Middlesex County, New Jersey
Local growing conditions for Middlesex County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 36 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:
Avenel 07001
Carteret 07008
Port Reading 07064
Colonia 07067
Sewaren 07077
South Plainfield 07080
Woodbridge 07095
Matawan 07747
Cranbury 08512
Plainsboro Center 08536
Dayton 08810
Milltown 08816
Highland Park 08817
South Plainfield 08820
Kendall Park 08824
Helmetta 08828
Iselin 08830
Whittingham 08831
Keasbey 08832
Keasbey 08837
Metuchen 08840
Middlesex 08846
Milltown 08850
Monmouth Junction 08852
More for New Jersey
- Agriculture in New Jersey
- Frost dates across New Jersey
- 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.