What plant hardiness zone is Onawa

Onawa is located at Monona County, Iowa (IA), USA.

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

Onawa, Iowa @ wikipedia.