What plant hardiness zone is Frontier

Frontier is located at Lincoln County, Wyoming (WY), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Frontier 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.

Frontier, Wyoming @ wikipedia.