What You’ll Learn
- How underproofing looks in dough.
- How it appears in crumb.
- Why large tunnels can be misleading.
- How temperature slows fermentation.
- How to correct it next time.
Quick Answer
Underproofed sourdough often has limited rise before baking, a tight crumb, large isolated tunnels and strong unpredictable oven expansion. The fix is usually more fermentation time or a warmer dough—not simply more folding.
This lesson is part of our Troubleshooting section: “Fix the most common sourdough problems.”
What Underproofing Means
The dough has not produced and retained enough gas before baking.
Before Baking
The dough may feel dense, tight and less aerated than expected.
Crumb Signs
A tight crumb with a few large tunnels is a classic pattern.
Oven Behaviour
Underproofed loaves can burst or tear because expansion is happening too late.
Why It Happens
Cold dough, weak starter or following a short fixed timetable are common causes.
How to Fix It
Allow more bulk fermentation and judge rise, bubbles and texture together.
From Our Workshop
Huge holes do not always mean ‘open crumb’. In an otherwise dense loaf, they can be a sign of under-fermentation.
Bake Slower Tip
If the dough still feels heavy before shaping, give it more time.
Common Mistake
Do not compensate for underproofing by doing more folds late in bulk.
Today You Learned
- Underproofed dough is not fermented enough.
- Dense crumb with tunnels is common.
- Cold dough may simply need longer.
- Oven bursting can be a clue.
- More fermentation is usually the fix.
Frequently Asked Questions
Can I bake underproofed dough?
Yes, but the crumb may be tight.
Does the poke test show underproofing?
It is only one clue.
Can starter strength cause it?
Yes.
Why are there huge holes?
Gas may have collected unevenly in an otherwise under-fermented dough.
Will longer cold proof fix it?
Sometimes, but bulk progress still matters.
Make the Next Bake Easier
Give the dough the fermentation it needs rather than the number of hours the recipe promised.
Continue Learning
Next lesson: Why Does My Sourdough Have Large Holes?
Troubleshoot one variable at a time
Diagnose from the whole loaf, not one symptom. Compare dough strength, fermentation, proofing, scoring and bake together. Changing several stages at once can hide the real cause and make the next result harder to interpret.