- How long does walnut oil last once opened? The precise answer depends to a large extent on storage conditions - to maximize the shelf life of opened walnut oil, refrigerate after opening.
How long does an opened bottle of walnut oil last in the refrigerator? Opened walnut oil will usually keep for about 8 months when stored in the refrigerator.
Refrigeration may cause the walnut oil to become cloudy and solidify, but this will not affect the quality or flavor — once the oil is brought back to room temperature, it will return to its normal consistency and color.
Is an opened bottle of walnut oil safe after the Use By or Best By date? Yes: "Best By," "Best if Used By," and "Use By" dates on commercially packaged foods sold in the United States represent the manufacturer's estimate of how long the product will remain at peak quality - in most cases, the opened bottle of walnut oil will still be safe to consume after that date, as long as it has been stored properly.
How can you tell if an opened bottle of walnut oil has gone bad? To determine if oil is still suitable for use, smell and taste it: If the oil has developed an off odor, flavor or appearance, it should be discarded for quality purposes.
Sources: For details about data sources used for food storage information, please click here