Green Valley, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Green Valley, a community in Frederick County, Maryland.
Overnight
57°F
Partly Cloudy
Partly cloudy, with a low around 57. Northeast wind around 9 mph.
7-day forecast for Green Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Partly Cloudy | 9 mph NE | 2% |
| Saturday | 76°F | Partly Sunny | 9 mph E | 5% |
| Saturday Night | 65°F | Mostly Cloudy then Scattered Rain Showers | 9 mph SE | 30% |
| Sunday | 79°F | Rain Showers Likely | 9 to 14 mph S | 66% |
| Sunday Night | 63°F | Showers And Thunderstorms Likely | 3 to 10 mph NW | 69% |
| Monday | 70°F | Chance Rain Showers | 8 to 13 mph NE | 40% |
| Monday Night | 58°F | Chance Rain Showers | 7 to 12 mph NE | 54% |
| Tuesday | 62°F | Rain Showers Likely | 13 mph NE | 61% |
| Tuesday Night | 53°F | Rain Showers Likely | 14 mph NE | 61% |
| Wednesday | 59°F | Chance Rain Showers | 14 mph NE | 54% |
| Wednesday Night | 53°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 51% |
| Thursday | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 48% |
| Thursday Night | 53°F | Chance Showers And Thunderstorms | 3 to 8 mph N | 36% |
| Friday | 66°F | Slight Chance Rain Showers | 9 mph N | 22% |
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 Sep 19, 2026.