Does sauerkraut go bad?

Does Sauerkraut Go Bad? How Long Does Sauerkraut Last?

Sauerkraut, with its tangy flavor and rich history, often leaves many pondering: Does sauerkraut go bad?

This fermented dish, originally crafted as a preservation method before the age of refrigeration, has been a culinary favorite for ages. Yet, its longevity remains a topic of debate.

In this article, we’ll demystify the shelf life of sauerkraut, guide you on proper storage, and help you identify when it’s time to enjoy or discard. Whether you’re a sauerkraut aficionado or just curious about that jar in your fridge, we’ve got you covered.

Does Sauerkraut Go Bad

Yes, sauerkraut can go bad. Despite being a fermented product, it can go bad due to several reasons:

  1. Nature of Fermentation: Fermentation is a controlled decay process where beneficial bacteria break down the sugars in cabbage to produce lactic acid. This acid acts as a natural preservative, but it doesn’t make sauerkraut immune to spoilage.
  2. Bacterial Balance: The fermentation process relies on a delicate balance of beneficial bacteria. If harmful bacteria or molds are introduced or if they outcompete the good bacteria, it can lead to spoilage.
  3. Oxygen Exposure: Sauerkraut fermentation is an anaerobic process, meaning it occurs in the absence of oxygen. If sauerkraut is exposed to air, it can disrupt the fermentation balance, allowing unwanted bacteria and molds to thrive.
  4. pH Levels: The acidity created by the lactic acid bacteria keeps harmful microbes at bay. If the pH level rises, making the environment less acidic, it can become a breeding ground for spoilage organisms.

In essence, while sauerkraut’s fermentation process gives it a degree of preservation, it’s still susceptible to spoilage if the conditions aren’t right.

Related: Do Pickles Go Bad? How Long Do Pickles Last After Opening

What is Sauerkraut?

Before we dive further into sauerkraut’s shelf life, let’s briefly discuss what it is.

Sauerkraut is a traditional fermented dish made primarily from finely sliced cabbage. The cabbage is mixed with salt and then packed tightly into a container. Over time, the natural sugars in the cabbage are broken down by beneficial bacteria, producing lactic acid.

This lactic acid acts as a preservative and gives sauerkraut its distinctive tangy flavor. The fermentation process also enhances the nutritional value of the cabbage, introducing probiotics and increasing vitamin levels.

Originating in Central Europe, sauerkraut has become a staple in various cuisines around the world due to its unique taste and health benefits.

How Long Does Sauerkraut Last?

The longevity of sauerkraut largely depends on its type and how it’s stored.

The shelf life of unpasteurized sauerkraut can vary among brands. For example, Sonoma Brinery sets a “best by” date for months post-production in the fridge.

Other brands, such as Pickled Planet and Raw Supercrauts, typically ensure freshness for around a year after opening.

Given these variations, it’s wise to regularly check the ‘best by’ date printed on the container to ensure you’re consuming fresh sauerkraut.

Here’s a breakdown of its general shelf life based on different conditions:

  1. Unpasteurized Sauerkraut: This type of sauerkraut contains live bacteria and continues fermenting, even when stored. Typically, when refrigerated, unpasteurized sauerkraut can last for a couple of months. However, it’s essential to ensure the cabbage remains submerged in its brine to maintain its freshness.
  2. Pasteurized Sauerkraut: Pasteurization kills most bacteria, halting the fermentation process. As a result, pasteurized sauerkraut has a longer shelf life. Unopened, store-bought pasteurized sauerkraut can last for several months in a cool, dark place. Once opened and refrigerated, it should remain fresh for up to a couple of months to a year depending on the brand.
  3. Homemade Sauerkraut: Whether pasteurized or not, homemade sauerkraut generally has a shorter shelf life than store-bought varieties. When stored properly in the refrigerator, it can last anywhere from a few weeks to a few months. Again, keeping the cabbage submerged in its brine and using clean utensils is crucial.
  4. Freezing: To further extend the shelf life of sauerkraut, you can freeze it. This method pauses the fermentation process, and when thawed, the sauerkraut can retain its quality for a few days.
Type of SauerkrautShelf Life (Unopened)Shelf Life (Opened & Refrigerated)
Unpasteurized SauerkrautVaries (due to ongoing fermentation)A couple of months
Pasteurized SauerkrautSeveral monthsA couple of months to a year
Homemade SauerkrautVaries (depends on preparation)Few weeks to a few months

What to Expect When Storing Unpasteurized Sauerkraut

Unpasteurized sauerkraut is a living food, teeming with beneficial bacteria that actively continue the fermentation process. When you decide to store it, here’s what you can anticipate:

  1. Continuous Fermentation: Even in its jar, the sauerkraut will keep fermenting. This means the flavor will evolve over time, becoming tangier and more pronounced. If you’ve ever opened a jar and noticed a slight fizz or bubbling, that’s the fermentation in action!
  2. Brine Overflow: Due to the ongoing fermentation, gas is produced. This can sometimes cause the brine to overflow when the jar is opened. It’s a natural occurrence, but it’s a good idea to open the jar over a sink just in case.
  3. Color Changes: Over time, the vibrant green of fresh cabbage might mellow to a more muted or yellowish hue. This is a natural part of the fermentation process and doesn’t indicate spoilage.
  4. Texture Transformation: As the fermentation continues, the cabbage might soften a bit. While it will still retain some crunch, it won’t be as crisp as when it was freshly made.
  5. Temperature Sensitivity: Unpasteurized sauerkraut is sensitive to temperature. Storing it in a cooler environment, like a refrigerator, slows down the fermentation, while warmer temperatures speed it up.
  6. Mold Growth: If the cabbage isn’t fully submerged in brine, there’s a chance of mold growth on the surface. If this happens, it’s best to discard it.

