Green Valley, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Green Valley, a community in Frederick County, Maryland.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind around 5 mph.
7-day forecast for Green Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 1 to 5 mph E | 37% |
| Wednesday | 82°F | Rain Showers | 5 mph SE | 75% |
| Wednesday Night | 70°F | Showers And Thunderstorms Likely | 5 mph S | 58% |
| Thursday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph S | 31% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 to 8 mph SW | 35% |
| Friday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 45% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 3 mph SW | 47% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 5 mph W | 43% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 3 mph SW | 43% |
| Sunday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph W | 16% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph SW | 16% |
| Monday | 89°F | Mostly Sunny | 2 to 7 mph W | 14% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Green Valley (39.342, -77.240). Updated through the day.
Growing snapshot for Green Valley
Last spring frost
Apr 14
First fall frost
Oct 29
Growing season
196 days
Hardiness zone
7a
More local growing data for Green Valley: nearby ZIP 21770 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Adamstown
Bagtown
Ballenger Creek
Bartonsville
Braddock Heights
Brunswick
Buckeystown
Burkittsville
Emmitsburg
Frederick
Garretts Mill
Graceham
Jefferson
Lewistown
Libertytown
Linganore
Middletown
Monrovia
Mount Airy
Myersville
New Market
Point of Rocks
Rosemont
Sabillasville
Sandy Hook
Spring Ridge
Thurmont
Union Bridge
Urbana
Walkersville
Climate data from the nearest NOAA station, Damascus 3 Ssw, Md (6 mi from Green Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.