2026-09-05

Why You Got No Oven Spring

A loaf that comes out the same height it went in was out of gas before it hit the oven. That's overproofing, not an oven problem — here's how to tell and how to fix it.

Your dough was out of gas before it went in the oven. That's overproofing, and it's not an oven problem.

What you're seeing

You slid a rounded dough into the oven and pulled out something the same height, or flatter. No dome. The scoring line barely opened — it spread sideways into a shallow crack instead of blooming upward. The crumb is even and a little tight, maybe with a dense band near the base.

Nine times out of ten, the loaf also felt slack and sticky when you turned it out of the banneton, and it spread on the peel or parchment instead of holding its ball.

Same dough, same oven. Which loaf came out of yours?

No spring. The gas was already spent.

What the heat does

It widens instead of rising: 12% wider and 3% taller 18 minutes after loading at 450°F (230°C). 3% is measurement noise, not spring. Watch it against the clock underneath: there is no moment where it moves fast, because there is nothing inside pushing. Steam still forms, but it leaves through walls that hours of fermentation had already thinned, so the only direction left is outward into the vessel, under its own weight.

The one fix

End bulk fermentation earlier, and judge it by volume rather than the clock: 50–75% growth and a jiggle as one mass. At 78°F (26°C) that is 4–5 hours; at 68°F (20°C) the same dough takes 7–9 hours; at 82°F (28°C) it can be done in 3.

All three went into the same vessel, preheated at 500°F (260°C) for 45–60 minutes and dropped to 450°F (230°C) on load. The oven is not the variable. When you stopped fermenting is.

The cause: fermentation was already finished

Oven spring is the last 10 to 15 minutes of fermentation, run at high speed.

When dough hits heat, three things happen at once. The yeast, which had been working at room temperature, gets a final burst of activity as the dough warms through roughly 100–120°F (38–49°C) before the heat kills it. The CO₂ already dissolved in the dough's water comes out of solution and expands. And the water in the dough turns to steam, which expands about 1,600 times in volume. All of that pushes outward on a gluten network that is still stretchy but is being set into place by the heat. The result is the sudden 20–30% rise you see in the first eight minutes.

Every part of that requires gas and gas-holding capacity that the dough still has left. Overproofed dough has neither. The yeast has consumed the available sugars, so there's little final burst. The gluten has been degraded by protease enzymes and acid over hours of fermentation, so the walls between bubbles are thin and leaky. The gas that does expand escapes instead of lifting.

So the loaf doesn't spring. It relaxes.

The fix

Right now, for the next loaf: shorten the bulk ferment and judge it by volume, not by the clock. Bulk is done when the dough has grown 50–75% and jiggles as one mass. At 78°F (26°C) that's roughly 4–5 hours with a healthy starter. At 68°F (20°C) the same dough takes 7–9 hours. At 82°F (28°C) it can be done in 3. A recipe that gives you hours without giving you a temperature is giving you half the instruction.

Then shape and get it cold. A shaped loaf that goes into the fridge at 38–40°F (3–4°C) within 20 minutes of shaping stops fermenting fast, which is exactly what you want if you're prone to going long. Bake straight from the fridge.

The poke test at bake time: press a floured finger half an inch into the shaped loaf. Springs back fully and fast means it needs more time. Springs back slowly and leaves a shallow dent means bake it. Doesn't spring back at all, and the dent stays as a crater, means you're already past it — bake immediately and accept a flatter loaf.

Cause two: not enough steam

If your ferment was good and the loaf still didn't rise, look at steam.

Steam keeps the crust surface damp for the first part of the bake. A damp surface stays flexible, so it can keep stretching while the inside expands. A dry surface sets into a rigid shell within a couple of minutes and caps the loaf. You get a pale, tight, cracked top and no height.

The fix is a lid. Bake covered for the first 20 minutes in a dutch oven at 450°F (230°C), then uncovered for 20–25 minutes at the same temperature. If you're baking on a stone, put a metal pan on the oven floor and pour in 1 cup (240 ml / 8 oz) of boiling water as the loaf goes in, and don't open the door for 20 minutes. Ice cubes work too. A spray bottle does not — the water evaporates in seconds.

Cause three: the oven or the vessel wasn't hot enough

This is the one beginners blame first and it's the one that's actually true least often. But it does happen, and it happens most with a cold dutch oven.

Preheat the oven to 500°F (260°C) with the dutch oven inside for a full 45 minutes to 1 hour. Ovens signal "ready" when the air hits temperature, which takes 15 minutes. Cast iron and thick ceramic take three times that long to saturate with heat, and the vessel is what actually drives the spring from below. Drop to 450°F (230°C) once the loaf is in.

An oven thermometer costs about $8 and settles the question permanently. Home ovens routinely run 25–50°F (14–28°C) off their dial.

The counterintuitive one: violent spring with a tear

If your loaf sprang hard but ripped open along one side, or blew a large cavern just under the top crust, that's the opposite problem. Underproofed dough has an enormous amount of unspent gas and a tight, strong gluten network. It expands with real force and finds the weakest point in the shaping seam, then tears there rather than opening at the score.

That's not fixed by more heat or more steam. It's fixed by a longer bulk ferment, a deeper score — half an inch, one confident stroke — and tighter shaping so there's no weak seam to blow out.

Is it saveable?

The loaf in front of you, no. Nothing you do after the bake adds height. But an overproofed loaf is genuinely good food: the flavor is more developed than an underproofed one, and it slices well for toast, grilled cheese, croutons, panzanella, or bread pudding. A flat loaf is a scheduling error, not a wasted bake.

The next loaf, yes, and easily. Overproofing is the most reversible mistake in bread, because the only thing you change is when you stop.

Something else wrong?

Start at the diagnosis hub if you're not sure which one you have.

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