How Long Olives Last in the Refrigerator and When to Throw Them Out

Olives do go bad in the refrigerator, but it takes a long time

Olives stored in the refrigerator last far longer than most foods—typically three to six months if they stay in their original brine or oil. The salt and acid in the liquid act as natural preservatives, which is why olives have been kept this way for centuries. Once you open a jar or container, the clock starts, but the timeline is still measured in months, not weeks.

The key is keeping olives submerged in their liquid. If the brine or oil level drops below the olives, the exposed ones will dry out, develop mold, or spoil. A sealed, unopened jar can last even longer—sometimes a year or more—because no air has entered the container.

Key Takeaways

• Unopened jars of olives keep for one year or longer in the refrigerator, while opened containers last three to six months if kept submerged in brine or oil.
• Olives must stay covered by their liquid; any that sit above the surface will spoil, develop mold, or turn mushy within days.
• Signs of spoilage include visible mold, a sour or off smell, sliminess, or a cloudy brine—discard the entire container if you see any of these.
• Transferring olives to a smaller container as you eat them keeps the remaining olives submerged without adding new liquid.
• Olives stored in oil last slightly longer than those in brine, but both methods work well in a standard refrigerator.

How to store olives so they last the full three to six months

The moment you open a jar, olives begin to oxidize and lose their brine protection if exposed to air. Keep the container sealed between uses. If the original lid no longer closes tightly, transfer the olives and their liquid to a glass jar with a screw-top lid or a plastic container with a snap-on cover.

As you remove olives, the liquid level drops. Rather than topping it off with water (which dilutes the brine and reduces preservation), transfer the remaining olives to a smaller container so they stay fully submerged in the original liquid. A pint-sized glass jar works well for this. The smaller the headspace above the olives, the less air can promote spoilage.

Store the container on a shelf in the main body of the refrigerator, not in the door. Door shelves experience temperature swings every time you open the fridge, which speeds up spoilage. A constant temperature of 35 to 40 degrees Fahrenheit is ideal.

Signs that olives have gone bad and should be discarded

Visible mold is the clearest warning sign. It appears as white, green, or black fuzzy growth on the olives or the inside of the container. If you see mold, discard the entire container—mold spreads through brine quickly, and you cannot safely remove just the affected olives.

A sour, vinegary, or otherwise off smell means fermentation or bacterial growth has begun. Open the jar and take a sniff; if it smells wrong, do not taste it. Sliminess on the olives or a cloudy, murky brine are also signs of spoilage. Olives should feel firm, not mushy or slimy, and the brine should be clear or slightly cloudy from salt crystals, not thick or discolored.

Taste is a last resort. If you are unsure, take a small bite. Spoiled olives taste sour, musty, or off in a way that is immediately obvious. Spit it out and throw away the container. Trust your senses—olives are inexpensive enough that it is not worth the risk of food poisoning.

The difference between olives in brine and olives in oil

Olives packed in brine (salt water) are the most common type and keep well for three to six months once opened. The salt content is high enough to prevent most bacterial growth, and the acidic brine slows oxidation. Brine-packed olives are also easier to rinse if you want to reduce salt intake before eating them.

Olives in oil—often labeled as "oil-cured" or packed in olive oil—last slightly longer because oil creates a barrier against air and bacteria. However, oil-cured olives are often drier to begin with and may have a stronger, more concentrated flavor. Both types follow the same storage rules: keep them submerged, seal the container, and store in the main refrigerator compartment.

Do not confuse oil-packed olives with olives that have simply had oil added to brine. Read the label to see what the primary liquid is. If you are unsure, treat it as brine-packed and follow the same three- to six-month timeline.

What happens if you leave olives at room temperature

Olives left on the counter or in a pantry spoil within days, even in their original sealed jar. Room temperature—typically 68 to 72 degrees Fahrenheit—is warm enough for bacteria and mold to grow rapidly. The brine or oil slows this process but does not stop it.

If a jar of olives has been left out for more than two hours, move it to the refrigerator immediately. If it has been sitting out overnight or longer, discard it. The risk of botulism, while rare, increases when canned or jarred foods are stored at room temperature for extended periods.

Can you freeze olives to extend their life

Freezing olives is possible but not recommended for most uses. Olives have a high water content, and freezing breaks down their cell structure. When thawed, they become mushy and lose their firm texture. The flavor remains largely intact, but the eating experience suffers.

Freezing works only if you plan to use the thawed olives in cooking—added to stews, pasta sauces, or tapenade—where texture matters less. If you want to eat them as a snack or on a charcuterie board, refrigeration is the better choice. Frozen olives keep for several months, but you lose the quality that makes fresh olives worth eating.

How to tell if unopened olives are still good

An unopened jar or can of olives can sit in the pantry or refrigerator for a year or longer, depending on the packing method and storage conditions. Check the expiration or "best by" date on the label. Most manufacturers set this date conservatively, and olives often remain safe and palatable well past it.

Before opening, inspect the jar for signs of damage: dents, cracks, or leaks. A swollen lid or bulging can indicates bacterial gas buildup and means the contents have spoiled. Do not open it. If the jar looks intact and the date has not passed by more than a few months, open it and check the brine. If it looks clear and smells normal, the olives are safe to eat.

Once opened, treat it like any other opened container and follow the three- to six-month guideline for storage in the refrigerator.

Frequently Asked Questions

Can I eat olives that have been in the fridge for a year?

If the jar was unopened and stored in the refrigerator the entire time, yes—olives often remain safe and tasty for a year or longer. Check the brine for cloudiness or mold, and smell the jar before opening. If it looks and smells normal, they are likely fine. Once opened, use them within three to six months.

Why did my olives turn mushy?

Mushiness usually means the olives were exposed to air for too long or the brine level dropped below the surface. Olives left partially submerged oxidize and soften. It can also happen if the container was stored in a warm spot or if fermentation has begun. Mushy olives are safe to eat if there is no mold or off smell, but the texture is compromised.

Do I need to rinse olives before eating them?

Rinsing is optional and depends on your salt preference. Brine-packed olives are high in sodium, and rinsing removes some of it. Oil-packed olives have less salt but more fat. Rinsing does not extend shelf life—return the rinsed olives to the refrigerator in their original liquid or a fresh brine made from salt and water.

What should I do if I find mold in an olive jar?

Discard the entire container. Mold spreads through brine quickly, and you cannot safely remove just the moldy olives. Do not attempt to scoop out the affected ones and keep the rest. The spores are already throughout the liquid.

Can I add new brine to olives if the level gets low?

Yes, but it dilutes the salt concentration and reduces preservation. Make a fresh brine by dissolving one tablespoon of salt in one cup of water, let it cool, and pour it over the olives until they are fully submerged. A better approach is to transfer the olives to a smaller container so they stay covered in the original brine without adding anything new.