What plant hardiness zone is Twin Bridges

Twin Bridges is located at Madison County, Montana (MT), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Twin Bridges is 4b by the USDA scale.

Coldest zone's winter temperature is −25 … -20 °F.

Plants of 4b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 4b USDA.

Twin Bridges, Montana @ wikipedia.