How Long Does Kombucha Last?
Opened kombucha stays fizzy and pleasant for about 1 week in the fridge. Unopened raw kombucha keeps 3–6 months refrigerated, or until its printed date. Keep raw kombucha cold at all times.
Kombucha — opened
shelf life- Unopened: 3–6 months in the fridge
- Homemade: 1–3 months in the fridge
Fridge at 40°F (4°C) or below · freezer at 0°F (−18°C). Freezer times are for best quality; frozen food stays safe longer.
Kombucha is sweetened tea fermented by a culture of bacteria and yeast into a tart, lightly fizzy drink. Its acidity protects it from most spoilage organisms, so it rarely goes bad in the usual sense. Because raw kombucha is still alive, however, warmth restarts fermentation in the bottle, building pressure, sourness and alcohol.
How to store kombucha
- Keep raw kombucha refrigerated from store to home. A bottle left warm keeps fermenting and can gush or, in rare cases with home bottling, burst.
- Store bottles upright and open them slowly over the sink, especially if the bottle was shaken or has warmed up.
- Recap the bottle tightly right after pouring to hold on to the carbonation.
- For home brews, use bottles rated for pressure, leave an inch or so of headspace and move them to the fridge as soon as they are carbonated.
How to tell if kombucha has gone bad
- Fuzzy, dry, raised mold in white, green, blue or black on the surface of a home brew means the whole batch and the culture must be thrown away.
- A smell of rot or cheese rather than the normal sharp, vinegary tang.
- Brown stringy bits, sediment and a small jelly-like disc are normal yeast and culture growth, not spoilage.
- A taste like straight vinegar means it is over-fermented: unpleasant, but not unsafe.
Bacteria that cause food poisoning usually do not change the look, smell or taste of food. Go by the time limits first, and the signs above second.
Kombucha shelf life chart
| State | Fridge | Freezer | Pantry |
|---|---|---|---|
| Opened | 1 week | Not recommended | Not recommended |
| Quality window: it goes flat and more sour, but the acidity keeps it safe longer if it stays cold and capped. | |||
| Unopened | 3–6 months | Not recommended | Not recommended |
| Raw, refrigerated kombucha; the printed date governs. Pasteurized shelf-stable brands can be kept in the pantry until opened. | |||
| Homemade | 1–3 months | Not recommended | Not recommended |
| Bottled after fermenting. It keeps slowly souring; open a bottle periodically to release pressure. | |||
Not safe = perishable: no more than 2 hours at room temperature (1 hour above 90°F / 32°C). Not recommended = possible, but quality suffers or it serves no purpose.
Frequently asked questions
Does kombucha need to be refrigerated?
Raw, unpasteurized kombucha does, even before it is opened. Cold keeps the live yeast and bacteria nearly dormant. At room temperature they keep consuming sugar, which raises the pressure, the sourness and the alcohol content. Only kombucha that is labeled shelf-stable, usually pasteurized, can be stored in the pantry, and it should be refrigerated after opening.
What are the floating things in my kombucha?
They are almost always harmless strands of yeast and bits of the culture, sometimes forming a small, slippery disc that is a new baby culture. They are a normal sign of raw kombucha and can be swallowed or strained out. Mold looks different: fuzzy, dry and sitting on top of the surface.
Can kombucha be left out overnight?
A sealed bottle left out overnight is generally still safe because of its acidity, but it will have fermented further, so chill it thoroughly and open it carefully over the sink. Return it to the fridge and do not make a habit of it. Repeated warming produces a sour, over-carbonated and slightly more alcoholic drink.
Is kombucha safe to drink after the expiration date?
Unopened and continuously refrigerated, kombucha is usually still safe somewhat past its date, since the acid environment is hostile to pathogens, but expect a much sharper, more vinegary flavor. Discard it if there is mold, an off smell, or if the bottle was stored warm. Pregnant women and people with weak immune systems should be more cautious with raw kombucha generally.
Related foods
| Food | Fridge | Freezer | Pantry |
|---|---|---|---|
| Tea Brewed |
3–4 days | 2–3 months | 8 hours |
| Kefir Opened |
1–2 weeks | 1–2 months | Not safe |
| Kimchi Opened |
3–6 months | Not recommended | Not recommended |
| Sauerkraut Opened, refrigerated |
4–6 months | Not recommended | Not safe |
| Vinegar Opened |
Not recommended | Not recommended | Indefinitely |
| Soda Unopened |
6–9 months | Not recommended | 6–9 months |
More coffee & tea: Coffee.
Reviewed 2026-09-20. Times follow published USDA FoodKeeper / FSIS, FDA and CDC storage guidance; where sources differ we use the shorter time. How we compile this data.