What plant hardiness zone is Portsmouth

Portsmouth is located at Newport County, Rhode Island (RI), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Portsmouth is 7a by the USDA scale.

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

Plants of 7a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 7a USDA.

Portsmouth, Rhode Island @ wikipedia.