What plant hardiness zone is Willow River

Willow River is located at Pine County, Minnesota (MN), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Willow River is 3b by the USDA scale.

Coldest zone's winter temperature is −35 … -30 °F.

Plants of 3b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 3b USDA.

Willow River, Minnesota @ wikipedia.