Why Doesn’t My Sourdough Get Oven Spring?

A loaf needs enough fermentation to contain gas, but it also needs enough remaining strength to hold that gas as it expands.
This is why both underfermented and overfermented dough can produce disappointing bread, although the results usually look different.
Underfermented dough feels dense and tight. It may rise suddenly in one area, burst along the side, or tear at the base. Inside, large tunnels often appear beside dense, gummy sections. The loaf may show some dramatic expansion, but it is uncontrolled rather than a sign of healthy fermentation.
Overfermented dough is usually very soft, sticky, and fragile. It may spread after leaving the proofing basket and lose more volume during scoring. The dough contains gas, but its gluten structure no longer has enough strength to support further expansion.
The best oven spring comes from dough that is well fermented but not exhausted. At the end of bulk fermentation, it should look aerated, feel elastic, and hold its shape without becoming weak or runny.
A sluggish starter can also limit oven spring because the dough never develops enough gas. But if the dough rose well during bulk fermentation, the starter probably did its job. In that case, look more closely at proofing, shaping, scoring, and baking conditions.

Gluten forms the network that holds fermentation gases inside the dough. If that network is weak, the loaf expands sideways instead of upward.
Weak dough may tear during stretching, spread between folds, and lose its form soon after shaping. It can be caused by insufficient gluten development, flour that is not strong enough for the recipe, or fermentation that has continued too long.
Resting the flour and water before mixing can improve hydration, while gentle folds during the first part of bulk fermentation help organize the gluten. As the dough develops, it should become smoother, more elastic, and easier to lift as one cohesive mass.
Hydration also needs to match the flour. A very wet dough can produce an open crumb, but only when the flour can support the extra water. If the dough remains loose despite mixing and folds, it may simply be too wet.
Instead of adding a large amount of flour during shaping, hold back some water at the beginning of the next bake. A slightly lower hydration often produces better height and cleaner scoring without making the bread dense.

Shaping creates a smooth, tensioned outer surface around the softer interior of the dough. This surface helps the loaf hold its form and expand upward in the oven.
If the shaping is too loose, the dough relaxes and spreads. If it is too aggressive, the surface may tear and too much gas can be pressed out.
Good shaping creates tension without squeezing the dough into a dense ball. The loaf should feel supported and cohesive, with a smooth surface and a closed seam.
Too much flour on the worktop can make shaping difficult because the dough slides instead of gripping the surface. A nearly clean section of the bench provides the gentle friction needed to tighten the loaf.
If the dough begins to tear, stop pulling it tighter. Once the outer surface is damaged, continued shaping usually weakens the loaf rather than improving it.

Final Proofing Leaves Strength for the Oven
A well-shaped loaf can still lose its oven spring during the final proof.
Underproofed dough remains tight and may burst unpredictably in the oven. Overproofed dough has already used most of its expansion and has little strength left for additional rise.
Properly proofed dough looks fuller and feels lighter than it did immediately after shaping. When gently pressed, it usually springs back slowly and leaves a shallow indentation. It should feel soft without collapsing or spreading rapidly.
The finger poke test is only one clue. Cold dough, wet dough, and whole-grain dough can respond differently. Consider the loaf’s volume, surface, movement, and the amount of fermentation that happened before shaping.
A loaf after cold proofing can usually be baked directly from the refrigerator. Cold dough is easier to score and often holds its shape better, but refrigeration cannot repair gluten that was already weak or overfermented.

A score does not create oven spring, but it controls where the loaf opens.
If the cut is too shallow, the surface may seal before expansion is complete, causing the bread to burst somewhere else. If it is unnecessarily deep, especially in soft dough, the loaf can lose support and spread.
Use a sharp blade and make one confident expansion score. A slightly angled cut encourages an ear, while a more vertical cut produces a wider, more even opening.
Decorative cuts should remain shallow. Several deep cuts can weaken the surface and send the loaf in different directions.
A dramatic ear is not the only sign of good oven spring. A well-fermented loaf may open evenly without forming a large ear, particularly when it contains whole-grain flour or is scored vertically.

The loaf needs strong heat from the moment it enters the oven.
If the oven or baking vessel is not fully heated, the dough warms too slowly and can spread before its shape sets. A Dutch oven, stone, or baking steel requires more preheating time than the oven air.
Many lean sourdough loaves are loaded at approximately 230–250°C, or 450–480°F, depending on the recipe and baking method. If every loaf has weak oven spring, a pale crust, and an unusually long baking time, the oven may be running cooler than its display suggests.
Steam keeps the surface flexible during the early stage of baking. Without enough steam, the crust forms too soon and restricts expansion.
A preheated Dutch oven traps moisture released by the dough and creates an effective steamy environment. When baking openly, steam needs to be added by another safe method. After the loaf has finished expanding, release the steam so the crust can dry and brown.

A fully proofed loaf is filled with gas and more fragile than it looks.
Roughly turning it out of the basket, pressing it with a hand, dragging it across the worktop, or making repeated scoring attempts can remove the gas needed for oven spring.
Prepare the parchment, blade, and baking vessel before removing the dough from its basket. Turn it out gently, score it without delay, and load it into the oven as quickly as possible.

Let the Finished Bread Show What Went Wrong
The shape and crumb of the baked loaf can help identify the cause.
A flat loaf with a compressed crumb and very little opening at the score often points to overproofing or weak gluten.
A loaf with large tunnels beside dense areas is more likely underfermented or underproofed.
A wide loaf with a light, open crumb may have been too wet or shaped without enough surface tension.
A loaf that bursts along the side may have been underproofed, scored too shallowly, or baked without enough steam.
A pale, thick crust combined with weak expansion can suggest insufficient heat. If the score remains narrow while the loaf tears elsewhere, the expanding dough probably found an easier escape route.
No single sign gives a complete diagnosis. Look at the loaf’s shape, the way the score opened, the crumb, and the behavior of the dough before baking.

It is tempting to search for one missing trick—a deeper score, more steam, or a hotter oven. These details matter, but they cannot replace healthy fermentation and strong dough.
Good oven spring appears when every stage supports the next. The starter produces gas, gluten holds it, fermentation fills the dough without exhausting it, and shaping creates surface tension. Final proofing leaves enough strength for expansion, while scoring, heat, and steam allow that expansion to happen in the right place.
When these elements are balanced, the dough does not need to be forced upward. It already contains everything it needs to rise.