Loudoun County, Virginia
Local growing conditions for Loudoun County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 17 ZIP codes in our data.
Hardiness zones in Loudoun County
Loudoun County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Loudoun County for its live forecast, frost dates, and planting calendar:
Stone Ridge 20105
Middleburg 20117
Waterford 20129
Purcellville 20132
Round Hill 20141
Ashburn 20147
Brambleton 20148
South Riding 20152
Hamilton 20158
Sterling 20164
Cascades 20165
Ashburn 20166
Leesburg 20175
Leesburg 20176
Lovettsville 20180
Upperville 20184
Waterford 20197
More for Virginia
- Agriculture in Virginia
- Frost dates across Virginia
- USDA hardiness zones explained
- Planting calendar by ZIP code
County growing conditions are compiled from our ZIP-code database, USDA hardiness-zone data, and NOAA climate normals. Conditions vary within a county by elevation and local microclimate. Page updated Aug 4, 2026.