What plant hardiness zone is Lake Oswego

Lake Oswego is located at Clackamas County, Oregon (OR), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Lake Oswego 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.

Lake Oswego, Oregon @ wikipedia.