What plant hardiness zone is Calmar

Calmar is located at Winneshiek County, Iowa (IA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Calmar is 4b by the USDA scale.

Coldest zone's winter temperature is −25 … -20 °F.

Plants of 4b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 4b USDA.

Calmar, Iowa @ wikipedia.