Why Your Sourdough Did Not Rise: 12 Causes and Fixes

📖 10 min read · Updated July 2026

By SourdoughCalc Team

Sourdough is supposed to rise. When it does not, there is always a reason. Here are the 12 most common causes, organized by when they happen in the bake, with specific fixes for each.

How to Diagnose a Loaf That Did Not Rise

Match your loaf to the symptom below. The fastest fix is usually the one that matches what you actually see, not what the recipe says.

Symptom	Most likely cause	Fastest fix
Flat and wide	Too much water or weak shaping	Lower hydration to 70-72% and build more tension
Dense and heavy	Under-bulk or weak flour	Extend bulk until the dough rises 50-75%
Gummy crumb	Cut too early or under-baked	Bake until the center reaches 205-210°F
Vinegar smell	Over-fermented or too much starter	Shorten bulk and use 15-20% ripe starter
Pale crust	Oven too cool or no steam	Preheat to 500°F and add steam
Explosive oven spring	Under-proofed final proof	Wait until the poke test leaves a slow indent

1. The Starter is Young or Weak

Symptom: Dough barely rises at all. The starter itself takes 12+ hours to peak.Fix: Use a starter that is at least 2 weeks old and reliably doubles in 4-6 hours after feeding. If your starter is slow, give it more time. Or feed it more often (every 4-6 hours) for a few days to strengthen it.

Building your first starter? Follow our 7-day sourdough starter guide.

2. Cold Kitchen

Symptom: Dough barely rises even with a strong starter. Bulk takes 8+ hours.Fix: Find a warmer spot. On top of the fridge, inside the oven with just the light on, in a cooler bag with a warm water bottle. Target 75-80°F for bulk.

3. Too Much Salt

Symptom: Slow rise, dense crumb. Salt inhibits yeast.Fix: Use 1.8-2% salt by baker's percentage. Re-measure with a scale. Salt volumes vary wildly by type.

4. Too Much Starter Inhibits

Symptom: Dough rises fast initially but collapses. Too much starter over-acidifies.Fix: Use 15-20% ripe starter. More than 25% and the dough becomes acidic and unstable.

5. Not Enough Starter

Symptom: Slow rise, weak oven spring.Fix: Use at least 15% ripe starter. Below 10% and fermentation is too slow.

6. Flour is Too Weak

Symptom: Dough spreads flat. Crumb is tight. Oven spring is weak.Fix: Use bread flour (12-14% protein) or blend with vital wheat gluten. Cake flour and pastry flour do not have enough gluten.

Need help choosing? Read our complete flour guide.

7. Too Much Water

Symptom: Dough collapses, spreads during proof.Fix: Lower hydration by 5%. Most beginners do better at 70-72% hydration than 75%+. Use our calculator to track accurately.

The full sourdough hydration guide explains why water level matters so much.

8. Bulk Fermentation Too Short

Symptom: Dense crumb, pale crust, bland flavor.Fix: Bulk for 4-6 hours at 70-75°F, or until 50-75% rise with domed top. Time alone is unreliable; watch the dough.

Our bulk fermentation guide covers timing, temperature, and visual cues in detail.

9. Over-Fermented

Symptom: Dough collapses when shaped. Strong vinegar smell. Flat loaf.Fix: Cut bulk time by 30-60 minutes. Aim for 50% rise, not 100% doubled.

10. Weak Shaping

Symptom: Spreads flat in oven. No oven spring.Fix: Build more surface tension. Use a bench scraper. Drag the dough rather than folding. See our boule shaping guide for three methods.

11. Under-Proofed Final Proof

Symptom: Dense crumb, explosive oven spring, tears in the crust.Fix: Let the final proof go longer. The poke test: poke the dough with a floured finger. If it springs back slowly and leaves a slight indent, it is ready. If it springs back quickly, it is under-proofed.

12. Oven Too Cool

Symptom: Pale, soft crust. No oven spring.Fix: Preheat to 500°F for at least 45 minutes. Use an oven thermometer. Most home ovens are 25-50°F off. A Dutch oven or pizza steel helps a lot.

The Quick Diagnostic

Flat loaf: under-proofed final proof OR over-bulk OR too much water.

Dense crumb: under-bulk OR weak flour.

Vinegar taste: over-bulk OR too much starter.

Pale crust: oven too cool OR not enough steam.

Use our hydration calculator to dial in the right hydration for your flour and conditions. The most common cause of flat/dense bread is a hydration that is too high for your flour strength.

Sourdough Did Not Rise FAQ

Why is my sourdough flat but not dense?

A flat, wide loaf usually means the dough lost structure before baking: too much water, weak shaping, or over-fermentation. Lower the hydration slightly and build more surface tension during shaping.

Can I save a dough that did not rise?

Sometimes. If the dough is under-fermented, move it somewhere warmer and wait for a 50-75% rise. If it is over-fermented, reshape it quickly and proof it in the fridge before baking.

How long should sourdough take to rise?

At 70-75°F, expect 4-6 hours of bulk fermentation and a final proof of 1-4 hours at room temperature or 8-16 hours in the fridge. Time depends on starter strength and dough temperature.