What plant hardiness zone is Zortman

Zortman is located at Phillips County, Montana (MT), USA.

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