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
84°F
Mostly Sunny
Mostly sunny, with a high near 84. North wind around 10 mph.
7-day forecast for Great Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Mostly Sunny | 10 mph N | 10% |
| Tonight | 61°F | Mostly Cloudy | 9 mph N | 10% |
| Saturday | 78°F | Partly Sunny | 8 mph E | 5% |
| Saturday Night | 67°F | Mostly Cloudy then Isolated Rain Showers | 8 mph SE | 20% |
| Sunday | 83°F | Chance Rain Showers | 7 to 13 mph S | 51% |
| Sunday Night | 65°F | Showers And Thunderstorms Likely | 3 to 9 mph NW | 66% |
| Monday | 74°F | Chance Rain Showers | 7 to 12 mph NE | 41% |
| Monday Night | 61°F | Rain Showers Likely | 7 to 10 mph NE | 56% |
| Tuesday | 66°F | Rain Showers Likely | 12 mph NE | 59% |
| Tuesday Night | 56°F | Rain Showers Likely | 12 mph NE | 59% |
| Wednesday | 62°F | Chance Rain Showers | 13 mph NE | 52% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 50% |
| Thursday | 63°F | Chance Showers And Thunderstorms | 12 mph NE | 49% |
| Thursday Night | 54°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 35% |
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
Nearby towns & communities
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Braddock
Bull Run
Burke
Burke Centre
Centreville
Chantilly
Clifton
Crosspointe
Difficult Run
Dranesville
Dunn Loring
Fair Lakes
Fair Oaks
Fairfax
Fairfax Station
Floris
Fort Belvoir
Fort Hunt
Franconia
Franklin Farm
George Mason
Great Falls Crossing
Greenbriar
Groveton
Hayfield
Herndon
Huntington
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 Sep 18, 2026.