What plant hardiness zone is Thief River Falls

Thief River Falls is located at Pennington County, Minnesota (MN), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Thief River Falls 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.

Thief River Falls, Minnesota @ wikipedia.