I wouldn’t say “fine”. It would be a year without summer, and the loss of life due to starvation would be rather severe.
No, nations do not have the means to feed their constituents in a nation ending disaster. It's easy to move food from Florida to California in a state sized crises, but the logistics of maintaining a just in case food supply for hundreds of millions distributed around the country? It's a safer bet to assume you'd die in the disaster than to convince people to plan for the future.