What plant hardiness zone is Irwin
Irwin is located at Lancaster County, South Carolina (SC), USA.
Plant hardiness zone (winter frost zone or gardening zone) for Irwin is 8a by the USDA scale.
Coldest zone's winter temperature is +10 … +15 °F.
Plants of 8a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 8a USDA.
Irwin, South Carolina @ wikipedia.