What plant hardiness zone is Rock Valley

Rock Valley is located at Sioux County, Iowa (IA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Rock Valley 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.