What plant hardiness zone is Standard City

Standard City is located at Macoupin County, Illinois (IL), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Standard City 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.