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Greenbrier State Park

21843 National Pike Boonsboro, MD 21713

Activity Outdoor $

The basics

Address
21843 National Pike Boonsboro, MD 21713
Type
Activity
Setting
Outdoor
Price
$

Quick facts

Stroller
Partial
Wheelchair
Partial
Nursing room
No
Changing table
No
Noise
Moderate
Sensory load
Low
Best in Spring · Summer · Fall Skip in rain Hot-day OK Skip when freezing

Greenbrier State Park

Address: 21843 National Pike, Boonsboro, MD 21713 Website: https://dnr.maryland.gov/publiclands/Pages/western/greenbrier.aspx Type: Activity Setting: Outdoor Price: $

Overview

A 1,408-acre state park on South Mountain about three miles east of Boonsboro, built around a 42-acre man-made lake with a 1,000-foot sandy beach. Established in 1963, it's the closest "real beach day" most DMV families can get without driving to the Bay or Ocean City — clear, shallow, freshwater, sandy bottom (no Bay sea nettles, no surf), and ringed by shaded picnic groves. Beyond the beach, the park has eleven miles of hiking trails (10 named loops from 0.4 to 5.2 miles), a campground with 156 sites, four lakefront gazebos, and a corner where the Appalachian Trail clips through on its way north.

Sweet spot is ages 2 through 12. Toddlers and preschoolers stick to the roped-off shallow swim area (the deepest section of the inner rope is roughly 3 feet); 6–10s graduate to the deeper rope, the paddleboats, and the easier trails; tweens get the longer loops and the Appalachian Trail spur up to Annapolis Rock. Skip it on a rainy day (it's almost all outdoors), skip it in deep winter (lake closed, beach roped off), and do not show up on a summer weekend without a day-use reservation — the parking lot fills and the gate turns cars away.

What to know before you go

  • Hours: April–September: 8 a.m. to sunset. October–March: 10 a.m. to sunset. Office at 301-791-4767. Confirm on the official park page — there's been ongoing entrance construction in 2025 that pushed gazebo reservations.
  • Day-use reservations (this is the big one): Weekends and holidays from Memorial Day through Labor Day require an advance day-use reservation in 2026 through parkreservations.maryland.gov or 1-888-432-2267. This was piloted in 2025 and expanded for 2026 — the trade-off is no more capacity-closure turnaways, but you can't wing it. Weekdays remain walk-up.
  • Day-use fees: Memorial Day through Labor Day, $3/person weekdays, $5/person on weekends and holidays. May and September weekends, $3/person. Day after Labor Day through Friday before Memorial Day, $3/vehicle. Out-of-state visitors add $2 to all charges. Free: kids in car seats, Golden Age Pass holders, Universal Disability Pass holders, and veterans with ID. Cash and card both work at the booth.
  • Swim hours: Lifeguards on duty 11 a.m.–6 p.m., Memorial Day weekend through Labor Day, swim ropes deployed only during those hours. No swimming at any other time — outside lifeguard hours, even chest-deep wading on the beach is closed water. Plan around it.
  • Lake: 42 acres, sandy bottom, two roped-off swim zones (a shallow toddler zone capped around 3 feet, plus a deeper area). Three beach segments: Middle Beach is the main one (closest to bathhouse, snack stand, and parking), Right Beach has the boat rentals, Left Beach has the volleyball court and is where bigger groups land.
  • Boat rentals: Rowboats and paddleboats by the half-hour or hour at Right Beach during the summer. No canoe or kayak rentals — bring your own if you want one (private boats allowed, but the lake is electric trolling motor only — no gas engines). Lake is stocked with trout, largemouth bass, and bluegill; anglers 16+ need a Maryland fishing license.
  • Trails: Eleven miles, 10 named trails ranging from 0.4 to 5.2 miles. Family-friendly options: Snelling Fire Trail (1 mile, mostly flat with one steep section, silver blaze), Water Tank Trail, and the lakeside half of the Big Red Trail. Bartman Hill Trail (0.6 miles, light blue blaze, strenuous and steep) climbs up to the Appalachian Trail and the Monument Knob/Washington Monument loop — that's a real hike, not a stroller path. Trails are rocky.
  • Camping: 156 sites total (39 with electric, 111 non-electric, plus 4 picnic shelters). 2026 season runs April 3 through October 31. Rates: non-electric $21.50–$22.50/night, electric $27.50–$28.50/night, before weekend/holiday and out-of-state surcharges. Loops are Ash, Birch, Cedar, and Dogwood. Bathhouses with hot showers. Reserve up to 365 days ahead at parkreservations.maryland.gov.
  • Gazebos and picnic shelters: Four lakefront gazebos rentable at roughly $101–$106/day plus entry fees through the reservation system. For free use, picnic tables and grills are scattered through the day-use grove with no rental needed.
  • Parking: Free with the day-use fee. Lot is closest to Middle Beach and the bathhouse — a short walk to the water with a cooler. The lot fills on summer weekends and the park stops admitting cars when it does. The reservation system is the only reliable way around this on a Saturday in July.
  • Bathrooms and changing: Bathhouse with flush toilets, cold-water rinse showers, and changing rooms near Middle Beach. Generally clean for a state park; don't expect a hotel pool. No dedicated nursing room and no formal changing tables — bring a portable pad. The bathhouse is the most private spot to nurse, or the shaded picnic grove with a cover-up.
  • Concession stand: Open Memorial Day through Labor Day, near the bathhouse. Hot dogs, fries, ice cream, drinks. Fine for a snack run; not the meal you're driving 70 miles for.
  • Pets: Allowed in the campground only at Cedar and Dogwood loops, and on hiking trails year-round, but NOT in the day-use beach area between Memorial Day and Labor Day. Pets are welcome in the day-use area only from the day after Labor Day through the Friday before Memorial Day. Check signage if you're showing up shoulder season.
  • Alcohol: Prohibited park-wide. Don't pack a cooler with beer expecting a chill day-drink — rangers do check.
  • Accessibility: Visitor center and main bathhouse are ADA accessible. A beach wheelchair is available — ask at the office or visitor center on arrival. Some campsites are accessible. Trails are mostly unimproved natural surface and are not wheelchair-friendly.
  • Cell signal: Spotty. Verizon and T-Mobile are usable near the lake; expect 1–2 bars on the back trails and dead zones in parts of the campground.
  • What to bring: Day-use reservation confirmation if it's a summer weekend, water shoes (the bottom is sandy but there are pebbles), beach towels and a shade tent (left half of the beach has open sun), sunscreen and hats, a packed lunch (the snack stand is fine, not a meal), water bottles, a portable changing pad, a real fishing license if you're 16+, and a Maryland fishing/state-park map if you're hiking the AT spur.

