What plant hardiness zone is Grass Valley

Grass Valley is located at Nevada County, California (CA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Grass Valley 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.

Grass Valley, California @ wikipedia.