What plant hardiness zone is Fort Benton

Fort Benton is located at Chouteau County, Montana (MT), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Fort Benton 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.

Fort Benton, Montana @ wikipedia.