What plant hardiness zone is Round Mountain

Round Mountain is located at Shasta County, California (CA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Round Mountain is 9a by the USDA scale.

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

Plants of 9a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 9a USDA.

Round Mountain, California @ wikipedia.