What plant hardiness zone is Mill Plain

Mill Plain is located at Clark County, Washington (WA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Mill Plain 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.

Mill Plain, Washington @ wikipedia.