How to Tell When Sourdough Bulk Fermentation Is Finished

Bulk fermentation is one of the most important—and most confusing—parts of sourdough baking. The clock can help, but the dough itself gives the best answer. Kitchen temperature, starter strength and dough temperature all change how quickly fermentation moves.

Look for a 50–75% Rise

For most beginner loaves, the dough is ready to shape after it has risen approximately 50–75%. In a warm South Georgia kitchen, I often shape closer to 50% because fermentation continues during shaping and the early part of the cold proof.

Watch the Surface and Sides

Ready dough looks puffier and smoother than freshly mixed dough. You may see bubbles along the sides and underneath the surface. The edges often appear slightly rounded where the dough meets the container rather than dense and flat.

Check the Jiggle

Gently move the container. Properly fermented dough should have a soft, lively jiggle. It should feel aerated and elastic rather than heavy, tight or soupy.

Signs It Needs More Time

Give the dough more time when it still looks dense, has little visible rise, feels tight and shows very few bubbles. Check it again in 20–30 minutes, especially in a warm room.

Signs It May Have Gone Too Far

Overfermented dough may feel very loose, sticky and difficult to shape. It can spread quickly after being turned out and may have an overly fragile surface. Shape gently and bake it anyway—every loaf teaches you something.

For a complete guided path from starter to first loaf, visit our Sourdough Made Simple Beginner Bootcamp on the Workshops page.