The culinary ginger plant is probably safe to grow outside in your area if you are in 8b-9 Climate Zone. If you are unsure, plant the rhizome/plant close to your house as you can. I have grown White Butterfly Ginger in pots outside my home in Seattle, WA (Zone 8-8b), and left them outside over the winter and they survived. The leaves would wilt after severely low temps but produce new leaves in the Spring. I haven't had time to do much planting in the last several years, but that was one plant that I've started indoors and planned to plant outside but never got to do it. I start them from left over ginger root pieces that have sprouted on the shelf by dipping it in a rooting medium and placing them in a small jar with 1/4 inch of water. When the leaves are 4-6 inches long, I move them in a gallon pot with regular potting soil in a well lit area of the house. If you plant them in a bigger pot, use a wide shallow pot in well draining soil. If you want to leave them outside or plant them in the ground, plant them as close to the house as possible in the warmest side of your house. Here is a link to some information on growing ginger:
https://www.easytogrowbulbs.com/page...planting-guide
Hope this helps.
Chong