How Long Does Kefir Last In The Fridge?

Kefir, a popular fermented dairy product renowned for its tangy taste and myriad health benefits. It has gained immense popularity worldwide among health enthusiasts and culinary aficionados alike. 

If you are among those who love to indulge in the yummy goodness of kefir or if you ever found yourself staring at that leftover bottle of kefir in your fridge and wondering: How long does kefir last in the fridge? You’re not alone. 

As with any perishable item like kefir, understanding how long it will last in the fridge is crucial to maintain its freshness and nutritional integrity. 

In this article, we delve into the world of kefir and tackle the most burning question about its shelf life. We will explore its origins, nutritional benefits, and the key aspects that determine its shelf life. 

So, no matter if you’re a seasoned kefir enthusiast or a newcomer to this probiotic-rich beverage, knowing the ins and outs of kefir storage will ensure you savor every sip while maximizing its health-promoting qualities. 

Put your seatbelt on and join us on a journey to unravel the secrets of kefir longevity and the best practices for preserving its deliciousness in your refrigerator.

What is kefir?

Kefir is a globally popular fermented dairy product with a distinctive flavor and creaminess. It has a rich history and offers numerous health benefits

Originating from the Caucasus region (central Asia and Eastern Europe), this tangy beverage is made through the fermentation of milk using kefir grains. These grains are not traditional cereal grains. They are in fact a combination of bacteria and yeast that form a symbiotic culture. 

The fermentation process transforms ordinary milk into a probiotic-rich drink that is packed with live cultures, vitamins, and enzymes. The result is a slightly effervescent liquid with a distinctive tart taste and a texture similar to thin yogurt. 

Beyond its delicious flavor, kefir is well known for the potential health benefits that it offers such as aiding digestion, supporting the immune system, and promoting gut health. 

Kefir usually comes in different varieties like traditional milk-based kefir and non-dairy alternatives so that people with dietary preferences could enjoy it too. 

Whether enjoyed plain, blended into smoothies, or poured over cereal, kefir can be a versatile and nutritious addition to your well-balanced diet.

How to make kefir?

Making kefir at home is a super straightforward and rewarding process. To get started, you’ll need kefir grains which are small, gelatinous structures containing a combination of bacteria and yeast. 

Here’s a basic guide on how to make kefir:


  • Kefir grains
  • Milk (cow’s milk, goat’s milk, or alternative milk like coconut or almond milk)
  • Glass jar
  • Non-metal stirring utensil
  • Breathable cover (cheesecloth, paper towel, or coffee filter)
  • Rubber band or string


  • Acquire Kefir Grains: First of all, obtain kefir grains from a reliable source. They may be available online, through local communities, or from friends who make their own kefir.
  • Prepare the Jar: Once you get the grains, clean a glass jar thoroughly. Avoid using metal utensils or containers as metal can react with the kefir grains because it is a live symbiotic culture.
  • Add Kefir Grains and Milk: Now, place the kefir grains in the jar and pour in the milk. The ratio is typically one to two tablespoons of kefir grains per one to two cups of milk. You can adjust the quantity based on your preferences.
  • Stir Gently: Stir the mixture gently with a non-metal utensil to ensure the kefir grains are well distributed in the milk.
  • Cover and Ferment: Cover the jar with a breathable material such as cheesecloth, paper towel, or a coffee filter. Secure it with a rubber band or string. Allow the mixture to ferment at room temperature, away from direct sunlight or any heat source. The fermentation time can vary from 12 to 48 hours, depending on your desired thickness and tartness.
  • Strain the Kefir: After the fermentation period, strain the kefir grains from the liquid. You can use a plastic or nylon mesh sieve. But make sure it is not metal.
  • Rinse and Repeat: Rinse the kefir grains with filtered water and the grains are ready for your next batch. However, if you’re not making kefir immediately, you can store the grains in the fridge with a little milk to keep them alive.

How long does kefir last in the fridge?

Perishable items like kefir have a limited shelf life in the fridge. Generally, properly stored kefir can last for around 3 weeks in the refrigerator. However, refrigeration is quite essential to preserve the quality of kefir. 

As you know, kefir is a fermented dairy product that undergoes an active fermentation process wherein beneficial bacteria and yeast continue to thrive even after production.

Refrigeration significantly slows down this fermentation, helping you to maintain the desired texture, flavor, and nutritional content of the beverage. 

Without refrigeration, the ongoing fermentation process could lead to over-acidification, resulting in an overly sour taste and potentially altering the texture. 

Additionally, keeping kefir in a consistently cold environment inhibits the growth of harmful bacteria and molds, ensuring the safety of the product for consumption. 

Therefore, it is essential to keep kefir in a sealed, airtight container to prevent the absorption of odors and maintain its freshness for weeks. Also, it is strictly recommended to consume kefir within this advised period to avoid complications. 

How to store kefir?

Storing kefir in the fridge is a simple process. It is crucial to maintain its freshness and extend its shelf life. Here’s a quick and easy guide on how to store it in the fridge:

  • Use an Airtight Container: Transfer the kefir to a clean and airtight container. It will  help prevent the absorption of odors from the fridge and contamination, ultimately maintaining the quality of the kefir.
  • Leave Some Headroom: Do not forget to leave a bit of space at the top of the container to accommodate any expansion during fermentation. This is especially important if the kefir is still actively fermenting.
  • Seal Tightly: Ensure the container is sealed tightly to prevent extra air from entering. A secure seal helps slow down the fermentation process and keeps the kefir fresh.
  • Label the Container: Consider labeling the container with the date of preparation. This makes it easier to track the freshness of the kefir and ensures you consume it within a reasonable timeframe.
  • Store in the Refrigerator: Place the sealed container in the refrigerator. It will stay fresh for the next 3 weeks. 

