Please give advice on preparing for winter with a young Olive

I recently acquired an olive tree, and I am wondering if you all could give any advice on winterizing. I have read that potted olives do not do well if they fall much below freezing and they should be kept in a cold greenhouse or something similar during the winter months. The problem is, I do not have a greenhouse available to me. Would taking it inside during the few cold stretches we get here in WA be sufficient or should I look for other alternatives?

Additionally, should I be concerned about it receiving too much water from rain now that we are getting our familiar drizzle back?

Thank you for any suggestions,
-James