Sourdough that won’t rise in the oven often lacks enough strength in the starter or the oven temperature is too low. If you’re asking why is my sourdough not rising in the oven, the answer usually comes down to a few fixable issues with your starter, dough, or baking setup. The good news is that most of these problems are easy to spot once you know what to look for.
This guide walks you through the common causes and gives you simple steps to fix them. Let’s get your loaf to spring up the way it should.
Why Is My Sourdough Not Rising In The Oven
Oven rise, also called oven spring, happens in the first 10 to 15 minutes of baking. The heat causes gases in the dough to expand and moisture to turn into steam. If your loaf stays flat, something is blocking that process.
Here are the main reasons your sourdough isn’t rising in the oven.
Your Starter Is Weak Or Underactive
The starter is the engine of your bread. If it’s not strong, the dough won’t have enough gas to rise.
- Your starter doesn’t double in size after feeding
- It smells like acetone or nail polish remover
- There are no bubbles on the surface or through the jar
- It’s been in the fridge too long without feeding
Fix this by feeding your starter twice a day for two or three days before baking. Use it when it’s at its peak, roughly 4 to 8 hours after feeding.
Your Dough Is Over Proofed
Over proofing is one of the most common reasons for a flat loaf. When dough sits too long, the yeast runs out of food. The gluten structure also breaks down.
Signs of over proofed dough:
- It spreads out instead of holding its shape
- The surface looks flat and bubbly
- It feels sticky and weak when you touch it
- It doesn’t spring back when you poke it
Next time, shorten your bulk ferment or cold retard. Watch the dough, not the clock.
Your Dough Is Under Proofed
Under proofed dough is dense and heavy. It may rise a little in the oven but then stall. The inside stays gummy.
- The dough feels tight and stiff
- It springs back fast when poked
- The crumb has big tunnels near the top
Give it more time at room temperature before shaping. A warm spot helps speed things up.
Your Oven Temperature Is Too Low
Oven spring needs high heat. If your oven runs cool, the dough won’t get the burst of energy it needs.
Most sourdough bakes best at 450°F to 500°F (230°C to 260°C) for the first part of baking. Use an oven thermometer to check the real temperature. Many ovens are off by 25 to 50 degrees.
You’re Not Using Steam
Steam keeps the crust soft during the first minutes of baking. This lets the loaf expand freely. Without steam, the crust sets too fast and traps the rise.
Use a Dutch oven with the lid on for the first 20 minutes. Or place a pan of boiling water on the bottom rack.
Your Shaping Is Too Loose
If you don’t build enough tension during shaping, the dough spreads instead of rising up. A tight, well-shaped boule holds its structure in the oven.
- Pre-shape the dough and let it rest 20 minutes
- Shape again with firm, confident movements
- Create surface tension by pulling the dough toward you
- Place it seam side up in a floured banneton
How To Fix A Sourdough That Won’t Rise
Here’s a simple checklist to run through before your next bake.
- Feed your starter and wait until it doubles
- Use a warm spot for bulk fermentation, around 75°F to 80°F
- Watch the dough for a 50 to 75 percent rise, not a full double
- Shape with tension and cold proof for 12 to 16 hours
- Preheat your oven and Dutch oven for at least 45 minutes
- Bake at 475°F with the lid on for 20 minutes
- Remove the lid and finish at 450°F until deep brown
Check Your Flour Choice
Flour matters more then most bakers think. Bread flour or a strong all-purpose flour gives better gluten development. Weak flour makes a slack dough that can’t hold gas.
- Use bread flour with 12 to 14 percent protein
- Avoid cake flour or pastry flour for sourdough
- Whole wheat and rye absorb more water, so adjust hydration
Watch Your Hydration Level
High hydration dough is harder to handle. If your dough is too wet, it spreads and won’t rise well. Beginners should start around 65 to 70 percent hydration.
If your dough feels like soup, add a little flour during mixing. If it feels stiff and dry, add a splash of water.
Give It More Time To Ferment
Cold kitchens slow everything down. If your house is under 68°F, your dough may need double the time. Use a proofing box or place the bowl in your oven with the light on.
Don’t rush the process. Sourdough rewards patience.
Final Thoughts On Oven Spring
A sourdough that won’t rise in the oven is usually telling you something. Maybe the starter needs more food. Maybe the dough proofed too long. Maybe the oven is running cold.
Work through each cause one at a time. Keep notes on your bakes so you can spot patterns. With a few small tweaks, your next loaf should puff up with a proud, open crumb.