Answer: Some varieties of lavender are hardier than others, so it depends which kind you have. "Munstead" and "Hidcote" are among the hardiest. They hate wet feet particularly in winter and will have the best chance of overwintering in a well drained soil. Assuming you can protect the plant from wind, the roots should be okay because they will be insulated in the soil. You can mound some organic matter over the entire plant to further protect it and it will have a better chance of surviving outdoors. It is difficult to overwinter lavender indoors because it needs very bright light to grow well and stay healthy. If you have to bring it indoors, try to keep it in as bright and cool a location as possible. Best wishes with your garden!
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