What plant hardiness zone is Cathedral

Cathedral is located at Hinsdale County, Colorado (CO), USA.

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

Cathedral, Colorado @ wikipedia.