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I think in a non tropical climate it is unlikely. In good conditions they take 7 years to bear fruit and starting one from seed is unlikely to produce a good fruit. Pretty much all avocados that we eat are Hass avocados and they are all clones of the same tree.

I can buy the fruit from the store, I just like the way the tree looks, though mine is still a baby. I gave one to my mom over a year ago and it's taller than me!