82°
Sunny
0%
85
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
Ideal for a beach walk.
82°F air
Full NWS forecast for This Afternoon
Sunny, with a high near 82. North wind around 6 mph.
Tonight
Clear, with a low around 59. North wind 1 to 5 mph.
Weather
- 82°F air — ideal beach weather
- Sunny skies — clear conditions
85 /100
ideal
85 Sunbathe
88 Walk
73 Fish
80 Photo
Best for walking today
Atmosphere
Air Temp
82°F
Clear
Wind
6 mph
N
Rain
0%
This Afternoon
UV Peak
8 Very High
High 11 AM–03 PM · burn in ~25m
Burn-free before 09 AM & after 05 PM
Tomorrow
88°F
Sunny
Water
Water Temp
—
Next High Tide
9:51 PM
1.1 ft · in 29m
Water Quality
Clean
6 MPN/100mL · E. coli
USGS · sampled 9mo ago
Sun & Moon
Sunrise
5:44 AM
Sunset
8:32 PM
Moon · 88%
Waning Gibbous
Neap tides — smaller range
Today's Tides
7-day chart →| Time | Type | Height |
|---|---|---|
| 2:39 AM | Low | 0.5 ft |
| 9:24 AM | High | 1.8 ft |
| 4:51 PM | Low | 0.5 ft |
| 9:51 PM | High | 1.1 ft |
7-Day Beach Day Forecast
88°
Sunny
0%
85
91°
Mostly Sunny
0%
76
92°
Mostly Sunny
8%
75
85°
Chance Showers And Thunderstorms
46%
38
78°
Slight Chance Rain Showers
18%
79
79°
Slight Chance Rain Showers then Mostly Sunny
15%
84
What to Bring Today
- critical SPF 50 sunscreen UV index 8 — very high
- recommended Umbrella or shade warm day, light wind
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.
Minor
10:30 PM - 11:30 PM
Major
2:30 AM - 4:30 AM
Minor
7:40 AM - 8:40 AM
Major
2:50 PM - 4:50 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
7-Day Tide Chart →
Full high/low predictions for the next week at Greenbrier State Park.
7-Day Weather →
Extended forecast for Greenbrier State Park from the National Weather Service.
Frequently Asked
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