Essential oils need to be stored in a cool place away from heat and light to prevent oxidation. If you live in a very warm climate you can store your essential oils in the fridge.
Essential oils do not expire. However, they have a limited shelf life depending on their exposition to light, heat and oxygen. These can impact the shelf life of essential oils. The best way to preserve the quality and integrity of your essential oils is by storing them in a box away from sunlight, avoid heat and make sure you always screw on the lid properly so as to avoid oxidation with oxygen. We have a great video explaining the storage and expiration of your essential oils here.