Great Falls, VA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Great Falls, a community in Fairfax County, Virginia.
This Afternoon
71°F
Sunny
Sunny, with a high near 71. South wind around 7 mph.
7-day forecast for Great Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Sunny | 7 mph S | 2% |
| Tonight | 52°F | Mostly Clear | 6 mph S | 2% |
| Wednesday | 74°F | Mostly Sunny | 3 to 10 mph S | 2% |
| Wednesday Night | 62°F | Mostly Cloudy then Chance Light Rain | 8 mph S | 47% |
| Thursday | 75°F | Chance Light Rain | 10 mph S | 44% |
| Thursday Night | 61°F | Chance Light Rain | 2 to 7 mph SW | 50% |
| Friday | 70°F | Rain Likely | 5 mph NW | 62% |
| Friday Night | 50°F | Light Rain Likely then Mostly Cloudy | 2 to 7 mph NW | 62% |
| Saturday | 64°F | Mostly Sunny | 7 to 12 mph NW | 9% |
| Saturday Night | 43°F | Partly Cloudy | 8 mph NW | 9% |
| Sunday | 61°F | Mostly Sunny | 8 mph NW | 6% |
| Sunday Night | 42°F | Partly Cloudy | 3 to 7 mph NW | 14% |
| Monday | 61°F | Mostly Sunny | 8 to 13 mph NW | 14% |
| Monday Night | 40°F | Mostly Clear | 2 to 7 mph W | 8% |
Forecast source: National Weather Service (api.weather.gov) for Great Falls (39.012, -77.302). Updated through the day.
Growing snapshot for Great Falls
Last spring frost
Apr 14
First fall frost
Oct 29
Growing season
198 days
Hardiness zone
7b
More local growing data for Great Falls: nearby ZIP 22066 weather · frost dates · planting calendar · Virginia frost dates
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Climate data from the nearest NOAA station, Vienna, Va (8.3 mi from Great Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.