What plant hardiness zone is Glen Ullin

Glen Ullin is located at Morton County, North Dakota (ND), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Glen Ullin 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.

Glen Ullin, North Dakota @ wikipedia.