What plant hardiness zone is Rockwell City

Rockwell City is located at Calhoun County, Iowa (IA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Rockwell 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.