|Duck and Cover, bro|
While I'm not quite old enough to remember Duck-and-Cover drills in school, I do remember hearing that because of its port facilities, my home town was #7 on the Russkies' hit list. I don't know if that was true or even how the good folks of Duluth managed to get a copy of the USSR playbook,* but the bombs have to fall somewhere, and it's likely that they'll fall where they'll do the Russians the most good, or at least do us the most harm.
One advantage of modern technology is that nuclear bombs are a lot cleaner now that they were when Fat Man and Little Boy toured Japan in 1945. While they are more powerful, they will likely dissipate more quickly and do less damage to stuff outside the immediate blast zone. Unless they hit a nuclear power plant, then hooo, buddy. But as Joel Skoussen once said, if you're in a blast zone, don't build a better bomb shelter, move!
That's really the only plan for threats this catastrophic. You either ignore them or you get out of their way. If you don't think the Chinese are going to bomb out our silos in a first strike and you like western Nebraska, you're probably fine to live there. If you think they might and the idea of building a bigger bomb shelter keeps you awake at night, well, there are lots of other places that look like western Nebraska that don't have targets all over the place.
I do note on this map that, other than the three rural areas saturated with black, bomb targets are basically population centers because those are usually industrial centers. While I'm skeptical that the Russians will start a surprise bombing campaign in all these cities simultaneously - meaning you'll have time to escape most of them - there remain plenty of other reasons to avoid high population areas.
* Even this map is not necessarily from that playbook.