What plant hardiness zone is Breckenridge Hills

Breckenridge Hills is located at Saint Louis County, Missouri (MO), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Breckenridge Hills 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.

Breckenridge Hills, Missouri @ wikipedia.