Sourdough Not Springing in the Oven: 5 Real Causes

Short answer: poor oven spring traces back to weak fermentation, weak shaping, or insufficient steam — usually in that order. The oven is rarely the problem.

What "no oven spring" looks like

You load a beautifully proofed loaf into a 500°F Dutch oven, expecting that dramatic 30% expansion. Instead you get:

• A loaf that's the same size as it went in
• A flat top
• A score that didn't open
• No ear

The 5 causes

1. Over-proof

The most common cause. The dough produced gas, but by the time it hit the oven, the gluten was too weak to expand any further.

Symptoms:

• Finger dent doesn't spring back at all
• Score doesn't open
• Loaf looks slack going in

Fix: bake at 50–60% rise (visible) instead of 100%.

2. Weak shaping

A loaf without surface tension can't push outward. Even with great fermentation, slack shaping means slack spring.

Build tension:

• Pre-shape into a tight ball
• Rest 30 minutes
• Final shape: drag the dough across the counter to build a taut skin
• Place seam-down in basket

The dough should feel firm and smooth on top after shaping.

3. Oven not actually hot

Home ovens lie. The dial says 500°F; the oven might be 440°F.

Test: put an oven thermometer on the rack. Preheat for 60 minutes. Read the actual temperature.

If it's underreading by 50°F, set the dial to 525°F (or whatever offsets to true 500°F).

4. Under-fermented dough

If the dough didn't ferment enough, there's not enough gas to expand. Spring requires fuel.

Symptoms:

• Dough barely rose during bulk
• Crumb is tight everywhere
• Sourness is faint

Fix: extend bulk by 60–90 minutes.

5. Vessel not preheated

A Dutch oven needs 60 minutes at 500°F to fully saturate. If you preheat 30 minutes, the bottom is cool and the loaf bakes in a tepid environment.

Always preheat 60 minutes minimum.

The role of steam

Steam keeps the crust flexible during the first 15 minutes. Without steam:

• Crust sets in 3 minutes
• Spring stops because the crust can't stretch
• Score doesn't open

For Dutch oven: lid handles steam. For sheet pan: steam tray + boiling water + tightly closed oven.

A bake to maximize spring

Recipe:

• 500g bread flour
• 350g water (70%)
• 100g starter, peaked
• 10g salt

Method:

• Mix, bulk 5h at 75°F, 4 folds
• Pre-shape, rest 30 min
• Final shape with tension
• Cold retard 12 hours
• Preheat Dutch oven 60 min at 500°F
• Score deep at 30°
• Bake covered 20 min
• Uncover, bake 22 min

A 75% hydration dough with these conditions will spring 25–30%.

A spring diagnostic

Take a phone video of the dough being loaded and the bread coming out of the oven 20 minutes later (when you remove the lid). The before/after height comparison is your diagnostic.

If the loaf is the same height: cause is upstream (over-proof or weak shaping). If the loaf rose but the score didn't open: shallow scoring or insufficient steam. If the loaf rose well and tore on the side: fine spring, just bad scoring direction.

Score depth multiplies spring

A loaf with a deep, clean score springs more visibly than the same loaf with a shallow score. The deep score creates a path for expansion; the shallow score prevents it.

Score 1–1.5cm deep at a 30° angle.

Don't open the oven

Heat loss in the first 10 minutes kills spring. Don't peek. Don't reposition. Don't rotate.

After 20 minutes, when the crust has set, you can open to remove the lid. Before then, every door open costs you spring.

Spring is multifactorial

If your loaves don't spring, work through:

1. Bulk fermentation: did dough rise visibly?
2. Shape: was the dough tight on the counter?
3. Cold retard: was it cold-firm coming out of the fridge?
4. Vessel: 60-minute preheat?
5. Score: deep, decisive, at 30°?
6. Door: closed for the first 20 minutes?

Six yes answers equals reliable oven spring.

When spring is fine but the loaf still looks flat

A loaf that springs vertically and lands at 50% wider than it went in is "spreading," not "not springing." Spread is a different problem — over-hydration or weak shaping. The fix is tighter shape and slightly lower hydration.

Diagnosis is everything. Identify what "no spring" means in your bake before treating it.