What plant hardiness zone is National City (National Stock Yards)

National City (National Stock Yards) is located at St. Clair County, Illinois (IL), USA.

Plant hardiness zone (winter frost zone or gardening zone) for National City (National Stock Yards) 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.