Grantsville, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantsville, a town in Garrett County, Maryland.
Today
79°F
Mostly Sunny
Mostly sunny, with a high near 79. Southeast wind around 6 mph.
7-day forecast for Grantsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Mostly Sunny | 6 mph SE | 0% |
| Tonight | 63°F | Mostly Cloudy | 2 to 7 mph SE | 4% |
| Wednesday | 79°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph SE | 54% |
| Wednesday Night | 65°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 mph S | 57% |
| Thursday | 80°F | Showers And Thunderstorms | 2 to 6 mph SW | 85% |
| Thursday Night | 66°F | Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 3 mph SW | 85% |
| Friday | 80°F | Showers And Thunderstorms | 6 mph SW | 79% |
| Friday Night | 64°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph W | 79% |
| Saturday | 79°F | Chance Showers And Thunderstorms | 5 to 8 mph W | 44% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 6 mph W | 44% |
| Sunday | 81°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph W | 22% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 9 mph W | 22% |
| Monday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 12 mph W | 21% |
| Monday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph W | 32% |
Forecast source: National Weather Service (api.weather.gov) for Grantsville (39.697, -79.153). Updated through the day.
Growing snapshot for Grantsville
Last spring frost
Apr 29
First fall frost
Oct 20
Growing season
174 days
Hardiness zone
6a
More local growing data for Grantsville: nearby ZIP 21536 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Savage Rvr Dam, Md (10.2 mi from Grantsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.