distance from Baltimore | ~60 miles (1 hr 15 min) |
| 🚗 Distance from D.C. | ~65 miles (1 hr 20 min) |
Entrance Fees & Hours
Greenbrier uses a seasonal fee structure, with the highest fees during peak summer weekends when the beach is most popular.
| Season | Day/Time | Fee (Maryland Residents) |
|---|---|---|
| 🌞 Summer Peak (Memorial Day – Labor Day) | Weekends & Holidays | $5/person |
| 🌞 Summer (Memorial Day – Labor Day) | Weekdays | $3/person |
| 🍂 Shoulder (May & September) | Weekends | $3/person |
| ❄️ Off-Season (Oct – April) | All Days | $3/vehicle |
| Season | Park Hours |
|---|---|
| April – September | 8:00 AM – Sunset |
| October – March | 10:00 AM – Sunset |
⚠️ Summer Weekend Warning: The beach frequently reaches capacity by 11 AM on summer weekends. Arrive before 10 AM or choose weekdays to avoid being turned away.
Lake Greenbrier: The Mountain Beach
The 42-acre man-made lake is Greenbrier’s main attraction, drawing summer crowds for swimming, sunbathing, and kayaking. Unlike ocean beaches, there are no waves, no salt, and no undertow—making it ideal for families with young children.
| Feature | Details |
|---|---|
| 🏊 Beach Type | White sand freshwater beach |
| 💧 Water Quality | Tested by MD DNR; typically excellent |
| 🛟 Lifeguards | On duty Memorial Day – Labor Day (peak hours) |
| 🛶 Boat Rentals | Canoes & rowboats available (summer) |
| ♿ Accessibility | Beach wheelchair available at Visitor Center |
| 🚫 No Gas Motors | Electric motors only; kayaks/canoes welcome |
Hiking Trails
Greenbrier offers 11 miles of marked trails ranging from easy lakeside strolls to strenuous climbs connecting to the Appalachian Trail. The park sits on South Mountain, giving hikers access to spectacular ridgeline views.
| Trail Name | Distance | Difficulty | Highlights |
|---|---|---|---|
| 🔴 Big Red Trail | 5.0 mi loop | Moderate-Strenuous | Longest in-park loop; forest immersion |
| 🟡 Bartman’s Hill Trail | 1.8 mi one-way | Strenuous | Connects to Appalachian Trail! |
| 🟢 Lakeside Trail | 0.5 mi | Easy | Family-friendly; lake views |
| 🟠 Copperhead Trail | 1.2 mi | Moderate | Connects to Rock Oak Fire Trail |
| ⚪ Rock Oak Fire Trail | 1.5 mi | Moderate | Multi-use; mountain biking allowed |
| ⚪ Snelling Fire Trail | 1.0 mi | Easy-Moderate | Connector trail; gentle grades |
Appalachian Trail Access
The famous Bartman’s Hill Trail connects Greenbrier directly to the Appalachian Trail on the ridgeline above. From there, hikers can reach two iconic viewpoints:
| Destination | Distance from Park | What to Expect |
|---|---|---|
| 🪨 Annapolis Rock | ~4.5 mi one-way | Dramatic cliff overlook; sunset favorite; can be crowded |
| 🪨 Black Rock | ~5.5 mi one-way | Quieter alternative; 360° views from boulder field |
Camping
With 164 campsites spread across multiple wooded loops, Greenbrier is one of Maryland’s most popular camping destinations. Sites fill quickly on summer weekends—reserve well in advance.
| Site Type | Count | Features | Rate |
|---|---|---|---|
| ⛺ Standard Sites | ~100 | Fire ring, picnic table, tent pad | $21.50 – $31.50/night |
| ⚡ Electric Sites | ~40 | 30-amp hookup; RV-friendly | $28.50 – $38.50/night |
| 🐕 Pet-Friendly Loops | Designated | Dogs allowed; leash required | Same as site type |
| 🚿 Bathhouses | 2 | Hot showers, flush toilets | Included |
📢 2025 Note: Major renovations to the park entrance and registration building are scheduled for the 2025 season. Check the MD DNR website for construction updates before your visit.
Fishing
Lake Greenbrier offers year-round fishing opportunities. The lake is stocked by Maryland DNR, with the best trout fishing in spring and fall.
| Species | Best Season | Notes |
|---|---|---|
| 🐟 Rainbow Trout | Spring & Fall (stocked) | MD trout stamp required |
| 🐟 Largemouth Bass | Spring – Summer | Catch & release encouraged |
| 🐟 Bluegill | Year-round | Great for kids; plentiful |
| 🧊 Ice Fishing | Winter (when frozen) | Check ice thickness first! |
Seasonal Activities Guide
| Season | Best Activities | Conditions |
|---|---|---|
| 🌸 Spring (Mar-May) | Hiking, trout fishing, wildflowers | Mild temps; trails may be muddy; lake cold for swimming |
| ☀️ Summer (Jun-Aug) | Swimming, beach days, camping, boating | Hot & crowded; arrive early on weekends |
| 🍂 Fall (Sep-Nov) | Hiking, fall foliage, camping, fishing | Best hiking weather; stunning colors mid-October |
| ❄️ Winter (Dec-Feb) | Cross-country skiing, snowshoeing, ice fishing | Quiet & peaceful; no rentals available |
Wildlife
The mix of lake, forest, and meadow habitats supports diverse wildlife. Early morning visitors have the best chances for sightings.
| Animal | When to See | Where |
|---|---|---|
| 🦌 White-tailed Deer | Dawn & dusk | Forest edges; camping loops |
| 🦃 Wild Turkey | Spring mornings | Meadows near picnic areas |
| 🦅 Bald Eagle | Year-round | Soaring over the lake |
| 🐢 Snapping Turtles | Spring – Fall | Lake edges; nesting areas |
| 🦎 Eastern Box Turtle | Summer | Forest trails after rain |
| 🐍 Copperhead Snakes | Summer | Rocky areas; stay on trails |
Nearby Attractions
| Attraction | Distance | Why Visit |
|---|---|---|
| 🏔️ Washington Monument State Park | 3 miles | First monument to George Washington; Appalachian Trail |
| 🏰 Antietam National Battlefield | 12 miles | Civil War history; scenic driving tour |
| 🍎 South Mountain Creamery | 8 miles | Farm tours, ice cream, animals |
| 🍺 Antietam Brewery | 6 miles | Local craft beer; outdoor seating |
Frequently Asked Questions
Can you swim at Greenbrier State Park?
