The shelf life of olive oil can vary depending on its type and storage conditions. Generally, unopened bottles of olive oil can last between 12 to 24 months. Extra virgin olive oil, in particular, typically maintains its quality for 18 to 24 months if stored correctly. It is essential to check the harvest date when purchasing olive oil, as this indicates how long the oil will remain good. Ideally, you should choose oil that is no more than 12 to 18 months old from the harvest date for optimal freshness (source: Martha Stewart).

Once opened, olive oil begins to degrade due to exposure to air, light, and heat. For the best flavor and health benefits, it is recommended to use opened olive oil within 3 to 6 months. After opening, the oil should ideally be consumed within 30 to 60 days for maximum freshness (source: We Olive, Brightland).

Proper storage is crucial for extending the shelf life of olive oil. Here are some tips to ensure your oil stays fresh:

Olive oil should be stored in a cool, dark place, such as a pantry or cupboard. The ideal temperature is between 60 to 72 degrees Fahrenheit. Avoid storing olive oil near the stove or in direct sunlight, as heat and light can accelerate oxidation, leading to rancidity (source: Food52).

Opt for dark glass or tin containers to protect the oil from light exposure. Avoid clear glass bottles, as they allow light to penetrate and degrade the oil's quality. If you buy olive oil in bulk, consider decanting it into smaller bottles to minimize exposure each time you open the main container (source: Brightland).

Always ensure that the bottle is tightly sealed when not in use. Air exposure can lead to oxidation, which negatively impacts the oil's flavor and quality (source: Martha Stewart).

While olive oil does not "go bad" in the traditional sense, it can become rancid. Here are some signs to look for:

Smell: Fresh olive oil has a fruity, herbaceous aroma. If it smells waxy or similar to crayons, it has likely gone bad (source: Brightland).

Taste: Rancid olive oil will taste bitter, sour, or stale, lacking the sharp, peppery flavor of fresh oil (source: Martha Stewart).

Appearance: While not a definitive indicator, if olive oil appears cloudy or has sediment, it may be past its prime, especially if stored in the refrigerator (source: Brightland).

Olive oil is a perishable product that requires proper storage to maintain its quality and flavor. Unopened, it can last between 12 to 24 months, while opened bottles should be consumed within 3 to 6 months for the best taste and health benefits. Always store olive oil in a cool, dark place, and be vigilant about its smell and taste to ensure you're using a fresh product. By following these guidelines, you can enjoy the full benefits of olive oil in your cooking and health regimen.