The stretch-and-fold technique replaces kneading in sourdough. You don't develop the gluten by working the dough on a counter for ten minutes; you develop it by gently lifting and folding the dough over itself a few times during the first half of bulk fermentation. Done right, it's the easiest dough-handling technique in baking. Done wrong, or skipped, it's a common cause of dense, flat loaves.
Here's what's actually happening, how many folds you need, when to stop, and how to scale folds to your flour, your hydration, and your kitchen temperature.
What folding does
Mixing combines flour and water and starts forming gluten, long chains of protein that trap fermentation gas. But the gluten formed during mixing alone is disorganized. The strands are tangled, weak, and uneven.
Folding aligns them. Each fold stretches the dough, lengthening the protein chains and pulling them parallel. Repeated folds layer aligned gluten on aligned gluten. After three or four sets, the dough has organized structure capable of holding its shape, expanding upward instead of outward, and trapping gas in a way that produces an open crumb.
You're not forcing strength into the dough by kneading. You're letting it develop strength on its own and just helping it organize.
How to do a stretch-and-fold
Wet your hands lightly. Reach under one side of the dough, lift it up until it stretches as far as it'll go without tearing, and fold it over the center. Rotate the bowl 90 degrees. Repeat three more times for a complete set of four sides. Cover the bowl and walk away.
That's one "set." Most schedules call for four sets, 30 minutes apart, during the first half of bulk fermentation, which the model puts at about the first 2½ hours at 24°C (75°F); the 30/60/90/120 schedule finishes inside it. All of them can be done right in the bulk container with a wet hand, without touching a counter.
When to do them, and how kitchen temperature moves the window
The standard schedule, with timing measured from when you mixed in the salt and started bulk, for a dough around 24°C (75°F):
- Set 1: 30 minutes in. The dough is sticky and the folds feel rough. Normal.
- Set 2: 60 minutes in. Noticeably smoother. Gluten is starting to organize.
- Set 3: 90 minutes in. Smooth, supple, holds shape between folds.
- Set 4: 120 minutes in. Should feel taut, almost springy, holding the folded shape for a full minute before relaxing.
After the last set, leave the dough alone for the rest of bulk.
The rule underneath those times: finish folding within the first half of bulk. Two clocks set the window. The spacing between sets is mechanical: the dough needs 20–30 minutes to relax before the next fold can stretch new structure, and that barely changes with temperature. The end of the window is a fermentation clock: once the dough has built up real gas, folding knocks it out instead of organizing around it. Kitchen temperature moves that second clock. A warm 26°C (79°F) dough might finish bulk in roughly four hours while a cool 20°C (68°F) dough takes seven or more (the full curve is in bulk fermentation by temperature).
So a cool kitchen gives you more room to space your sets, not a reason to add more, and a hot kitchen squeezes the same sets into less time. What you shouldn't do at any temperature is fold into the second half of bulk, when the gas you'd be disrupting is the gas that will raise the loaf.
Fold timing by dough temperature: the model's numbers
The schedule calculator predicts bulk from dough temperature and levain percentage: about 5 hours at 24°C with 20% levain, 2.2x slower for every 8°C cooler. Halve that prediction and you have the latest point your folds should reach. The table assumes 20% levain. These are model estimates, not measurements, and the dough's own rise still decides when bulk is done.
| Dough temp | Bulk, 20% levain (model) | First half ends | Practical fold plan |
|---|---|---|---|
| 18°C (64°F) | ~9 h | ~4.5 h | Sets about an hour apart, done by ~4 h |
| 21°C (70°F) | ~6.7 h | ~3.4 h | Sets 45–60 min apart, done by ~3 h |
| 24°C (75°F) | 5 h | 2.5 h | The 30/60/90/120 schedule above |
| 27°C (81°F) | ~3.7 h | ~1.9 h | Sets 20–25 min apart, done by ~1.5 h |
Finish a little before the halfway mark rather than right on it, so the last stretch of the first half is undisturbed. At 27°C (81°F) that means starting the first set at around 20 minutes; if four sets won't fit, three firmer ones plus a longer initial mix will do. Less levain stretches every row: at 10% levain the model adds about 32% to each bulk time, and the fold window with it. Put your own dough temperature and levain into the calculator and it gives you the bulk length to halve.
How many folds is "right": by hydration
Most home recipes call for four sets. That's the workable default, but the right count depends on hydration and on how strong your flour is. Wetter dough is slacker and needs more sets to build the same structure; drier, stronger dough gets there faster.
| Hydration band | Recommended sets | Fold type | Timing at ~24°C (75°F) |
|---|---|---|---|
| 60–65% (stiff) | 2 sets | Standard stretch-and-fold | At 30 and 60 min |
| 65–72% | 3 sets | Standard stretch-and-fold | At 30, 60, 90 min |
| 72–80% | 4 sets | Standard stretch-and-fold | At 30, 60, 90, 120 min |
| 80–85% | 4–5 sets | Coil folds (gentler) | Every 25–30 min, done by ~135 min |
| 85%+ (very wet) | 5–6 sets | Coil folds | Every 20–25 min, done by ~135 min |
The signal isn't really the number; it's the dough. You stop when it's smooth, glossy, holds its shape when poked, and resists being pushed out of shape. If a 78% dough still feels slack after four sets, add a fifth. If a 68% dough feels strong after two, you can stop early. The table is a starting point; the dough has the final say. In a warmer or cooler kitchen, keep the set count and compress or stretch the timing to fit the first half of bulk, as in the temperature table above. (For why these hydration numbers behave the way they do, see hydration explained.)
