How to Read Your Dough: The Signs That Tell You Bulk Fermentation Is Done

⏱ 4 min read

There is a moment in every sourdough bake where you are standing in the kitchen, staring at a bowl of dough, and genuinely unsure whether it is ready. The recipe said six hours. It has been six hours. But does that mean it is done? Not necessarily. Time is a guide, not a rule, and bulk fermentation is probably the step where most home bakers go wrong without even realising it.

Under-fermented dough gives you a dense, gummy crumb that tears instead of slicing. Over-fermented dough collapses when you try to shape it and bakes flat. Getting this right is genuinely one of the most useful skills you can develop, and the good news is it comes down to a handful of clear, repeatable signs rather than guesswork.

This one is for bakers who have got the basics down but still feel uncertain about that bulk fermentation window. Spring is actually a great time to dial this in, because warming kitchens mean faster fermentation, and you will start to notice the differences more clearly when things are moving at a reasonable pace.

Look at the Volume First

The most commonly cited marker is a 50 to 75 percent increase in volume. It is a useful starting point, but it is not the whole picture. A straight-sided container (a large Cambro or even a tall storage tub) makes this much easier to judge than a mixing bowl. Mark the starting level with a rubber band or a piece of tape. When the dough has risen to somewhere between halfway and three-quarters above that mark, you are in the right zone.

In a warm spring kitchen, around 22 to 24 degrees Celsius, this might happen in four to five hours with an active starter. In a cooler room it could take eight or more. Watch the dough, not the clock.

Check the Texture and Feel

Volume alone is not enough. Give the dough a gentle wobble. Properly fermented dough has a jiggly, almost pillowy quality to it, with visible bubbles near the sides and surface. It should feel airy and light when you move the container, not dense and sluggish like it did at the start.

When you do the final fold or coil fold before shaping, the dough should feel noticeably stronger and more elastic than it did three folds ago. It should hold its shape briefly rather than spreading immediately. That structure is gluten and gas working together, and it is a good sign.

Look at the Surface

The surface of the dough tells you a lot. You want to see a slightly domed top, bubbles breaking through, and a texture that looks almost sponge-like around the edges where the dough meets the container. If the top is flat or starting to look slack and deflated, you have probably gone a bit too far.

A surface that looks smooth and tight but with no visible bubble activity usually means it needs more time, especially if the dough still feels quite dense when you move it.

The Poke Test (Use It Sparingly)

Wet a finger and gently poke the dough about one centimetre deep. If the indent springs back slowly and mostly fills in, bulk fermentation is on track. If it springs back immediately, give it more time. If it barely springs back at all and just sits there deflated, it has gone over.

It is not a perfect test, and I would not rely on it alone, but used alongside the visual cues above it helps build a more complete picture.

Getting a Feel For It Over Time

Honestly, the best thing you can do is bake consistently with the same starter and flour so you start to recognise patterns. If you are just getting started or restarting after a break, having a reliable, well-established starter makes a real difference to how predictably fermentation behaves. Our Classic Sourdough Starter is ready to feed and bake with straight away, which removes one variable while you are learning to read the others.

The more you bake, the more intuitive this becomes. You will start to recognise what your dough looks like at four hours versus six hours, and you will stop second-guessing yourself. That confidence is what separates a stressful bake from an enjoyable one, and spring is a brilliant time to build it with longer days and a kitchen that is finally warming up again.

For more practical guides, recipes, and baking tools head over to doughrise.store.

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Photo by Stephen Han on Unsplash