What plant hardiness zone is Walnut Grove

Walnut Grove is located at Clark County, Washington (WA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Walnut Grove is 8b by the USDA scale.

Coldest zone's winter temperature is +15 … +20 °F.

Plants of 8b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 8b USDA.

Walnut Grove, Washington @ wikipedia.