Garretts Mill, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Garretts Mill, a community in Frederick County, Maryland.
Tonight
58°F
Isolated Rain Showers then Mostly Cloudy
Isolated rain showers before 8pm. Mostly cloudy, with a low around 58. North wind 6 to 9 mph. Chance of precipitation is 20%.
7-day forecast for Garretts Mill
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Isolated Rain Showers then Mostly Cloudy | 6 to 9 mph N | 20% |
| Saturday | 77°F | Partly Sunny | 8 mph NE | 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 | 75% |
| Sunday Night | 63°F | Showers And Thunderstorms | 3 to 9 mph NW | 75% |
| Monday | 71°F | Chance Rain Showers | 7 to 12 mph NE | 40% |
| Monday Night | 59°F | Rain Showers Likely | 6 to 12 mph NE | 61% |
| Tuesday | 63°F | Rain Showers Likely | 12 mph NE | 73% |
| Tuesday Night | 54°F | Showers And Thunderstorms Likely | 13 mph NE | 73% |
| Wednesday | 59°F | Rain Showers Likely | 9 to 13 mph NE | 57% |
| Wednesday Night | 54°F | Showers And Thunderstorms Likely | 7 to 13 mph NE | 55% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 53% |
| 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 Garretts Mill (39.353, -77.689). Updated through the day.
Growing snapshot for Garretts Mill
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
175 days
Hardiness zone
7a
More local growing data for Garretts Mill: nearby ZIP 21758 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Adamstown
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Bartonsville
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Jefferson
Lewistown
Libertytown
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Middletown
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Point of Rocks
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Thurmont
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Urbana
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Climate data from the nearest NOAA station, Sharpsburg 5 S, Md (4.6 mi from Garretts Mill). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.