What plant hardiness zone is Saint Johns

Saint Johns is located at Perry County, Illinois (IL), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Saint Johns is 6b by the USDA scale.

Coldest zone's winter temperature is −5 … 0 °F.

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

Saint Johns, Illinois @ wikipedia.