If you occasionally get freezing temperatures where you live, your avocados won't survive in the ground outdoors. You can transplant them into larger containers and continue to overwinter them indoors. Avocados grown from seed take 5-13 years to produce fruit and may never do so in a container indoors. Another option would be to enjoy your trees as ornamentals and purchase a Don Gillogly avocado, also known as the indoor fruiting avocado tree. If it receives bright light and proper care, it reliably bears fruit twice a year and is smaller-growing than its counterparts.