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Get temperature-adjusted fermentation times for sourdough, yogurt, sauerkraut, kombucha, beer, and more. Includes built-in countdown timer.
Fermentation is a metabolic process where microorganisms (yeast, bacteria) convert sugars into acids, gases, or alcohol. Temperature is the primary variable controlling fermentation speed — warmer environments accelerate microbial activity while cooler ones slow it.
Ideal: 75–82°F
| Type | Time | Temp °F |
|---|---|---|
| Sourdough Starter | 4h–12h | 75–82 |
| Bread Dough (Bulk) | 2h–5h | 75–80 |
| Cold Retard (Dough) | 8h–3d | 38–42 |
| Yogurt | 6h–12h | 108–115 |
| Sauerkraut | 3d–30d | 65–75 |
| Kimchi | 1d–7d | 65–75 |
| Kombucha (1st) | 7d–21d | 72–85 |
| Beer (Primary) | 7d–14d | 60–72 |
| Kefir | 12h–2d | 65–78 |
| Tempeh | 1d–2d | 85–90 |
Formula
Adjusted Time ≈ Base Time × (1 − 0.03 × ΔT)ΔT = difference between actual and ideal temperature (°F)
Base Time = standard fermentation time at ideal temperature
Worked Example
Sourdough bulk ferment at 82°F vs ideal 78°F
Did you know? The oldest known fermented food is a 9,000-year-old Chinese rice wine discovered in Jiahu. Fermentation was likely discovered accidentally when wild yeasts colonized stored grains or fruit (source: Proceedings of the National Academy of Sciences).
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