What plant hardiness zone is Corwin Springs

Corwin Springs is located at Park County, Montana (MT), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Corwin Springs 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.

Corwin Springs, Montana @ wikipedia.