Apple cider vinegar lasts essentially indefinitely. Its high acidity makes it self-preserving, so it won’t spoil or become unsafe to consume even years after you buy it. That said, quality does change over time, and an opened bottle is best used within about two years for peak flavor and appearance.
Why It Doesn’t Actually Expire
The FDA requires an expiration date on the label, but that date reflects quality rather than safety. Vinegar is a fermented product, and its acidity (typically around 5%) creates an environment where harmful bacteria simply can’t survive. Research confirms that apple cider vinegar has antimicrobial properties strong enough to damage the cell walls of several types of bacteria on contact. That same acidity is what keeps the vinegar itself from going bad.
The Vinegar Institute describes the shelf life of vinegar as “almost indefinite.” Iowa State University Extension confirms that commercially prepared cider vinegar, along with other varieties like white, balsamic, and wine vinegar, is safe indefinitely. You don’t need to refrigerate it either. Refrigeration won’t improve its shelf life or preserve its quality any better than a pantry will.
What Changes Over Time
While apple cider vinegar stays safe, it does undergo physical changes that can look alarming if you’re not expecting them. The most common is the appearance of a cloudy, jellyfish-like blob floating in the bottle. This is called the “mother of vinegar,” a biofilm formed by bacteria that convert alcohol into acetic acid when exposed to oxygen. The Canadian Food Inspection Agency confirms that mother of vinegar poses no health risk whatsoever. It’s more common in unpasteurized vinegar, and it can form in any bottle that contains trace amounts of unfermented sugar or alcohol.
Over time, you may also notice the color darkening slightly, sediment settling at the bottom, or a stronger, harsher taste. None of these changes make the vinegar unsafe. They’re cosmetic. If the appearance bothers you, you can strain out any sediment or mother before using it. The two-year guideline for opened bottles is really about flavor quality. After that point, the taste may become more intense or slightly off from what you’d expect, but it’s still perfectly fine for cooking, cleaning, or any other use.
How to Store It Properly
The best spot for apple cider vinegar is a cool, dark place like a kitchen pantry or cabinet. Room temperature is ideal. The two things that degrade quality fastest are heat and light. Direct sunlight in particular breaks down flavor, color, and acidity over time. If you’ve ever seen a bottle of vinegar sitting on a windowsill that looks faded and watery, that’s why. UC Davis food safety guidelines specifically warn against displaying vinegar in sunlight, even decorative flavored varieties.
Keep the cap tightly sealed when you’re not using it. Oxygen exposure encourages the formation of mother and can gradually weaken the acidity. An airtight seal slows both of those processes considerably.
Glass vs. Plastic Bottles
If you’re buying apple cider vinegar in plastic, it’s fine for short to medium-term use, but glass is the better choice for long-term storage. Apple cider vinegar is acidic enough to interact with plastic over time, potentially drawing out trace compounds from the container. Most plastic vinegar bottles are made from PET, which can release small amounts of processing byproducts into acidic liquids. These compounds are generally considered inert, though some researchers have raised questions about whether certain plastic-derived molecules could mimic hormones at very low levels.
Glass is chemically inert and won’t react with the vinegar regardless of how long you store it. Glass containers also tend to seal more tightly than plastic, which helps preserve both flavor and acidity. If you buy a plastic bottle and plan to keep it for more than a few months, transferring the vinegar to a glass jar or bottle with a tight-fitting lid is a simple upgrade.
When to Replace It
There’s no hard expiration point where apple cider vinegar becomes dangerous. But if you’re using it for pickling or canning, acidity matters. The USDA recommends vinegar with at least 5% acidity for safe home canning. A very old bottle that’s been stored poorly, left open frequently, or exposed to a lot of light may have lost enough acidity to fall below that threshold. For everyday cooking, salad dressings, or household cleaning, even old vinegar works fine. If it smells like vinegar and tastes like vinegar, it is vinegar, and it’s doing its job.