Jarrettsville, MD Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Jarrettsville, a community in Harford County, Maryland.

Today

72°F

Patchy Fog then Mostly Sunny

Patchy fog before 9am. Mostly sunny. High near 72, with temperatures falling to around 66 in the afternoon. South wind 5 to 9 mph, with gusts as high as 18 mph.

7-day forecast for Jarrettsville

When	Temp	Forecast	Wind	Precip
Today	72°F	Patchy Fog then Mostly Sunny	5 to 9 mph S	1%
Tonight	60°F	Mostly Cloudy then Chance Rain Showers	9 mph S	26%
Thursday	71°F	Rain Showers Likely	7 to 10 mph S	59%
Thursday Night	60°F	Rain Showers Likely	2 to 7 mph SW	62%
Friday	68°F	Light Rain Likely	3 mph N	62%
Friday Night	49°F	Chance Light Rain then Partly Cloudy	2 to 8 mph NW	39%
Saturday	62°F	Mostly Sunny	9 to 13 mph NW	7%
Saturday Night	42°F	Partly Cloudy	13 mph NW	7%
Sunday	59°F	Mostly Sunny	8 to 13 mph NW	3%
Sunday Night	41°F	Mostly Clear	9 mph W	4%
Monday	58°F	Sunny	9 to 15 mph W	4%
Monday Night	39°F	Mostly Clear	5 to 9 mph W	4%
Tuesday	63°F	Sunny	7 to 12 mph W	1%
Tuesday Night	40°F	Mostly Clear	8 mph W	0%

Forecast source: National Weather Service (api.weather.gov) for Jarrettsville (39.601, -76.472). Updated through the day.

Growing snapshot for Jarrettsville

Last spring frost

Apr 3

First fall frost

Nov 6

Growing season

217 days

Hardiness zone

More local growing data for Jarrettsville: nearby ZIP 21084 weather · frost dates · planting calendar · Maryland frost dates

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All Maryland locations ›

Climate data from the nearest NOAA station, Conowingo Dam, Md (15.8 mi from Jarrettsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.