New London County, Connecticut
Local growing conditions for New London County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 33 ZIP codes in our data.
Hardiness zones in New London County
New London County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in New London County for its live forecast, frost dates, and planting calendar:
Long Hill 06340
Norwich 06360
South Windham 06249
Baltic 06254
New London 06320
Baltic 06330
Niantic 06333
Norwich 06334
Gales Ferry 06335
Norwich 06336
Mashantucket 06338
Mashantucket 06339
Baltic 06350
Jewett City 06351
Oxoboxo River 06353
Mystic 06355
Niantic 06357
Hopkinton 06359
Norwich 06365
Oxoboxo River 06370
Essex Village 06371
Oxoboxo River 06375
Niantic 06376
Mystic 06378
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.