This is really a Mediterranean plant and won't survive outside in our climate, even with winters supposedly getting warmer through global warming, so you should definitely bring in indoors now as the evenings are getting chilly. If you don't have a greenhouse and don't have the space indoors, you could try putting a really heavy duty clear plastic bag lined with some bubblewrap over the whole plant and tieing it round the pot to anchor it, and then moving the plant to the most sheltered part of the garden. I don't know whether this would save it, but if we have a mild winter it could be worth a try.