Mount Briar, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Briar, a community in Washington County, Maryland.
Tonight
58°F
Partly Cloudy
Partly cloudy, with a low around 58. Northeast wind around 7 mph.
7-day forecast for Mount Briar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Partly Cloudy | 7 mph NE | 2% |
| Saturday | 77°F | Partly Sunny | 5 to 9 mph E | 5% |
| Saturday Night | 66°F | Mostly Cloudy then Scattered Rain Showers | 8 mph SE | 30% |
| Sunday | 81°F | Showers And Thunderstorms | 8 to 13 mph S | 76% |
| Sunday Night | 63°F | Showers And Thunderstorms | 5 to 9 mph NW | 76% |
| Monday | 71°F | Chance Rain Showers | 7 to 12 mph NE | 40% |
| Monday Night | 59°F | Rain Showers Likely | 6 to 12 mph NE | 60% |
| Tuesday | 63°F | Rain Showers Likely | 13 mph NE | 74% |
| Tuesday Night | 53°F | Showers And Thunderstorms Likely | 10 to 14 mph NE | 74% |
| Wednesday | 59°F | Rain Showers Likely | 10 to 14 mph NE | 57% |
| Wednesday Night | 53°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 54% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 52% |
| Thursday Night | 53°F | Chance Rain Showers | 7 mph N | 35% |
| Friday | 67°F | Slight Chance Rain Showers | 9 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov) for Mount Briar (39.443, -77.687). Updated through the day.
Growing snapshot for Mount Briar
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
175 days
Hardiness zone
7a
More local growing data for Mount Briar: nearby ZIP 21756 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Sharpsburg 5 S, Md (4.5 mi from Mount Briar). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.