Dough and proofing

Bulk fermentation and final proof: how long, and how to tell the dough is ready

Updated October 2026 · 2 min read

Proofing decides more about the loaf than any recipe. The clock gives you a frame; the dough has the final say.

Two rises, two jobs

Bulk fermentation is the rest of the whole dough after mixing. This is where flavour and structure develop and the dough becomes airy. The final proof is the second rise after shaping: the shaped loaf rises once more before it goes into the oven.

How long bulk fermentation takes

Dough temperature sets the pace more than anything else. For a wheat sourdough with about 20 % starter, these are rough values:

Dough temperature	Bulk fermentation about
21–22 °C (70–72 °F)	5–7 hours
24 °C (75 °F)	4–5 hours
26–27 °C (79–81 °F)	3–4 hours

More starter speeds it up, less slows it down. How to hit a target dough temperature is covered in Working out water temperature.

In the first half of bulk you build strength: two to four sets of stretch and folds, 30–45 minutes apart. After that, leave the dough alone.

How to tell bulk is done

The volume has grown by about half, with some doughs by three quarters.
The surface is domed, with bubbles at the sides and on top.
The dough jiggles when you shake the bowl and pulls away from the sides more easily.

A clear container with straight sides and a mark at the start make the rise easy to see.

The final proof

At room temperature the final proof usually takes one to three hours. Alternatively, the shaped loaf goes into the fridge for 8–16 hours and is baked the next morning. That brings more flavour and a crust that is easier to score.

The poke test: press a floured finger about a centimetre into the loaf.

The dent springs straight back: too early.
It fills slowly and stays slightly visible: just right.
It stays put or the dough sinks: over-proofed. Bake right away – the loaf will be flatter, but perfectly edible.

Cold dough from the fridge always springs back a little more slowly, so the test tells you less there.

Too short or too long

Under-proofing shows as a dense crumb with a few large holes under the crust, and a loaf that bursts open at the side. Over-proofing gives a flat loaf that spreads, with evenly small holes and a distinctly sour taste.

Common questions

Can bulk fermentation go on too long?

Yes. If the dough has much more than doubled, is sticky and collapses when you shape it, it went too long. Shape it gently and keep the final proof short.

Can I do bulk fermentation in the fridge?

Yes, that is called a cold bulk. After the stretch and folds the dough goes into the fridge for 12–24 hours, is shaped afterwards and then has a shorter final proof at room temperature.

Does this apply to rye bread?

Only partly. Pure rye doughs are not stretched and folded, rest only briefly after mixing and do most of their rising in the final proof. Cracks on the surface tell you the loaf is ready for the oven.