Guide
Autolyse vs. Fermentolyse: When to Rest Your Dough — and When to Skip It
An autolyse is just flour and water, resting. Add your starter to the rest and it's a fermentolyse — the acid in the starter softens the dough faster. Skip both when your flour can't afford to lose any strength.
The classic autolyse (Professor Calvel's idea) is flour and water, nothing else. As the flour hydrates, the gluten relaxes just enough that you skip a long mix. Salt stays out because salt tightens everything back up. Starter stays out because its acid speeds the softening.
A fermentolyse puts the starter in the rest. You get a head start on flavor and a stretchier dough — but bulk starts early too. Ninety minutes of "rest" on a high-extraction flour, with all that acid working, is how a strong dough turns to soup.
The flour hydration ceiling still wins. No rest can create gluten the mill didn't put in the bag. Check the Flour Index before you start a timer.
Which rest fits your flour
Pick one rest. Don't stack a long autolyse and a fermentolyse. The dough only has so much gluten to give.
| Process | In the bowl | Protease | pH | Window | Use when | Skip when |
|---|---|---|---|---|---|---|
| Skip | Flour, water, levain, salt — one mix | Just the mixing | Stays where the flour is | 0 min | Rye, 00 pizza, stiff bagels, already-slack AP | — |
| Autolyse | Flour + water. Levain and salt out. | The flour's own enzymes, no acid yet | ~6.0–6.2 (flour) | 20–45 min | Strong patent bread flour, baguettes, wet country | Whole grain, high extraction, weak AP |
| Long autolyse | Flour + water, often cold | Hours of softening, nothing holding it back | Slow, still near flour | 2–12 h (cold) | Very strong hi-gluten, rare | Almost every home bag; never warm overnight |
| Fermentolyse | Flour + water + levain. Salt out. | Enzymes plus starter acid | Falls toward 5.2–4.5 | 20–40 min | Daily sourdough on bread flour | Rye, Type 82, young/slack levain, long warm bulk after |
Three rules that keep you out of trouble
1 · Flour first
Time the rest to the bag, not the blog. Strong bread flour (King Arthur bread, ABC Plus, Peak Performer): 20–45 min autolyse. High-extraction and whole wheat: 15–20 min or skip — the bran is already cutting the gluten. Rye: skip. Tipo 00 pizza: skip or under 15 min. Look up your bag in the Flour Index before you start a timer.
2 · Acid is the accelerator
A fermentolyse turns the acid up right away, and acid softens dough faster. Thirty minutes on bread flour: a useful tool. Ninety minutes on Type 82: soup. Never run a long autolyse and then a fermentolyse — pick one rest. If the starter is late and already sour, shorten the rest or skip it. The acid is already in the jar.
3 · Salt is the brake — skip if it is already slack
Salt firms the gluten back up and slows the softening, so hold it until the rest is over. If the dough is already slack the moment you touch it — wet mix, weak flour, rye blend — there is nothing left to relax. Just mix it, salt it, build strength, fold. Resting a puddle is just waiting.
How the calculator handles it
The sourdough calculator holds back about 8% of the water as a reserve, rests the flour with the rest, then mixes in the levain, salt, and reserve together. That's a short autolyse — the acid and salt arrive at mix time, not during the rest. If you'd rather do a fermentolyse, add the levain at the rest and hold the salt for the mix — and keep it to 20–40 min on bread flour.