Hartford County, Connecticut
Local growing conditions for Hartford County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 60 ZIP codes in our data.
Hardiness zones in Hartford County
Hartford County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Hartford County for its live forecast, frost dates, and planting calendar:
Windsor Locks 06096
Hartford 06114
Collinsville 06001
Blue Hills 06002
Bristol 06010
Bristol 06013
Broad Brook 06016
Canton Valley 06019
Canton Valley 06020
New Hartford Center 06022
Middletown 06023
Tariffville 06026
North Granby 06027
Bristol 06032
Glastonbury Center 06033
Salmon Brook 06035
Kensington 06037
Manchester 06040
Manchester 06042
New Britain 06051
New Britain 06052
New Britain 06053
West Simsbury 06059
North Granby 06060
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.