Waiting until the last chance for a bug out, may not be the safest move in certain areas. Can tell you stories I heard from actual native Kalifornians about their SHTF plans. One guy said he would come out of his house, armed to the teeth shooting everyone he could see just to clear a path. Anyone that got close to him when bugging out would be shoot. He had enough weapons to take down police helicopters and was planning to use them. Then of course there was also the other native Kalifornian who stated he would have no problem stealing to support his family. No problem at all. Clearly if you know its coming, best to bug out whilst it is still relatively easy to accomplish. That is the conclusion I came to. And if the bug-out is caused by nuclear radiation or biological contamination, your area might end up under quarantine.
I am going to state generally the bug out plan that I have set up.
One safe spot is with in walking distance. It would be a hike but it can be reached on foot. The another is under a quarter of a tank to drive to get there. Another is slightly over your average tank of gas to reach and still another is over two tanks of gas away. These are not the only ones I have but they serve as examples.
Our place also serves as a safe spot for others. If something hits their area and doesn't hit ours then we will be taking people in. I have supplies and items ready to do that.
Don't just have one plan. You need to have a number of plans depending on what happens. You can't prepare for everything. But you can try. And the act of planing leaves you in better shape to deal with the strange quirks that live just loves to throw at you.