What plant hardiness zone is Saint John

Saint John is located at Lake County, Indiana (IN), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Saint John is 5b by the USDA scale.

Coldest zone's winter temperature is −15 … -10 °F.

Plants of 5b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 5b USDA.

Saint John, Indiana @ wikipedia.