What plant hardiness zone is Big Arm

Big Arm is located at Lake County, Montana (MT), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Big Arm is 6a by the USDA scale.

Coldest zone's winter temperature is −10 … -5 °F.

Plants of 6a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 6a USDA.

Big Arm, Montana @ wikipedia.