Guide

Temperature changes everything: the lacto-fermentation speed multiplier

Home kitchens vary from 55°F basements in winter to 80°F apartments in summer. Fermentation time changes accordingly — same recipe, different clock. This guide covers the temperature bins, the speed multipliers, and the safety boundaries.

What this guide covers

  1. Why temperature matters: LAB metabolism is exponential
  2. The 68°F baseline and the Q10 doubling rule
  3. Temperature bins from cold-retard (36°F) to mould-risk (90°F)
  4. Adjusting recipe times with the speed multiplier
  5. Mould risk above 82°F and the 'kahm' yeast threshold
  6. Cold-cellar fermentation: deeper flavour, longer keep
  7. Practical: where to ferment in a too-warm kitchen

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