2 - 3 weeks ago was at an avocado farm/plantation in Korat province. The owner is growing lovely avocados which he sells mainly at the gate or online. He uses a hybrid (correct word when talking about a plant which is a mix of two plants?). So, I think yes, it's possible, however, cultivars like Hass don't seem to like it here in our neck of the woods, so you're going to have to find a tree that can grow in this climate. From what I can tell, avocados don't seem to be too fussy when it comes to soil type, but they don't like having wet feet.