What plant hardiness zone is Silverton

Silverton is located at San Juan County, Colorado (CO), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Silverton 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.