Middlesex County, Connecticut
Local growing conditions for Middlesex County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 23 ZIP codes in our data.
Hardiness zones in Middlesex County
Middlesex County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Middlesex County for its live forecast, frost dates, and planting calendar:
Deep River Center 06409
Chester Center 06412
Clinton 06413
Lake Pocotopaug 06414
Middletown 06416
Deep River Center 06417
Chester Center 06419
Durham 06422
Moodus 06423
East Hampton 06424
Essex Village 06426
Higganum 06438
Higganum 06441
Deep River Center 06442
Meriden 06455
Middletown 06456
Middletown 06457
Middletown 06459
Moodus 06469
Old Saybrook Center 06475
Portland 06480
Middletown 06481
Westbrook Center 06498
More for Connecticut
- Agriculture in Connecticut
- Frost dates across Connecticut
- 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.