New Castle County, Delaware
Local growing conditions for New Castle County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 29 ZIP codes in our data.
Hardiness zones in New Castle County
New Castle County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in New Castle County for its live forecast, frost dates, and planting calendar:
Glasgow 19702
Claymont 19703
Greenville 19710
Newark 19711
Brookside 19713
Newark 19716
Newark 19717
New Castle 19720
Greenville 19732
Wilmington 19801
Wilmington 19802
Wilmington 19803
Newport 19804
Elsmere 19805
Wilmington 19806
Edgemoor 19809
Glasgow 19701
Delaware City 19706
Hockessin 19707
Middletown 19709
Odessa 19730
Port Penn 19731
St. Georges 19733
Townsend 19734
More for Delaware
- Agriculture in Delaware
- Frost dates across Delaware
- 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.