What plant hardiness zone is Rapid City
Rapid City is located at Kalkaska County, Michigan (MI), USA.
Plant hardiness zone (winter frost zone or gardening zone) for Rapid City is 5a by the USDA scale.
Coldest zone's winter temperature is −20 … -15 °F.
Plants of 5a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 5a USDA.
Rapid City, Michigan @ wikipedia.