New Haven County, Connecticut
Local growing conditions for New Haven County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 41 ZIP codes in our data.
Hardiness zones in New Haven County
New Haven County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in New Haven County for its live forecast, frost dates, and planting calendar:
Ansonia 06401
Derby 06418
East Haven 06512
Quinnipiac University 06518
Naugatuck 06403
Branford Center 06405
Cheshire Village 06410
Guilford Center 06437
Madison Center 06443
Meriden 06450
Meriden 06451
Milford city (balance) 06460
Milford city (balance) 06461
Northford 06471
Northford 06472
North Haven 06473
Orange 06477
Sandy Hook 06478
Ansonia 06483
Heritage Village 06488
Wallingford Center 06492
New Haven 06510
New Haven 06511
New Haven 06513
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.