Tips for families

  • Get the day-use reservation the moment you decide to go. parkreservations.maryland.gov opens day-use slots well ahead of the date. Saturdays in July and August book up. Greenbrier was one of the original five parks in the 2025 pilot and it's the most-reservation-constrained of the bunch on the western side.
  • Show up by 10 a.m. on weekends, even with a reservation. The reservation guarantees entry, not a good picnic spot. The shaded grove tables behind Middle Beach go fast on a hot day; arriving at noon means setting up on open grass with no shade.
  • Park at Middle Beach and stay there with little kids. The walk from the lot to Middle Beach is the shortest walk on the property to the water — under five minutes with a cooler and a wagon. Right Beach and Left Beach are longer hauls and don't offer enough extra to justify the slog.
  • The shallow swim rope is the toddler win. It caps around 3 feet and is the entire reason this is a top under-5 destination in the region. Sandy bottom, no waves, no current — kids who hate the Bay's sea nettles and the ocean's surf love this lake. Get there at 11 a.m. when lifeguards open the rope and you'll have an hour before it crowds.
  • Pack the picnic; the snack stand is a backup. Picnic tables and grills are plentiful and free. Outside food is welcome. The concession stand is fine for an ice cream after swim, not for lunch — a cooler with sandwiches, fruit, and drinks saves $40 for a family of four.
  • Rent a paddleboat for an hour, not a half-hour. Paddleboats are slow, kids take 10 minutes to figure out the pedals, and a half-hour evaporates. An hour gets you across the lake and back at a kid-pacing.
  • For a 3-and-up "real hike," do Snelling Fire Trail or the lakeside Big Red. Snelling is 1 mile, mostly flat, one short steep middle stretch — kids can handle it. Avoid Bartman Hill with under-7s unless your kid has done a steep climb before; it's a quarter-mile of legitimate elevation up to the AT.
  • Drive five extra minutes to Washington Monument State Park for the view. The original 1827 stone tower is a mile away on South Mountain, free to enter, and the climb is 30 vertical feet of interior stairs that kids handle easily. It's the cleanest "did a hike, got a view" outing in the area and pairs perfectly with a Greenbrier morning.
  • The campground is the value play. Two nights at $22–$28 per site plus the lake right there is the cheapest two-day family adventure in Maryland. Cedar and Dogwood are the dog-friendly loops; Cedar has electric, Dogwood doesn't. Reserve in February for prime summer weekends.
  • Skip swim hours; do trails. The lake is open daily even when swim isn't allowed — the trails, the picnic grove, the boat launch, and the fishing dock all stay open from open-to-sunset. A shoulder-season Saturday in October is a beautiful, near-empty park, and you only pay $3 per vehicle.
  • Budget a real change of clothes per kid. The bathhouse has changing rooms but they're tight and busy on a hot afternoon. Most local families change at the car. A second towel, dry shirt, and dry shorts per kid in a tote is the difference between a calm drive home and a damp meltdown.
  • Lifeguards close the rope hard at 6 p.m. Don't try to sneak a "just one more dip." They clear the swim area and they mean it. Plan dinner/exit right after.

