Not sure there will be anyplace to bug out to. My concern would be Yellowstone with pumice (ash) coming down cloging roads, taking out the power grid and cloging car engines and collapsing roofs and blocking doorways and any travel paths. Not sure how we could survive that large a disaster. Not to mention that any rain coming down would have a high sulfuric acid content.
Good luck to us all.
That reminds me I need to re-watch the movie 2012, I loved Woody Herraldson in that.