What plant hardiness zone is Discovery Bay

Discovery Bay is located at Contra Costa County, California (CA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Discovery Bay is 9b by the USDA scale.

Coldest zone's winter temperature is +25 … +30 °F.

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

Discovery Bay, California @ wikipedia.