Hardy kiwi (Actinidia argute) need a long growing season (about 150 frost-free days) and when fully dormant, and they have been acclimated to cold slowly, plants can withstand temperatures to about -25 degrees F. Publications listed here provide an overview of hardy kiwi production in the Pacific Northwest.
Production
Growing Kiwi in the Pacific Northwest, Oregon State University 2015.
Hardy Kiwi Production, Cornell University 2015.