How Long Does It Take to Brew Kombucha?
Quick Answer
7–30 days total. First fermentation takes 7–14 days, and optional second fermentation (for carbonation and flavoring) adds another 2–4 days.
Typical Duration
Quick Answer
Brewing kombucha takes 7–30 days depending on your taste preferences and whether you do a second fermentation. The first fermentation runs 7–14 days, and the optional second fermentation adds 2–4 more days for carbonation and flavor.
First Fermentation (F1): 7–14 Days
The first fermentation is where your SCOBY (symbiotic culture of bacteria and yeast) converts sweetened tea into kombucha. Here is what the timeline looks like:
| Day | What's Happening |
|---|---|
| 1–3 | SCOBY begins consuming sugar; tea still tastes sweet |
| 4–7 | Acidity rises; flavor becomes tart and vinegary |
| 7–10 | Balanced sweet-tart flavor for most palates |
| 10–14 | Strongly tart; lower sugar content |
| 14+ | Very vinegary; best used as starter liquid |
The ideal stopping point depends on personal taste. Most brewers find the sweet spot between days 7 and 10 at room temperature (20–27°C / 68–80°F).
Factors Affecting First Fermentation Time
- Temperature: Warmer environments (closer to 27°C) speed fermentation. Below 20°C, the culture slows dramatically and may stall.
- SCOBY health: A mature, well-established SCOBY ferments faster than a young or dehydrated one.
- Starter liquid ratio: Using more starter liquid (previously brewed kombucha) from the prior batch lowers the initial pH and accelerates fermentation.
- Tea type: Black tea ferments slightly faster than green tea due to higher tannin and nitrogen content.
- Sugar amount: The standard ratio is 1 cup of sugar per gallon of tea. Less sugar means less fuel for the culture.
Second Fermentation (F2): 2–4 Days
The second fermentation is optional but highly recommended if you want carbonated, flavored kombucha similar to store-bought brands.
F2 Process
- Remove the SCOBY and reserve starter liquid for your next batch.
- Add fruit, juice, ginger, herbs, or other flavorings to swing-top bottles.
- Pour strained kombucha into the bottles, leaving about 1 inch of headspace.
- Seal tightly and leave at room temperature for 2–4 days.
- Burp the bottles daily to prevent excessive pressure buildup.
- Refrigerate to halt fermentation and enjoy.
F2 Timeline by Flavor
| Flavoring | Recommended F2 Time |
|---|---|
| Fresh fruit (berries, mango) | 2–3 days |
| Fruit juice | 2–3 days |
| Ginger | 2–4 days |
| Herbs (lavender, mint) | 3–4 days |
Total Time Commitment
Active hands-on time is minimal — roughly 30–45 minutes total. The breakdown is approximately 20 minutes to brew and cool the sweet tea, 5 minutes to set up the fermentation vessel, and 10–15 minutes to bottle for F2. The vast majority of the 7–30 day process is passive waiting.
Safety Notes
Always maintain sanitary conditions, use non-reactive vessels (glass is ideal), and keep the culture covered with a breathable cloth during F1 to prevent contamination. If mold appears on the SCOBY — fuzzy, dry spots that are blue, green, black, or white — discard the entire batch and start fresh.