Union County, South Carolina

Local growing conditions for Union County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 4 ZIP codes in our data.

Hardiness zones in Union County

Union County spans these USDA plant hardiness zones (by number of ZIP codes):

Local weather & frost dates

Open any community in Union County for its live forecast, frost dates, and planting calendar:

More for South Carolina

• Agriculture in South Carolina
• Frost dates across South Carolina
• USDA hardiness zones explained
• Planting calendar by ZIP code

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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.