What plant hardiness zone is Great Falls

Great Falls is located at Cascade County, Montana (MT), USA.

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

Great Falls, Montana @ wikipedia.