How Long Does Sauerkraut Last?
Fermented sauerkraut keeps for months in the fridge thanks to its acid and salt. How long, how to store it, and the signs it's off.
One of the joys of fermenting is that the result keeps itself: sauerkraut is preserved by the very acid it produces. Here's how long it lasts and how to keep it at its best.
In the fridge
Once your sauerkraut is as sour as you like, move it to the fridge. Cold slows the fermentation almost to a stop, and the kraut keeps for roughly 4 to 6 months, frequently longer. It stays safe well beyond that if kept submerged and clean; what changes is texture and tang, it gradually softens and sours.
| Storage | How long it keeps |
|---|---|
| Fridge, submerged | 4 to 6 months+ |
| Room temperature | Keeps fermenting, use sooner |
How to store it
- Keep the kraut under its brine in the jar; exposed kraut on top can grow mould.
- Use a clean utensil every time, never a used fork, to avoid introducing spoilage organisms.
- Keep the jar sealed and cold.
Submerged and clean is the whole secret. The same rule that governs the ferment governs its storage: what stays under the brine stays good, and what sits exposed on top is where trouble starts.
Signs it's off
A little softening, cloudiness and stronger sourness are all normal. Throw it out only if you see fuzzy mould or it smells putrid or rotten rather than sharply sour. For questions about safety of home-fermented foods, the NCHFP is the authority.
The verdict
Fermented sauerkraut keeps 4 to 6 months or more in the fridge when it's kept submerged, sealed and handled with clean utensils. It slowly softens and sours with time but stays good; trust your nose and eyes, and discard only for mould or a putrid smell.
Homemade sauerkraut keeps around 4 to 6 months, often longer, in the fridge, preserved by its own acid and salt. Keep it submerged under the brine, sealed, and handled with clean utensils. It softens and sours over time but stays good; discard only for fuzzy mould or a putrid smell.
Frequently asked questions
How long does homemade sauerkraut last?
Around 4 to 6 months, often longer, in the fridge, because its lactic acid and salt hold spoilage organisms back. Keep it submerged under its brine in a sealed jar and use a clean utensil each time.
How do you know if sauerkraut has gone bad?
Trust your senses: fuzzy or coloured mold, a rotten or off smell, or sliminess means discard it. A sour smell and tangy taste are normal. When in doubt about safety, follow USDA or NCHFP guidance.
Does refrigerating sauerkraut stop fermentation?
It slows it greatly rather than stopping it, so kraut keeps getting slightly more sour over time in the fridge. That is normal and safe as long as it stays under brine and looks and smells right.
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