Antietam, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Antietam, a community in Washington County, Maryland.
Tonight
51°F
Mostly Clear
Mostly clear, with a low around 51. Southeast wind around 5 mph.
7-day forecast for Antietam
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Clear | 5 mph SE | 1% |
| Wednesday | 75°F | Mostly Sunny | 5 to 14 mph S | 2% |
| Wednesday Night | 63°F | Mostly Cloudy then Light Rain | 7 to 10 mph S | 86% |
| Thursday | 76°F | Light Rain | 5 to 10 mph S | 76% |
| Thursday Night | 59°F | Chance Light Rain | 0 to 5 mph NW | 49% |
| Friday | 70°F | Chance Light Rain | 2 mph NW | 49% |
| Friday Night | 47°F | Chance Light Rain then Partly Cloudy | 3 mph NW | 42% |
| Saturday | 64°F | Mostly Sunny | 3 to 12 mph NW | 11% |
| Saturday Night | 38°F | Partly Cloudy | 3 to 8 mph NW | 11% |
| Sunday | 61°F | Mostly Sunny | 3 to 8 mph W | 6% |
| Sunday Night | 36°F | Partly Cloudy then Slight Chance Light Rain | 7 mph W | 20% |
| Monday | 61°F | Slight Chance Light Rain | 7 to 15 mph W | 22% |
| Monday Night | 35°F | Slight Chance Light Rain | 3 to 7 mph W | 22% |
| Tuesday | 65°F | Mostly Sunny | 5 to 14 mph W | 9% |
Forecast source: National Weather Service (api.weather.gov) for Antietam (39.415, -77.736). Updated through the day.
Growing snapshot for Antietam
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
175 days
Hardiness zone
7a
More local growing data for Antietam: nearby ZIP 21782 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 Antietam). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.