Troubleshooting Gummy Sourdough Bread

This is the sourdough problem that hurts the most. You waited two days. You shaped carefully. You got beautiful oven spring and a gorgeous crust. You waited (impatiently) for it to cool. You sliced into it and, the crumb is gummy. Wet. Sticky. It clumps on the knife and smushes instead of slicing cleanly. It is heartbreaking.

But gummy crumb has specific causes, and every single one of them has a fix. Let us work through them systematically so you can diagnose your specific issue and solve it for your next bake.

Cause 1: You Cut Into It Too Soon

I am putting this first because it is the most common cause by far. When bread comes out of the oven, the interior is still technically baking. Residual heat continues to set the crumb, and moisture is redistributing from the center outward. If you cut into the loaf before it has fully cooled, a process that takes at least one to two hours for a standard boule, the crumb will feel wet and gummy even if it is technically fully baked.

The fix: Wait. I know it is hard. The smell is incredible. But set a timer for 2 hours and walk away. The bread will still be slightly warm after 2 hours, which is the perfect eating temperature. Cutting earlier means gummy crumb, no exceptions.

Cause 2: Underbaking

A sourdough loaf can look done on the outside, deep brown crust, hollow sound when tapped, while the interior is still doughy. This is especially common in Dutch oven baking, where the enclosed environment can darken the crust quickly while the center is still catching up.

The fix: Use an instant-read thermometer. Your bread is done when the internal temperature reaches 205 to 210°F (96-99°C). Not 190°F, not 200°F, those are temperatures for enriched breads. Lean sourdough needs to hit at least 205°F. If the crust is getting too dark before the interior is done, tent with foil and keep baking.

Cause 3: Overproofing

An overproofed dough has exhausted its gluten structure. The proteins that normally set during baking and give the crumb its structure have been weakened by excess acid and enzyme activity. The result is a crumb that never fully sets, it stays gummy and wet even when fully baked and cooled.

The fix: Learn to read your dough during bulk fermentation. A properly fermented dough has increased in volume by 50 to 75 percent, feels airy and bouncy, and shows bubbles on the surface. An overproofed dough has more than doubled, feels slack and deflated, and smells sharply acidic. If you suspect overproofing, err on the side of shaping earlier next time.

Cause 4: Too Much Water

High-hydration doughs (above 80%) produce more open, custardy crumbs that can feel gummy to people accustomed to lower-hydration bread. There is a difference between intentionally custardy crumb and accidentally gummy crumb, but if you are new to sourdough and consistently getting wet-feeling interiors, your hydration might be too high for your flour or your skill level.

The fix: Drop your hydration by 5% and see if the problem resolves. There is no shame in baking at 70 to 72% hydration, the bread will still be excellent, and it is much easier to handle. You can always experiment with higher hydration later as your skills develop.

Cause 5: Your Flour Cannot Handle the Hydration

Not all flours are created equal. Some bread flours can absorb 80% hydration beautifully. Some all-purpose flours struggle above 68%. Whole wheat flours absorb more water than white flour but release it differently during baking. If you changed flours recently and suddenly started getting gummy results, the flour is likely the culprit.

The fix: When switching flours, start at a lower hydration than your recipe calls for and adjust upward gradually. Every flour has its own sweet spot, and you need to find it through experience.

Cause 6: Insufficient Gluten Development

If the gluten is not adequately developed during mixing and stretch and folds, the dough cannot build the structure needed for a well-set crumb. Undermixed or under-folded doughs produce bread that is dense and gummy in the center.

The fix: Make sure your dough passes the windowpane test before moving to bulk fermentation. If you are skipping stretch and folds, start doing them, 4 to 6 sets over the first 2 hours of bulk fermentation makes a significant difference in crumb structure.

Gummy crumb is frustrating, but it is a solvable problem. Work through this list, make one change at a time, and keep baking. For related troubleshooting, check out why your sourdough is flat and fixing dense crumb.