Bakeryss · Sourdough guides

Is My Sourdough Underproofed or Overproofed?

There is no single sign that proves it. A tall loaf with large holes can be underproofed, and so can a flat one; a loaf that barely rose can be overproofed or simply weak. The reliable approach is to look at several signals together — how the dough rose, how strong it felt, how it shaped, how it sprang in the oven, and what the crumb looks like — and to read them against the temperature and time you actually had.

This page is about building that picture. The goal is not to label the loaf with certainty, but to decide which direction most of the evidence points, so you know what to adjust next.

Why one symptom is never enough

Under- and over-proofing produce some of the same visible symptoms because they are both ways the dough's structure and gas are out of balance. That overlap is why "big holes always mean underproofed" and "a flat loaf always means overproofed" do not hold up.

Use each sign as a vote, not a verdict. When several votes agree, the direction is more trustworthy; when they disagree, something uneven happened in the process — a warm start and a cool finish, or a starter that was not at its strongest.

Signals while the dough is still fermenting

Most of the best information is available before the loaf is ever baked, if you watch for it:

Rise — how much the dough has grown. Useful, but the right amount depends on the dough rather than a single number.
Strength — how the dough holds together and how much tension it carries.
Extensibility — how far it stretches before it tears or springs back. Young dough is often springy; dough that has gone too far stretches and gives way.
Stickiness — dough generally gets stickier as fermentation proceeds, but hydration, flour and handling also change this, so it is a weak signal on its own.
Gas and bubbles — activity through the dough and at the surface shows fermentation is happening, not that it is finished.
Shaping — a dough that holds its shape well is usually in a good place; one that spreads the moment you handle it is weak or has gone further than you wanted.

Signals in the baked loaf

Oven spring is informative. A strong, early rise in the oven usually means the dough still had gas and strength left. A loaf that barely moves can be underproofed, overproofed or simply weak, so the spring alone does not separate them.

The crumb adds more. A tight, gummy crumb with a few larger holes near the top often suggests under-proofing. A crumb that is dense and collapsed toward the base, with a pale, fragile structure, can suggest over-proofing. These are tendencies, not verdicts — read them alongside the signals you saw during fermentation.

Use time and temperature as context

How long the dough fermented and how warm it was matter a great deal, but as context rather than as an answer. The same dough at a different temperature can need very different time, so the clock is only meaningful next to the conditions.

Compare what you observed with the conditions you actually had, not with what a recipe assumed. A "three-hour bulk" means little without knowing how warm the dough was.

Putting it together

Instead of asking "is this under or over?", ask "which direction do most of my signals point?" If rise, feel and crumb mostly agree, that direction is the better bet.

If they disagree, treat that as useful information about the process itself. It may mean the dough warmed up or cooled down partway, or that the starter was uneven. That context is what makes the next bake easier to steer.

A quick way to read the signals together:

Rise well, dough strong, crumb even — the dough was likely in a good place.
Little rise, dough tight and springy, crumb tight with a few large holes near the top — leans underproofed.
Dough slack and spreading, crumb dense and collapsed toward the base, pale crust — leans overproofed.
Signals that disagree — look at temperature changes and starter strength before choosing a direction.

What to change next

Change one thing at a time. If the evidence points to under-proofing, give the dough more time or more warmth next bake and watch whether the same signals move. If it points to over-proofing, shorten the bulk or the final proof, or keep the dough cooler.

Write down what you changed and what happened. One bake rarely settles the question, but a short record of changes turns a guess into a pattern you can trust.