Wintering potted blueberry bush
If you leave it alone outside, it will die. Plants in pots cannot survive the winter outdoors. Here are some options.
If you have a place in your yard where you can sink the pot into the ground, do that now. The surrounding earth will insulate the pot.
If you have a space (garage?) that doesn't get too cold (say, below 25 degrees), you could move the pot there for the winter.
Or you could rig something around the pot (chicken wire?) and fill the space with something insulating (straw?).
None of these is foolproof, although the first suggestion is the best.
Check this article (from Chicago, so warmer climate):