"Bread flour" vs "strong bread flour": same thing
A quick clarification, because the labels cause real confusion across recipes. "Strong bread flour" is the British term for what Americans simply call "bread flour." Both mean a high-protein wheat flour, roughly 12–14% protein, milled for the long gluten development that bread needs. "Strong" refers to gluten strength, not anything added. So when a UK recipe says strong white bread flour and a US recipe says bread flour, they're calling for the same product, and the fold counts above apply to both.
What behaves differently is all-purpose flour (around 10–11% protein). It develops less structure, so a dough made with it stays slacker for longer and often wants an extra set compared to the same hydration in bread flour. If your folds feel like they're not "taking," check whether you're using bread flour; that's often the culprit rather than fold technique.
Stretch-and-fold vs coil fold
The basic stretch-and-fold works well up to about 80% hydration. Above that, the dough is wet enough that lifting it from underneath drags through the mass and tears it.
For wetter doughs, switch to coil folds: with wet hands, lift the dough from the center straight up, letting the two ends drape down and tuck under as the middle rises. Set it down, rotate 90 degrees, and lift again. The dough folds under itself: same alignment, far less pulling and tearing. Most recipes for very high-hydration loaves (85%+ ciabatta, pan de cristal) specify coil folds for exactly this reason.
What if you skip folds entirely
Skip folds in a 75% country loaf and you get a flat, dense, structurally weak loaf. You can feel it: the crumb won't open and the shape won't hold. Fermentation still works fine, but without organized gluten, gas escapes sideways instead of pushing the crumb upward. This is one of the quiet causes behind dense sourdough that bakers blame on their starter.
For very low-hydration doughs (under 60%) you can sometimes get away with no folds, because the dough is stiff enough to hold structure on its own. For nearly every sourdough you'll actually bake, fold.
Folding and bulk timing
Folding doesn't speed up or slow down fermentation. It changes the structural quality of the bread, not the chemistry. So if your dough finished at 24°C (75°F) with 20% levain, the model's bulk is about five hours whether you fold three times or five.
What folds do change is when bulk looks done. A well-folded dough holds gas and shows visible rise sooner, so you might hit the 50% rise mark a touch earlier than the clock predicts. A poorly folded dough leaks gas as fast as it makes it and may never visibly reach 50% rise even at the correct proof time, which leads people to overferment, chasing a rise the structure can't hold. If you judge by a domed surface, bubbles on the sides of the container and a jiggly, airy feel when you nudge it, rather than by volume alone, weak folds will fool you less.
Common mistakes
Folding too late. All your sets belong in the first half of bulk, about the first 2½ hours at 24°C (75°F) by the model. Folding into the second half breaks down accumulating gas structure.
Folding too aggressively. Stretch until the dough is about to tear, not past it. Tearing breaks the gluten you're trying to build.
Using the same clock in every season. A 27°C (81°F) dough reaches the halfway point of bulk before the two-hour mark, so a 30/60/90/120 schedule folds into gas it should be keeping. Scale the window to your dough temperature.
Skipping a set because the dough already looks good. Tempting at the 90-minute mark, but the dough you get from a full schedule is noticeably stronger than one set short.
Using a dry counter for high-hydration coil folds. The dough sticks and tears. Wet hands, fold in the bowl.
Folding after bulk has effectively ended. Once the dough is at about a 50–75% rise from when the salt went in, pre-shape and bench rest come next, not more folds.
Common questions
Can I fold every 30 minutes instead of spacing some out to an hour?
Yes, and for wet doughs (80%+) you should: coil folds every 25–30 minutes are the standard there, so they all fit inside the first half of bulk. For 70–78% doughs the half-hour vs full-hour spacing barely matters, as long as the last set still lands in the first half of bulk; what matters is that the dough gets 20–30 minutes to relax between sets so each fold actually stretches new structure rather than fighting a tight dough.
My kitchen is cold (18°C, 64°F). Should I do more folds or spread them out longer?
Spread them out, but don't add more. At 18°C (64°F) the calculator's model predicts about 9 hours of bulk with 20% levain, so the first half runs to roughly 4.5 hours and your sets can sit about an hour apart. A cold dough also relaxes more slowly between folds, so the longer spacing suits it. The set count stays tied to hydration and flour; cold changes the timing, not how much structure the dough needs. See winter sourdough for handling a cold kitchen end to end.
How do I know if I've folded enough?
The windowpane idea, adapted: gently stretch a corner of the dough between two sets. Early on it tears almost immediately. By your last set it should stretch thin enough to see light through before it tears, and the whole mass should hold a domed shape when you stop folding instead of slumping flat. That's "enough"; more folds past that point don't add anything.
Does fold count change with whole wheat or rye?
Yes. Whole wheat dough often wants one extra set because bran cuts through gluten as it hydrates, so the structure builds and degrades at the same time (details in whole wheat sourdough). Rye is the opposite extreme: it has almost no gluten to align, so folding does little. For high-rye dough you mix until uniform and skip folds entirely (rye sourdough rules).
Can I overdo it and damage the dough?
Yes, in two ways. Folding past your last scheduled set, deep into bulk, tears apart gas pockets that have already formed. And folding too hard at any stage rips gluten instead of stretching it. More sets early is forgiving; aggressive or late folds are not.
Do folds replace shaping?
No. Folds build structure during bulk; shaping at the end of bulk builds surface tension on a single loaf and sets its final form. They're different jobs at different stages. Folds make the dough strong enough that shaping actually works.
Make the last set count
If you only nail one set, make it the last one. By your final fold the dough has had over an hour to develop, and that's the set that tells you whether bulk is on track: it should come together taut and springy and hold its folded shape for a full minute. If it still spreads and slumps at that point, the dough is either too wet for the fold count you've done (add a set) or your flour is weaker than you thought.