What plant hardiness zone is Warm Springs

Warm Springs is located at Deer Lodge County, Montana (MT), USA.

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

Warm Springs, Montana @ wikipedia.