What plant hardiness zone is Walnut Hill

Walnut Hill is located at Marion County, Illinois (IL), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Walnut Hill is 6a by the USDA scale.

Coldest zone's winter temperature is −10 … -5 °F.

Plants of 6a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 6a USDA.