What Is The Shelf Life of Fermented Foods?

Do you want to know how long will fermented vegetables last in the basement? Or how long can you keep kombucha in the fridge? Here is everything you need to know about the shelf life of fermented foods.

How Fermentation Preserves Food

Ultimately, the goal of food preservation is to prevent unwanted bacteria, yeasts and molds from spoiling food. Preservation also maintains the flavour and texture of food.

Fermentation preserves food through a number of mechanisms, depending on the type of fermentation.

1. Culturing food with particular strains of bacteria, yeast or mold will inhibit the growth of undesirable bacteria, yeasts and mold. A good culture will outcompete with the bad culture and prevent spoiling. Yogurt is a good example of this. A jug of milk lasts, on average, about 7 days after it has been opened. If that milk is cultured into yogurt it should last at least 14 days.
2. Vegetables become more acidic as they ferment, which limits the growth of unwanted bacteria. In a sense, fermented vegetables are naturally pickled by the lactic bacteria.
3. Beverages fermented with a yeast-based culture (beer, wine, kombucha and kefir) will become alcoholic over time, which also prevents the growth of bacteria and yeasts.

The Shelf Life of Fermented Foods

The shelf life of fermented food is somewhat subjective. Fermented food continues to ferment, even if you store it in the fridge. And deciding if the food still tastes good will depend on your tastebuds.

Regardless, here are some rough guidelines:

Vegetables

Fermented vegetables will become softer and more acidic as they age. So the shelf life of fermented vegetables will really depend on how you want to serve them.

• Sauerkraut and cucumber pickles are traditionally long-fermented vegetables. They can last for up to a year in a dark, cool location.
• Other pickled vegetables can also be stored in a cool dark location for 6 months to a year. However, they will become really soft as they ferment. Since I like my fermented carrots, green beans and turnips to still have some texture, I store them in the fridge for up to a month after the initial fermentation.
• Chutney, salsa and relish will all soften and sour as they age. I recommend storing them in the fridge for up to 3 months or in the freezer for 6 months.
• Hot sauce can last for 6 months in a cool dark location.
• Kimchi is typically eaten fresh, so after 3-5 days of fermentation. However, it is a sauerkraut-like ferment, so it can easily last up to a year in a cool dark location.

Kombucha, water kefir, kvass, ginger bug and jun

Fermented soda pop will continue to ferment, even if it is stored in the fridge. They will become sourer as they age, so enjoy them while they taste good! Or store them in the fridge for up to 6 months.

Homemade Alcoholic Beverages

Beer and cider are low alcohol, and unless you use preservatives, they will continue to ferment until most of the sugars are consumed.

• Homebrewed Beer is at it’s best around 4 months.
• Cider should be stored in the fridge after bottling to slow down the carbonation. It tastes best the first 4 weeks after bottling.
• Wine has a higher alcohol content, and it actually tastes better as it ages. Store homemade wine in a cool dark location. And don’t start drinking it until after it has aged for at least a year. It should last in storage for around 5 years.

Miso

Good miso is aged for at least a year. Once you’ve opened it and started using it, then store it in the fridge. Miso will last for years, but it tastes best in the first year. After that it starts to lose its flavour.

How to Tell if Fermented Food has Spoiled

It is usually fairly obvious when a fermented food has gone off. However, no one really wants to admit that something they’ve been waiting for months to eat has gone bad. 

Here’s how to tell if a ferment has gone off:

1. Visual inspection: Start by looking at the ferment. Older ferments may have a slightly duller colour. However, if you see mold, then it has gone off, and you will need to throw it out. Ferments contaminated with yeast may still be okay to eat. For more information read this post on the difference between kham yeast and mold.
2. Smell: Fermented food should smell good. Even after fermenting for a few months, kombucha should smell like really strong kombucha. Sauerkraut should smell like really strong sauerkraut. If the food smells rotten, moldy or bad, then throw it out.
3. Taste: If the ferment doesn’t taste like you expect, or if it doesn’t taste good, then it’s probably gone off. Either it fermented for too long, or it has been contaminated by unwanted bacteria. Either way, you shouldn’t eat it.