My aunt has an avocado tree. Freshly-picked avocados ripen very differently than store-bought ones. They stay ripe for way longer, since they don't have to be picked in advance and shipped. And I say this as someone who lives in CA, where we get produce on the fresher side, in general.

When I visited my aunt she gave us several avocados, and I thought, "we're never going to be able to eat these before they go bad". I was so wrong — they stayed perfect for well over a week.