What plant hardiness zone is Lake Mary Ronan

Lake Mary Ronan is located at Lake County, Montana (MT), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Lake Mary Ronan is 5b by the USDA scale.

Coldest zone's winter temperature is −15 … -10 °F.

Plants of 5b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 5b USDA.

Lake Mary Ronan, Montana @ wikipedia.