What plant hardiness zone is Lake Saint Louis

Lake Saint Louis is located at Saint Charles County, Missouri (MO), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Lake Saint Louis 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.