Union County, Arkansas
Local growing conditions for Union County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 8 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:
Calion 71724
El Dorado 71730
Huttig 71747
Junction City 71749
Mount Holly 71758
Norphlet 71759
Smackover 71762
Strong 71765
More for Arkansas
- Agriculture in Arkansas
- Frost dates across Arkansas
- 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.