Can you freeze kefir?

While technically, it is possible to freeze kefir, it’s not always recommended. The reason is, freezing can alter the texture and consistency of kefir, causing it to become grainy or separate upon thawing. 

The live cultures in kefir may also be affected by the freezing process that will potentially diminish the probiotic content. 

However, if you still choose to freeze kefir, keep a few things in mind. 

  • Do so in small portions. 
  • Use it in smoothies or cooking rather than consuming it directly. 
  • Before freezing, leave some room in the container for expansion. 
  • Ensure it is well-sealed to prevent freezer burn and the absorption of other odors. 

When you are ready to use, thaw frozen kefir in the refrigerator, allowing it to gradually return to its liquid state.

Ways to use kefir

Kefir is a versatile and nutritious ingredient that can be used in various culinary applications, adding a delightful tanginess and a boost of probiotics to your dishes. Here are several creative ways to incorporate kefir into your diet:


Making smoothies with kefir is a great idea. Blend kefir with fresh or frozen fruits such as berries, bananas, or mangoes, for a refreshing and probiotic-rich smoothie. Add a handful of greens like spinach or kale, and a touch of honey or maple syrup for sweetness.

Breakfast Parfaits

Incorporate kefir in your breakfast for an exciting change. Layer kefir with granola, fresh fruits, and a drizzle of honey to create a delicious and wholesome breakfast parfait. This provides a satisfying crunch along with the creamy kefir.

Salad Dressings

Use kefir as a base for homemade salad dressings. Combine it with olive oil, lemon juice, herbs, and spices to create a creamy and tangy dressing that elevates the flavor of your salads.


Use kefir in your marinades. Marinate meats, poultry, or tofu in kefir to tenderize and infuse them with flavor. The acidity of kefir helps break down proteins that will result in a juicy, tender, and flavorful dish when grilled or roasted.

Dips and Sauces

Making dips and sauces with kefir will give them a distinct taste and some nutrition. Mix kefir with herbs, garlic, and spices to create a tasty dip for veggies or a sauce for grilled meats. It’s a healthier alternative to traditional mayonnaise-based dips.

Frozen Treats

You can also make homemade frozen treats by blending kefir with fruits and freezing the mixture in popsicle molds. These kefir popsicles are a refreshing and healthier alternative to store-bought frozen desserts.

Is kefir healthy?

Yes, kefir is considered a healthy and nutritious food with various health benefits. Here are some of the key reasons why kefir is often regarded as a health-promoting beverage:

  • Probiotics: Kefir is rich in probiotics which are highly beneficial bacteria that support a healthy gut microbiome. These live cultures can contribute to improved digestion, nutrient absorption, and overall gut health. A balanced gut microbiome is associated with various health benefits including a strengthened immune system.
  • Nutrient-Rich: Kefir is a good source of several essential nutrients including calcium, vitamin K2, vitamin B12, magnesium, and phosphorus. These nutrients are important for bone health, blood clotting, energy metabolism, and various other body functions.
  • Lactose Digestion: The fermentation process of kefir breaks down much of the lactose present in milk. As a result, many lactose-intolerant individuals find kefir easier to digest than regular milk. The beneficial bacteria in kefir help digest lactose and may alleviate symptoms of lactose intolerance.
  • Antimicrobial Properties: Kefir has been studied for its potential antimicrobial properties which may help inhibit the growth of harmful bacteria and pathogens in the digestive system, ultimately improving overall health.

Does kefir go bad?

Yes, kefir can go bad if not stored and handled properly. The presence of live cultures of bacteria & yeast and the fermentation process make kefir susceptible to spoilage. 

Signs that indicate kefir may have gone bad include a foul or off-putting odor, an unusual color, mold growth, or a separated and curdled texture. 

So, if you ever notice any of these signs, it’s advisable to discard the kefir to avoid consuming spoiled or potentially harmful bacteria.

Can you have expired kefir?

No, you can’t have expired kefir. Consuming expired kefir is not recommended at all as it may pose serious health risks. 

Over time, the live cultures in kefir diminish and the product becomes more susceptible to spoilage by harmful bacteria. Therefore, if kefir has passed its expiration date or shows signs of spoilage, it is advisable not to keep it further. 

Consuming expired or spoiled kefir may lead to gastrointestinal issues or foodborne illnesses such as vomiting, nausea, stomach cramps, low bowel movement, or abdominal pain which may prove fatal.


Is kefir ok if fizzy?

Yes, kefir can be fizzy, especially if it’s been allowed to ferment for an extended period. The effervescence is a natural byproduct of the fermentation process and kefir is generally safe to consume.

Why is kefir so expensive?

Kefir can be relatively expensive due to the specialized production process and the use of live cultures. The production involves carefully cultivated kefir grains and controlled fermentation, contributing to labor-intensive and time-consuming procedures.

Does kefir continue to ferment in the fridge?

Yes, kefir continues to ferment in the fridge, however at a much slower rate than at room temperature. The cold temperature slows down the activity of the live cultures, in return extending the shelf life of kefir.

Should you stir kefir?

Yes, it’s a good practice to stir kefir gently before consuming it. Stirring helps distribute any settled particles and ensures a consistent taste and texture throughout the beverage.


Kefir stands out as a versatile and nutritious addition to your diet, offering a myriad of health benefits with flavors. 

Whether enjoyed on its own, blended into smoothies, or used in various culinary applications, the probiotic-rich nature of kefir promotes gut health and provides essential nutrients. 

Although, proper storage in the fridge is crucial to maintain its freshness, extend its shelf life, and ensure the continued viability of beneficial cultures. So, cheers to the delightful and healthful journey with kefir!

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