Expiration & Storage Tips
When does walnut oil expire?
Unopened bottles of walnut oil can last up to one year in a cool, dark pantry. Once opened, it's best to use the oil within 2 to 3 months. If you've chosen to refrigerate or freeze your walnut oil, you can extend its life to one year. Never keep the oil near heat or light, as it can turn rancid pretty quickly.
How do you tell if walnut oil is bad?
If your walnut oil has gone bad, you'll notice a change in its smell and taste. Instead of a rich, nutty aroma, it will smell sharp or paint-like. The color may change, becoming darker, and the texture might become cloudy or thicker. Rancid oil can also have a bitter or sour taste. Always taste a small bit if you're unsure; if it leaves an unpleasant taste or creates a burning sensation in your throat, it's time to dispose of it.
Tips for storing walnut oil to extend shelf life
• Store in a cool, dark place away from heat and light. These can speed up the oil's oxidation, causing it to turn rancid.
• Once opened, consider refrigerating the oil to extend its shelf life. It'll become cloudy, but will clear up once it returns to room temperature.
• If you use it infrequently, consider freezing the oil in ice cube trays. This way, you can defrost only what you need and keep the rest fresh for longer.
• Always keep the cap secured tightly when not in use. Oxygen contributes to oil oxidation, causing it to become rancid faster.
• Use a clean, dry spoon or pourer when using the oil, to avoid introducing bacteria or moisture into the bottle.