Harford County, Maryland
Local growing conditions for Harford County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 20 ZIP codes in our data.
Hardiness zones in Harford County
Harford County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Harford County for its live forecast, frost dates, and planting calendar:
Perryman 21130
Aberdeen 21001
Aberdeen Proving Ground 21005
Bel Air South 21009
Edgewood 21010
Bel Air 21014
Bel Air South 21015
Riverside 21017
Bel Air South 21028
Darlington 21034
Edgewood 21040
Fallston 21047
Bel Air North 21050
Havre de Grace 21078
Jarrettsville 21084
Joppatowne 21085
Pylesville 21132
Pylesville 21154
Delta 21160
Jarrettsville 21161
More for Maryland
- Agriculture in Maryland
- Frost dates across Maryland
- 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.