Should sourdough double during bulk fermentation?

Not always. The appropriate rise depends on the recipe, dough temperature, flour and remaining proof. Many recipes call for shaping before doubling. Follow the recipe's target and assess the dough's other signs of readiness.

How long should bulk fermentation take?

It depends on temperature, starter activity, inoculation and the formula. Start with the recipe's estimated window, then use measured rise and dough observations to decide when to shape.

Is the poke test useful during bulk fermentation?

The poke test is more commonly used as one clue during final proofing. During bulk, measured rise, visible aeration, texture and temperature usually provide a clearer combined picture. No single test replaces the recipe's guidance.

How to tell when bulk fermentation is done

Bulk fermentation is ready when the dough has developed the rise and structure your recipe calls for. Use a combination of measured growth, bubbles, texture and dough temperature. Elapsed time is a useful reference, but it is not a readiness test on its own.

Know when your bulk stage begins

Bulk fermentation generally starts when starter is incorporated into the dough and ends when the dough is divided or shaped. An earlier flour-and-water rest without starter does not count toward that fermentation time. Check how your recipe defines its stages so you compare the same thing each bake.

Folds happen during bulk, so their time usually belongs within the overall fermentation window. Counting bulk only after the last fold can accidentally extend fermentation well beyond the recipe's intention.

Measure the rise you can actually see

A transparent, straight-sided container helps you follow expansion. Mark the starting level after mixing and compare the dough against that mark. In a bowl with sloping sides, a change in height does not translate neatly to the same percentage change in volume.

Use the rise target in your recipe. Some doughs are shaped well before doubling, especially when they will continue fermenting during a long final proof. Flour choice, dough strength and temperature affect the appropriate target. There is no single percentage that works for every loaf.

Read several signs together

As fermentation progresses, look for bubbles at the sides and beneath the surface, a more aerated feel and a dough that moves with some lightness when the container is gently shaken. The top may look slightly rounded rather than flat and dense. These signs vary with hydration and flour, so compare them with your own earlier doughs.

A very loose dough may spread without holding a dramatic dome. A whole-grain dough may feel and look different from a strong white-flour dough. Avoid repeatedly pressing or stretching the dough just to inspect it; observation should not become extra handling.

Compare growth with the starting mark and the recipe's target.
Look for aeration through the dough, not just a few surface bubbles.
Consider the dough temperature and the remaining proofing plan.
Use elapsed time as context for these observations.

Adjust the plan, then learn from the loaf

Dough in a cool kitchen often needs more time. If growth is limited and the dough still feels dense, make another check rather than shaping automatically when the timer sounds. If the dough is advancing faster than expected, reassess sooner instead of waiting for the scheduled finish.

Record the temperature, approximate rise and actual bulk duration before shaping. After baking, add a crumb photo and your notes. A dense crumb or a spreading loaf can have several causes, so avoid diagnosing fermentation from one photo alone. Change one manageable variable on the next bake and compare the result.