Russell Groves
2026-03-03T15:59:51+00:00

Overproofed vs Underproofed Sourdough: How To Tell The Difference

Understanding overproofed vs underproofed sourdough is one of the most misunderstood stages in sourdough baking. Many dense, flat or uneven loaves can be traced back to proofing that was either too short or too long. Using the right sourdough tools also makes judging fermentation much easier.

Understanding the difference between overproofed and underproofed sourdough makes troubleshooting much easier. Small timing adjustments often lead to noticeable improvements.

What Is Proofing?

Proofing is the final rise that happens after shaping.

During this stage:

• The dough continues fermenting

• Gas builds inside the structure

• Flavour develops further

Proofing can happen at room temperature or in the fridge. Either method works, but the timing must match the dough’s strength and temperature.

Underproofed Sourdough

Underproofed sourdough has not had enough time to ferment during the final rise.

Common signs include:

• Dough feels tight and firm

• It springs back quickly when pressed

• The loaf tears unpredictably in the oven

• The crumb is dense with small, tight holes

In the oven, underproofed dough often rises aggressively but in an uneven way. You may see blowouts along the sides where the crust splits instead of opening cleanly along the score.

If this happens, extend final proof slightly on your next bake.

Overproofed Sourdough

Overproofed sourdough has fermented too long during the final rise.

Common signs include:

• Dough feels very soft and slack

• It spreads easily when turned out

• It does not spring back when gently pressed

• Surface tension is difficult to maintain

In the oven, overproofed dough often bakes flatter with limited oven spring. The crumb may appear compressed near the base.

Using a banneton during proofing helps support soft dough, but it cannot compensate for excessive fermentation.

The Finger Test

A simple way to judge proofing is the gentle press test.

Lightly press the dough with a floured finger.

If the indentation springs back quickly, it is likely underproofed.

If it springs back slowly and partially, it is close to ready.

If it barely springs back at all, it may be overproofed.

This test is not perfect, but it becomes more reliable with practice.

How Temperature Affects Proofing

Temperature plays a major role in proofing speed.

In a cooler UK kitchen, final proof may take longer than expected. In warmer conditions, fermentation speeds up significantly.

Refrigerated proofing slows fermentation and gives you more flexibility. Many bakers prefer overnight proofing because it improves flavour and makes scoring easier.

How Shaping And Bulk Fermentation Affect Proofing

Proofing does not happen in isolation.

If bulk fermentation was too short, final proof may need more time. If bulk went too far, proofing may move quickly and risk over fermentation.

Strong shaping with good surface tension helps the dough hold its structure during proofing. A dough scraper can assist with controlled shaping before placing the loaf into a banneton.

Each stage influences the next.

How To Fix Proofing Issues

If your loaf was underproofed:

• Extend final proof slightly

• Check starter strength

• Make sure bulk fermentation was complete

If your loaf was overproofed:

• Reduce final proof time

• Monitor room temperature more closely

• Refrigerate earlier to slow fermentation

Adjust one variable at a time so you can clearly see what improves the result.

Final Thoughts

Overproofed vs underproofed sourdough is not about strict timing. It is about recognising the condition of the dough.

Pay attention to how it feels, how it responds to touch and how it behaves when turned out of the banneton.

With practice, judging proofing becomes far easier. Small refinements at this stage often lead to better oven spring, improved structure and a more consistent crumb.

Consistency comes from observation and repetition, not rigid schedules.

If you are still refining your process, reliable sourdough tools can make judging proofing far easier.