Yes! The 42-acre Lake Greenbrier has a sandy beach with lifeguards on duty from Memorial Day through Labor Day. The beach is the park’s main attraction and offers a rare “mountain beach” experience at 1,400 feet elevation. However, the beach frequently reaches capacity on summer weekends—arrive before 10 AM to guarantee entry.
Is the water safe to swim in?
Yes. Maryland DNR regularly tests the water quality. The lake is spring-fed and typically has excellent water clarity. Unlike ocean beaches, there’s no salt, no waves, and no undertow—making it especially safe for children.
Are dogs allowed at Greenbrier State Park?
Only in the Cedar and Dogwood camp loops and on trails outside the day-use area. When the swim ropes are in the water, pets are barred from the sandy portion of the beach and from the lake itself.
Can you access the Appalachian Trail from Greenbrier?
Yes! The Bartman’s Hill Trail provides direct access to the Appalachian Trail. From there, you can hike to Annapolis Rock (~4.5 miles) or Black Rock (~5.5 miles) for spectacular ridgeline views. This makes Greenbrier an excellent basecamp for AT day hikes.
What fish are in Lake Greenbrier?
The lake is stocked with rainbow trout (spring and fall) and also contains largemouth bass and bluegill. A Maryland fishing license is required, plus a trout stamp for trout fishing. In winter, ice fishing is permitted when the lake freezes sufficiently.
Is hunting allowed in the park?
Yes, hunting is permitted in designated areas during specific seasons. Check the MD DNR website for current hunting regulations, designated zones, and required permits. The beach and camping areas are always off-limits to hunting.
Nearby state parks: If you have extra time, Beach Day to Mountain Views: The Perfect Day at Greenbrier State Park is a short drive away, and Washington Monument State Park is a short drive away.
Plan Your Visit to Greenbrier State Park
Experience Maryland’s mountain beach—42 acres of freshwater swimming, 11 miles of trails to the Appalachian Trail, and 164 wooded campsites under the Appalachian sky.
📍 Address: 21843 National Pike, Boonsboro, MD 21713
🌐 Official Website: Maryland DNR – Greenbrier State Park
📞 Park Office: (301) 791-4767
🏕️ Camping Reservations: Maryland Park Reservations
Explore More Georgia State Parks
Greenbrier State Park is one of many outstanding state parks in Georgia. Discover more parks in our Best State Parks in Georgia guide, or use our Park Finder to search by activity, location, or features.
🐾 Dogs & Pets at Greenbrier State Park
Park policy: The Maryland Park Service sets Greenbrier's pet access park by park: dogs are limited to two of the campground loops, Cedar and Dogwood. Trail access with a dog has to start from the outlying parking areas rather than through the day-use area.
- Pets allowed?
- Only in the Cedar and Dogwood camp loops and on trails outside the day-use area
- Leash rule statewide rule
- 6 ft maximum in designated pet areas and 10 ft in undeveloped areas; off-leash under voice control only while swimming in designated areas
- Beaches & swim areas statewide rule
- At most parks pets are barred from sandy swim beaches from Memorial Day weekend through Labor Day; many parks allow shoreline swimming outside the swim beach
- Cabins & lodging statewide rule
- Most cabins are pet-free, but select parks designate pet-friendly cabins (e.g. Herrington Manor cabins 1-10, New Germany cabins 3-7)
- Park-specific rules
- When the swim ropes are in the water, pets are barred from the sandy portion of the beach and from the lake itself.
- Statewide exceptions statewide rule
- Pets not allowed in park buildings or playgrounds; pets must be licensed and vaccinated
- Dogs & wildlife
- This is black bear country — keep dogs leashed in the Cedar and Dogwood pet camping loops and on trails, and don't leave pet food sitting out.
Are dogs allowed at Greenbrier State Park?
Only in the Cedar and Dogwood camp loops and on trails outside the day-use area.
Beyond that, Maryland’s statewide rules apply.
Rules verified July 2026 via dnr.maryland.gov. More: Maryland state parks guide · Dog rules in all 50 states compared
🐻 Wildlife at Greenbrier State Park: What to Watch For — and Watch Out For
Worth watching for: Nearly eleven miles of trails wind through a variety of wildlife habitats, and the Appalachian Trail section through the park's eastern edge is promoted by Maryland DNR for bird and wildlife watching. The 42-acre lake is stocked with trout, largemouth bass, and bluegill.
Watch out for: Greenbrier sits in Maryland's Black Bear Country: Washington County is home to black bears, and you may encounter one while hiking, camping, or picnicking. Maryland DNR directs visitors to its Living with Black Bears guidance and BearWise.org — in practice, keep a clean campsite and never feed or approach a bear.
Are there bears at Greenbrier State Park?
Yes — see above for where they occur in the park and how to behave. Sightings are a normal part of a healthy park; incidents are rare when visitors keep distance and store food properly.
Wildlife information verified July 2026 via dnr.maryland.gov.
Park Location
Plan your gear for Greenbrier State Park
From our editorial guides, matched to this park’s activities:
