What plant hardiness zone is Iron Mountain

Iron Mountain is located at Dickinson County, Michigan (MI), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Iron Mountain is 4a by the USDA scale.

Coldest zone's winter temperature is −30 … -25 °F.

Plants of 4a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 4a USDA.