Stretch and fold is the technique that replaced kneading for most modern sourdough baking. Instead of working a stiff dough on a counter for ten minutes, you do four short, gentle folds spread across the first two hours of bulk fermentation. Total active time: about three minutes. The rest of the work is done by time and the dough itself.
The technique exists because of a basic problem with high-hydration doughs: you can't knead them. A 75% or 80% hydration sourdough is too wet to lift cleanly off a counter. Try to knead it and you end up with most of the dough stuck to your hands. Stretch and fold solves this by leaving the dough in the bowl and using gravity to do the stretching.
What a fold actually does
Each fold accomplishes three things at once:
- 1.Aligns the gluten. The strands of the protein network get pulled into tighter alignment with each stretch. This is the same effect kneading produces, achieved differently.
- 2.Distributes fermentation gas evenly. Folds redistribute pockets of gas through the dough, encouraging more uniform structure rather than a few large bubbles in random places.
- 3.Equalises temperature. Sometimes the centre of a large dough mass ferments faster than the edges. Folds bring the cooler outer dough into the centre and vice versa.
How to do a single fold
Wet your hand with cold water; this prevents sticking. Reach down between the bowl edge and the dough. Grab the underside of the dough on one edge. Lift it up high enough that you can feel real tension in the dough (this is the stretching part) then fold it over the top to the opposite edge.
Rotate the bowl 90°. Repeat from the new edge. Rotate again. Repeat. Rotate one more time. Repeat. You've now stretched and folded from all four sides of the bowl. That's one set.
The whole sequence (four stretches and folds) takes about 30 seconds. Cover the bowl. Set a timer.
The four-set rhythm
The standard sourdough rhythm is four sets, spaced 30 minutes apart, performed during the first two hours of bulk fermentation.
0:00Mix dough, rest (autolyse / fermentolyse) ~45-60 min1:00Set 1. Strong stretches, dough still slack1:30Set 2. Noticeable improvement, more cohesive2:00Set 3. Dough holds shape better2:30Set 4. Gentler folds, dough is well developed2:30+No more folds, just fermentation through end of bulk
The standard four-set timeline for a typical sourdough country loaf at room temperature.
What changes between sets
The dough you fold at Set 1 feels nothing like the dough you fold at Set 4. Reading these changes is a useful skill.
Set 1: slack and reluctant
The dough has had only the autolyse to develop gluten. It's still slack, slightly sticky, sometimes hard to grab cleanly. Stretches feel short; the dough doesn't want to extend far before tearing. This is normal. Fold all four sides anyway, even if each stretch only goes 4–6 inches before the dough wants to release.
Set 2: noticeably stronger
After 30 minutes of rest, the gluten has reorganised. The dough should already feel more cohesive. Stretches go further (8–10 inches) without tearing. Surface looks smoother; you can see a thin skin forming on top.
Set 3: holds shape between folds
By Set 3, the dough should hold a defined dome shape in the bowl after each fold rather than spreading out flat. The stretches feel powerful; the dough wants to spring back. You may see the first signs of fermentation: small bubbles dotting the surface.
Set 4: gentle, almost ceremonial
By Set 4 the dough is well developed. The folds at this point are more about distributing gas than building gluten. Use lighter pressure and shorter stretches; aggressive folds at this stage can deflate the gas you've built up. Some bakers skip Set 4 entirely if the dough is already very strong.
How hard to fold
The most common mistake is folding too gently throughout. Set 1 and Set 2 should involve real stretching: pull the dough to the point where you feel substantial resistance before folding it over. If your stretches go only 4 inches before the dough flops back over without tension, you're not building gluten.
Sets 3 and 4 should be progressively gentler as the dough's already-developed structure means strong folds risk tearing. Match the force to where the dough is: strong early, gentle late.
How to know when to stop
Four sets is a starting convention, not a rule. If your dough is still slack after Set 4 (slumps flat in the bowl, doesn't hold shape), do a fifth set 30 minutes later. If your dough is already strong by Set 3 (holds shape, springs back, smooth surface), skip Set 4.
Two reliable signs that gluten is well developed:
- 1.The dough holds its dome shape in the bowl after a fold, rather than spreading out.
- 2.When you stretch a small piece (the windowpane test), it goes thin without tearing immediately.
What to do after the folds end
Stop folding when the gluten is developed. The remainder of bulk fermentation (typically another 2–4 hours) happens without interruption. The dough sits, ferments, builds gas, and develops flavor. Don't disturb it.
This is where most beginners mess up. They keep folding throughout bulk fermentation "to be safe." Each fold past the point of gluten development deflates accumulated gas without building further structure. By the end of bulk you've worked against yourself.
Common variations
Lower-hydration doughs
For sourdoughs at 65% hydration or below, you can knead instead of folding; the dough is firm enough to lift cleanly. Many bakers still prefer folds for consistency, but kneading isn't wrong at lower hydrations.
Very high hydration (above 80%)
Switch to coil folds (covered in the next article). Standard stretch-and-folds become impractical above about 82–83% hydration; the dough tears more than it stretches. Coil folds are gentler and more appropriate for slack doughs.
Slap and fold
An alternative for moderate-hydration doughs (65–75%). Take the dough out of the bowl, slap it onto the counter, fold it over itself, and repeat: this is the Bertinet method. More aggressive than bowl folds, faster gluten development, but messier and harder on high-hydration doughs.
What stretch-and-fold doesn't replace
Folding is a substitute for kneading, not for fermentation time. A perfectly folded dough that hasn't fermented enough still produces dense bread. The folds build the structure that holds the gas; they don't produce the gas itself.
A common beginner pattern is to do four sets of beautiful folds and then bake too early because the dough "looks ready." Looking ready (well-developed gluten) and being ready (well-fermented) are different things. The bulk fermentation article covers the second.
Cook mode can hold each fold as its own timed step, so stretch-and-folds and coil folds do not disappear into one vague bulk-fermentation note. Add notes to the step if you changed the fold style, timing, or dough feel.
The takeaway
Four sets, 30 minutes apart, during the first two hours of bulk fermentation. Strong early, gentle late. Stop when the dough holds its shape between folds. After folds end, leave the dough alone for the remainder of bulk fermentation. Total active time: about three minutes for the entire technique.