How Long Capers Stay Fresh in Your Refrigerator

Unopened capers last 1 to 2 years; opened jars last 4 to 6 months

An unopened jar of capers will keep in your refrigerator for 1 to 2 years because they're preserved in brine or salt, which acts as a natural preservative. Once you open the jar, the timeline shrinks to 4 to 6 months. The exact length depends on how you store them after opening—whether the capers stay submerged in their brine, how often you open the jar, and whether you use clean utensils each time you remove them.

Capers are one of the more forgiving preserved foods because the salt or vinegar in the brine does most of the work for you. But storage habits matter. A jar left open on the counter or one where capers dry out will spoil faster than one kept sealed and cold.

Key Takeaways

• Unopened capers in the refrigerator stay good for 1 to 2 years because the brine preserves them naturally.
• Once opened, capers last 4 to 6 months if kept submerged in their original brine and the jar stays sealed between uses.
• Capers exposed to air or removed from brine will mold or soften within weeks, so always keep them covered with liquid.
• Use a clean spoon or fork every time you remove capers to prevent bacteria from entering the jar.
• If capers smell sour, look slimy, or show mold, discard the entire jar—the brine has broken down.

Why the brine matters more than the cold

The brine—the salty or vinegary liquid capers are packed in—is what actually preserves them, not the refrigerator temperature alone. Salt and acid both inhibit the growth of mold and bacteria. When capers are submerged in brine, they're in an environment hostile to spoilage. The moment they're exposed to air, that protection weakens.

This is why an opened jar stored at room temperature on a shelf might last longer than an opened jar in the refrigerator with capers sitting above the brine line. The cold slows decay, but it doesn't replace the brine's protective role. If you open a jar and some capers poke above the liquid, push them back down or add a little extra brine (saltwater or vinegar, depending on what the jar contains) to keep them submerged.

How to store opened capers to extend their life

After opening, keep the jar sealed tightly between uses. Every time you open it, you introduce air and potential bacteria. Use a clean utensil—a small spoon or fork—to remove only what you need, rather than fishing with your fingers or a used knife. If you use a utensil that's been in food, wash it before putting it back into the jar.

Store the jar on a refrigerator shelf, not in the door. Door shelves experience temperature swings every time the door opens, which speeds up spoilage. A shelf deeper inside the refrigerator stays more stable. Keep the jar upright so the capers stay submerged in their brine. If liquid has evaporated and capers are exposed, top it up with a mixture of salt and water (about 1 tablespoon salt per cup of water) or vinegar, depending on what the original jar contained.

Signs capers have gone bad

Capers that have spoiled will show clear warning signs. Look for mold on the surface or sides of the jar—any fuzzy growth means the jar should be thrown out. Smell the jar when you open it; spoiled capers smell distinctly sour or fermented in an unpleasant way, not the sharp vinegary smell of fresh capers. If capers feel slimy or mushy instead of firm and slightly crunchy, the brine has broken down and they're no longer safe to eat.

Discoloration alone isn't always a sign of spoilage—capers naturally darken over time—but if they've turned brown or black and feel soft, discard them. When in doubt, throw the jar out. The cost of a jar of capers is low compared to the risk of foodborne illness.

Unopened jars and pantry storage

An unopened jar of capers can sit in a cool, dark pantry or cupboard for years, though the refrigerator is ideal if you have space. The brine is sealed and airtight, so temperature fluctuations in a pantry won't harm them as quickly as they would an opened jar. Check the expiration date on the label, but many capers will remain good well past that date if the jar is undamaged and the seal is intact.

If you buy capers in bulk or don't use them often, store unopened jars in the refrigerator to slow any very gradual degradation of flavor and texture. This is especially useful if your kitchen is warm or if you live somewhere humid. A cold, stable environment preserves the firm texture and sharp flavor longer than a warm one.

Transferring capers to a smaller jar

If you open a large jar and know you won't use all the capers within a few months, transfer the unused portion to a smaller, clean jar with fresh brine. This reduces the amount of air in the container and limits how often you open the main jar. Use a jar that's been washed in hot soapy water and dried completely, or run it through the dishwasher.

Pour enough brine from the original jar to cover the capers completely in the new container. Seal it tightly and refrigerate. This method can extend the life of opened capers by a few weeks because you're minimizing air exposure and keeping the smaller jar sealed most of the time. Label the new jar with the date you transferred them so you remember when to use them.

Freezing capers as a last resort

Capers can be frozen, though freezing changes their texture—they become softer and lose some of their firm bite. If you have capers nearing the end of their 4 to 6 month window and won't use them, freezing is better than throwing them away. Drain them from the brine, spread them on a parchment-lined tray, and freeze for a few hours until solid. Transfer to a freezer bag or airtight container and freeze for up to a year.

Thawed capers work well in cooked dishes like pasta sauces, fish preparations, or salads where texture matters less. They won't work as well as a fresh garnish or in dishes where you want that crisp snap. Use frozen capers within a few months of freezing for the best flavor.

Frequently Asked Questions

Can I leave capers out on the counter after opening?

Not for long. Capers left at room temperature will last only a few days to a week before mold appears or the brine breaks down. The refrigerator slows bacterial growth significantly. If you've left capers out for more than a few hours, refrigerate them immediately and use them within a day or two.

What if the brine looks cloudy or has particles floating in it?

Cloudiness or floating particles can be salt crystals or sediment from the capers themselves, which is normal. Smell the jar and check the capers for mold or slime. If they smell and look fine, they're safe. If the cloudiness is accompanied by a sour smell or visible mold, discard the jar.

Do capers need to be refrigerated before opening?

No. An unopened jar can sit in a cool pantry or cupboard for years. Refrigerating unopened capers is optional and mainly useful if your kitchen is very warm or humid. Once opened, refrigeration becomes essential to slow spoilage.

Can I reuse the brine from one jar for another?

Yes, if the original jar showed no signs of spoilage. Strain the brine through a fine mesh to remove any debris, then use it to cover capers in a new container. This is a good way to extend the life of capers you've transferred to a smaller jar.

How do I know if capers are still good if they look normal?

Smell and taste are your best guides. Open the jar and take a sniff—fresh capers smell sharp and vinegary. If there's any musty, moldy, or off smell, don't taste them. If the smell is fine, taste a single caper. It should be firm and salty. If it's mushy or tastes fermented in a bad way, throw the jar out.