What plant hardiness zone is Heart Butte

Heart Butte is located at Pondera County, Montana (MT), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Heart Butte 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.