Answer: You can transplant it outdoors anytime after the weather warms in the spring. In fact it would probably like very much to be outside! Avocado trees love full sun, but will grow in part shade. Trees grown from supermarket avocados will not be very cold tolerant and might need winter protection if your weather stays below freezing. A mild frost shouldn't hurt it though, especially after it's been in the ground for a few years. If you do get prolonged cold weather, you could prune your tree back in the fall and try to cover the plant for protection, but the trees get very tall, making this impractical. Even a covered tree will need a heat source when temps drop into the mid 20's. As a novelty ornamental it has possibilities, but don't grow one in hopes of getting fruit. This takes years of freeze-free growing.
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