What plant hardiness zone is Castro Valley

Castro Valley is located at Alameda County, California (CA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Castro Valley is 10a by the USDA scale.

Coldest zone's winter temperature is +30 … +35 °F.

Plants of 10a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 10a USDA.