What plant hardiness zone is Mount Wilson

Mount Wilson is located at Los Angeles County, California (CA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Mount Wilson 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.