What plant hardiness zone is Coulee Dam

Coulee Dam is located at Okanogan County, Washington (WA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Coulee Dam is 6b by the USDA scale.

Coldest zone's winter temperature is −5 … 0 °F.

Plants of 6b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 6b USDA.

Coulee Dam, Washington @ wikipedia.