Best time to visit

  • Time of day: 11 a.m. on the dot when swim ropes go up is the calmest hour of the day. The 1–4 p.m. window is the most crowded; after 4 p.m. crowds thin as day-trippers pack up. Sunset hikes are gorgeous in spring and fall — pay $3 vehicle, do Snelling, drive home.
  • Day of week: Weekdays in summer. Weekend days require a reservation and the beach gets crowded fast. Tuesday and Wednesday mornings are the regional sweet spot; the lake is half-empty, parking is wide open, and there's no reservation hassle.
  • Season: Mid-June through mid-August is the headline season — lifeguards on, full concession, all rentals running, lake at swim temperature. Memorial Day weekend is the unofficial opener. September weekends are still $3/person and the water stays warm through Labor Day. October–March drops to $3/vehicle and the lake is hike-and-look-at-only — beautiful, almost empty, and you can do real trail miles without summer heat.
  • Weather contingency: Rain is bad here. The park is overwhelmingly outdoor, the trails get rocky-slick, and the beach is closed in storms. Pivot inside on rainy days — Hagerstown's Discovery Station is 15 minutes north, and Frederick's Children's Museum of Rose Hill Manor Park is 20 minutes east. Hot day (90°F+) is actually one of the best times — lake water is the answer; just bring a shade tent because the open beach is direct sun.

FAQs

Do I need a reservation? Yes — for day-use entry on weekends and holidays from Memorial Day through Labor Day in 2026. Book at parkreservations.maryland.gov or call 1-888-432-2267. Weekdays are walk-up. Camping always requires a separate reservation up to 365 days ahead. Without a day-use reservation on a summer weekend, the gate will turn you away.

How much does it cost? $3 per person weekdays, $5 per person on summer weekends and holidays during the Memorial Day–Labor Day window. Off-season it's $3 per vehicle. Out-of-state visitors pay $2 more. Kids in car seats, veterans with ID, Golden Age Pass holders, and Universal Disability Pass holders are free.

Is there parking? Yes — free with the entry fee. The lot fills on summer weekends and the park stops admitting cars when it's full; the reservation system is the only way to guarantee entry on a busy day. The lot sits closest to Middle Beach and the bathhouse — a short walk with a cooler and stroller.

How long should we plan for? 4–6 hours for a beach day. Arrive 10–11 a.m., set up, swim through the lifeguard window (11–6), eat lunch, do a paddleboat hour, and exit. A pure hiking visit is 2–3 hours including a stop at the lake to look. Camping is the natural way to make this a full weekend.

What ages is this best for? 2 through 12. The shallow rope (3 feet deep) is genuinely toddler-safe and the sandy bottom makes it the most under-5-friendly natural water in the DMV. Tweens get the deeper rope, paddleboats, fishing, and the AT spur up Bartman Hill. Teens lose interest fast unless they're hiking.

Can we bring our own food? Yes — outside food and non-alcoholic drinks are welcome. Picnic tables and grills are everywhere. Alcohol is banned park-wide. The on-site concession stand is open Memorial Day through Labor Day and sells hot dogs, fries, drinks, and ice cream — fine for an in-day snack, not enough for a meal.

Is it stroller-friendly? Partially. The paved paths from the parking lot to the bathhouse, snack stand, and the grass behind Middle Beach roll fine. Sand stops a stroller and trails are rocky natural surface — strollers don't go on most of them. Bring a wagon if you're hauling beach gear with little kids.

Is there a place to nurse or change a baby? The bathhouse near Middle Beach has changing rooms but no dedicated nursing room and no built-in changing tables. Bring a portable pad. The bathhouse is the most private place to nurse; the shaded picnic grove with a cover-up is the second-best.

Are dogs allowed? Not at the day-use beach between Memorial Day and Labor Day. Dogs are welcome on hiking trails year-round and in the Cedar and Dogwood camping loops only. From the day after Labor Day through the Friday before Memorial Day, dogs are allowed in the day-use area on a leash.

Is it good in the rain? No. Greenbrier is overwhelmingly outdoor — beach, trails, picnic grove, boat rental — and the lake closes in storms. Save it for a dry day.

Is it good on a 90°F day? Yes — this is what the lake is for. The shaded picnic grove and the cool, shallow water make Greenbrier one of the best hot-day picks in western Maryland. Bring a shade tent for the open-sun half of the beach.

Can we camp here? Yes. 156 campsites across Ash, Birch, Cedar, and Dogwood loops, season runs April 3–October 31, 2026. Non-electric runs $21.50–$22.50/night, electric $27.50–$28.50/night, before weekend/holiday and out-of-state surcharges. Bathhouses with hot showers. Reserve at parkreservations.maryland.gov up to 365 days ahead — Cedar electric sites for prime summer weekends book months in advance.

Helpful links

Operational details verified May 2026. Hours and prices drift — confirm on the official site before you drive.

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