What plant hardiness zone is Chain of Rocks

Chain of Rocks is located at Lincoln County, Missouri (MO), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Chain of Rocks 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.

Chain of Rocks, Missouri @ wikipedia.