What plant hardiness zone is Fort Pierre

Fort Pierre is located at Stanley County, South Dakota (SD), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Fort Pierre is 4b by the USDA scale.

Coldest zone's winter temperature is −25 … -20 °F.

Plants of 4b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 4b USDA.

Fort Pierre, South Dakota @ wikipedia.