A farmer 5 days after Zday would likely have a gun or 6.
Im trying to imagine the kind of person who would reasonably try to wait it out at a farm and farm up. And how they would react to new people, groups, and attmepts to trade, sneak around, or loot him.
What skills does he have? Would he accept an offer at farmhanding? would he train you? would he feed you? would he let you stay a night?
How would he defend himself? Would he be ther because he likes to farm, wants to stay at his/this home, or is pretecting something, like his fams?