56°
Partly Sunny
7%
48
Washington County, MD · Lake
Greenbrier State Park
21843 National Pike, Boonsboro, MD 21713
42-acre man-made freshwater lake with a white-sand swim beach on South Mountain northeast of Boonsboro. Popular with DC/Baltimore day-trippers, so MD DNR now requires advance reservations on weekends/holidays Memorial Day–Labor Day.
Today's Conditions
Decent day for photography.
56°F air
Full NWS forecast for This Afternoon
Partly sunny, with a high near 56. Northwest wind 15 to 18 mph, with gusts as high as 30 mph.
Tonight
Partly cloudy, with a low around 41. Northwest wind 12 to 15 mph, with gusts as high as 26 mph.
Weather
- 56°F air — chilly for a beach day
- 18 mph wind — breezy — anchor everything
- Sunny skies — clear conditions
48 /100
ok
35 Sunbathe
63 Walk
54 Fish
65 Photo
Best for photography today
Atmosphere
Air Temp
56°F
Partly Cloudy
Wind
15 to 18 mph
NW
Rain
7%
This Afternoon
Air Quality
29 Good
Ozone · Lower Eastern Shore
UV Peak
3 Moderate
Peaks 11 AM · burn in ~67m
Burn-free before 10 AM & after 02 PM
Tomorrow
63°F
Sunny
Water
Water Temp
—
Sun & Moon
Sunrise
6:45 AM
Sunset
5:02 PM
Moon · 5%
Waning Crescent
Spring tides — bigger range
7-Day Beach Day Forecast
63°
Sunny
0%
65
60°
Mostly Sunny
1%
53
67°
Sunny
0%
73
64°
Mostly Sunny
1%
70
57°
Chance Light Rain
52%
26
49°
Chance Light Rain
47%
16
What to Bring Today
- recommended Layers / windbreaker Only 56°F outside
Always remember water bottle, trash bag (leave no trace).
Best Fishing Times Today
Solunar theory: fish activity peaks at moon transits (major) and moonrise/moonset (minor). All times local.
Major
9:20 PM - 11:20 PM
Minor
4:50 AM - 5:50 AM
Major
9:30 AM - 11:30 AM
Minor
3:30 PM - 4:30 PM
Beach Info
Parking
State park lot.
Dogs
Dogs permitted on leash in designated areas; not on swim beach.
Entry Fee
$3/person MD resident, $5/person out-of-state (May/Sep weekends); higher in-season. Advance day-use reservation required weekends & holidays Memorial Day–Labor Day.
Address
21843 National Pike, Boonsboro, MD 21713
Amenities
Frequently Asked
Is it safe to swim at Greenbrier State Park today?
Greenbrier State Park shows a live water-quality reading (bacteria levels) and today's swim-safety score at the top of this page, refreshed on every update. Seasonal lifeguards patrol the swim area in summer — follow their flags. Always review the current advisories, surf, and rip-current notes before getting in the water.
Is Greenbrier State Park dog-friendly?
Dogs permitted on leash in designated areas; not on swim beach.
Is there an entry fee at Greenbrier State Park?
$3/person MD resident, $5/person out-of-state (May/Sep weekends); higher in-season. Advance day-use reservation required weekends & holidays Memorial Day–Labor Day.
Are there lifeguards at Greenbrier State Park?
Yes. Seasonal lifeguards patrol Greenbrier State Park during the summer swim season (typically Memorial Day through Labor Day). Outside that window, swim at your own risk.
What amenities are at Greenbrier State Park?
Amenities at Greenbrier State Park include lifeguards, beach, camping, boat launch, boat rentals, fishing, trails, restrooms.
When is the water warmest at Greenbrier State Park?
Inland lakes peak in July and August at 75-80°F and hold warmth longer than tidal beaches. Swimming comfortable from mid-June through September.
Where is Greenbrier State Park located?
Greenbrier State Park is in Washington County, MD, at 21843 National Pike, Boonsboro, MD 21713.
Nearby Beaches
Updated · Data from NOAA, NWS