Sourdough Temperature Guide
Fermentation speed is temperature-dependent. A 4-hour bulk at 76°F becomes 6 hours at 68°F — and 3 hours at 82°F. Multipliers below from Modernist Bread vol 3.
Timing calculator
- Multiplier at 76°F
- 1×
- Adjusted bulk ferment
- 4 h
- Adjusted final proof
- 12 h
How the math works
Multipliers are piecewise-linear interpolations between reference points measured by Myhrvold et al. in Modernist Bread vol 3. 76°F is the baseline (1.0×); every 10°F drop roughly doubles fermentation time, and every 10°F rise roughly halves it.