How to Tell if Your Sauerkraut Has Gone Bad

Recognizing the signs of spoilage ensures you consume it at its best and avoid any potential health risks. Here’s what you should look out for:

  • Off-Odor: Fresh sauerkraut has a tangy, slightly sour aroma, characteristic of fermented foods. If your sauerkraut starts to emit a rancid, unpleasant, or off-putting smell, it’s a clear sign that it’s past its prime.
  • Mold Growth: While a white film on the surface can be a byproduct of fermentation, any colorful mold (green, black, or pink) is a sign of spoilage. If you spot mold, it’s best to discard the entire batch.
  • Discoloration: Fresh sauerkraut typically has a pale green to yellowish hue. If it turns brown or any other unusual color, it’s time to toss it.
  • Slimy Texture: While sauerkraut is moist due to its brine, it shouldn’t be slimy. A slippery or slimy texture indicates bacterial overgrowth and spoilage.
  • Unusual Taste: If the flavor of your sauerkraut is off, overly bitter, or just not right, trust your taste buds and refrain from eating it.

What is the Best Way to Store Sauerkraut?

Proper storage is the key to maintaining the freshness and flavor of your sauerkraut. By understanding the nuances of sauerkraut storage, you can enjoy its tangy goodness for longer. Let’s delve into the optimal storage methods.

Does Sauerkraut Need to Be Refrigerated?

Absolutely. While sauerkraut is a fermented product, refrigeration is essential, especially after breaking the seal. Storing it in a cold environment not only slows down the fermentation process but also helps in preserving its distinct taste and texture. If you’re using homemade sauerkraut, it’s even more vital to refrigerate it right from the start.

Keep Cabbage Submerged in Brine

Ensuring the cabbage remains submerged in its brine is more than just a tip—it’s a necessity. The brine acts as a protective barrier, preventing the cabbage from coming into contact with air. This not only keeps the cabbage crisp but also wards off harmful bacteria and mold. If you notice the cabbage peeking out from the brine, it’s time to take action.

Making Extra Brine

There might be instances where the original brine isn’t sufficient, especially if you’ve consumed some of the sauerkraut and the remaining portion isn’t fully submerged. Don’t fret! Making additional brine is a breeze.

Simply dissolve salt in water to create a saline solution, and pour it over the sauerkraut until it’s fully covered. This ensures your sauerkraut remains in an optimal environment, ready for your next culinary adventure.

Can You Freeze Sauerkraut?

Yes, you can freeze sauerkraut. Freezing is a viable option if you want to extend its shelf life beyond refrigeration. Here’s what you need to know:

  1. Packaging: Before freezing, ensure that the sauerkraut is packed in airtight containers or heavy-duty freezer bags. This prevents freezer burn and retains the sauerkraut’s quality.
  2. Brine: Make sure the sauerkraut is fully submerged in its brine before freezing. The brine acts as a protective layer, preserving the texture and flavor of the cabbage.
  3. Thawing: When you’re ready to use the frozen sauerkraut, it’s best to thaw it in the refrigerator for several hours or overnight. This ensures even thawing and maintains the sauerkraut’s texture.
  4. Texture and Flavor: While freezing sauerkraut preserves its safety and nutritional value, there might be a slight change in its texture and flavor. The sauerkraut might be a bit softer after thawing, but it will still retain its tangy taste.
  5. Usage: Once thawed, it’s advisable to use the sauerkraut within a few days for the best quality.

Frequently Asked Questions

Let’s address some common questions related to sauerkraut shelf life.

How do you know when sauerkraut is bad?

If the sauerkraut emits an off or rancid smell, changes color to brown or any unusual hue, or displays mold, it’s a sign that it’s gone bad.

Does sauerkraut go bad in the fridge?

While refrigeration slows down the fermentation process and extends the sauerkraut’s shelf life, it can still go bad over time, especially if not stored properly or if exposed to contaminants.

Is it OK to eat expired sauerkraut?

While sauerkraut can last beyond its expiration date, especially if unopened, it’s essential to check for signs of spoilage. If it looks, smells, and tastes fine, it’s likely safe to eat. However, always prioritize safety and discard any food you’re unsure about.

When should you not eat sauerkraut?

Avoid eating sauerkraut if it has an off odor, displays mold, has a slimy texture, or if the color has changed significantly. These are indicators of spoilage or bacterial overgrowth.


So, does sauerkraut go bad? Yes, but with proper storage and a keen eye, you can enjoy this tangy treat for quite a while. Whether store-bought or homemade, sauerkraut is a delicious addition to any meal. Enjoy!

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