Why Your Sourdough Bread Has No Oven Spring (And How to Fix It)

If your sourdough loaf is coming out flat with no rise in the oven, what you’re missing is something called oven spring.

Oven spring is that final push your dough gets in the first part of baking—when the heat hits and your loaf should lift, expand, and open up beautifully.  We call this the bloom on the belly. 

If that’s not happening, something earlier in the process is holding your dough back.

Let’s walk through the biggest reasons—and how to fix them.

How Do you Achieve Sourdough Oven Spring?

Oven spring is that beautiful rise your loaf gets in the first 10–15 minutes of baking. It’s not just one thing—it’s the result of multiple factors working perfectly together. 

Optimal oven spring happens when:

• Heat causes gases in the dough (CO₂ + steam) to expand rapidly
  
• Yeast gives a final burst of activity before dying (~60°C)

• Steam keeps the crust soft long enough for expansion to bloom the belly and create the ear

Strong oven spring comes from the balance of fermentation, structure, and heat. Start with a strong, active sourdough starter and ferment your dough properly—under-proofed dough will burst unpredictably while containing un even crumb structure and dense spots, while over-proofed dough won’t rise at all due to lack of gluten structure. Building good gluten strength through mixing and stretch and folds, and shaping the dough tightly to create surface tension that supports upward rise. Finally, bake in a very hot oven with steam (like a Dutch oven) and score with confidence to control expansion—this is what gives you that beautiful lift and ear.

Scoring (the slash) is what controls and directs oven spring.  Use a proper bread lame with a sharp blade, as a clean, precise cut prevents dragging and allows the dough to expand freely for optimal oven spring. When your dough hits the hot oven, pressure builds quickly from expanding gases and steam. If there’s no weak point, that pressure will escape wherever it can—causing random ruptures or a flatter loaf. The score creates a planned weak spot, telling the bread exactly where to expand - and directs where the belly blooms and the ear forms.

A proper score—done at a shallow angle of approximately 45 degrees, with enough depth—also helps lift a flap of dough (the “ear”). As the loaf expands, that flap peels back and allows for maximum upward rise instead of spreading sideways.  Scoring doesn’t create oven spring—it guides it, turning that internal pressure into height, structure, and that signature open bloom.

10+ Tips to better Oven Spring

Sourdough Starter Strength

One of the biggest factors is the strength of your starter. Your starter is what fuels your dough, and if it isn’t active and reliable, your bread won’t have enough energy to rise in the oven. A strong  and robust sourdough starter should double in size within a few hours of feeding, look full of large bubbles, and feel light and airy. If it’s sluggish, overly sour, or inconsistent, your dough will struggle no matter how well you follow the rest of the process. If your starter feels unpredictable, starting with a mature, established starter can make a huge difference.

Consistent  and proper feeding techniques is what contributes to a strong, reliable sourdough starter.  Using a scale for accuracy and the proper flour will always offer the best and most consistent results.  You can view my Ultimate Guide to Sourdough Starter Feeding Ratios for information on how higher ratios of food affect starter peak times.  following a clear step-by-step feeding process can help take the guesswork out of  it — especially for beginners. Using a high-protein bread flour also plays a big role, as it provides more nutrients for the wild yeast and bacteria to thrive. The result is a starter that’s more active, more predictable, and better able to support a strong rise in your dough.  

Dough Strength

Another key piece is dough strength. Your dough needs enough structure to trap and hold the gas created during fermentation.  Building dough strength through stretch and folds is essential for achieving good oven spring because it develops and organizes the gluten network without overworking the dough. Each set of stretch and folds gently aligns the gluten strands, creating a strong, elastic structure that can trap and hold gas produced during fermentation. This strength allows the dough to expand upward in the oven instead of spreading out, resulting in better rise, improved shape, and a lighter, more open crumb.

Proper bread flour plays a major role in dough strength because of its higher protein content (typically around 12–14%). That protein forms stronger gluten networks when hydrated, giving the dough more elasticity and structure. This added strength helps the dough hold onto gas during fermentation and expand upward in the oven, resulting in better oven spring, improved shape, and a more open crumb.

Shaping & Surface Tension (This Is a Big One)

Even if your dough is perfectly fermented, poor shaping can completely flatten your results.  Shaping is what creates surface tension—that tight outer “skin” on your dough that holds everything together and directs the rise upward instead of outward. Without enough tension, your dough will relax, spread, and bake into a wide, flat loaf instead of lifting in the oven.

You might notice this if your dough looks great during bulk fermentation but flattens out as soon as you turn it onto the counter or after you shape it. That’s usually a sign that the structure wasn’t built tightly enough during shaping.  The goal isn’t to handle the dough aggressively—it’s to gently tighten it. Creating tension along the surface helps trap gas and gives your loaf the strength it needs for that final rise.

Proofing baskets (banneton brotforms) can also help support your dough during its final proof, especially if you’re still learning how to shape consistently.  Using a brotform helps your dough hold its shape and maintain structure during final cold proofing.  Made from wood pulp, a breathable material, also wicks away excess moisture, creating a slightly drier outer layer that makes scoring cleaner and allows the loaf to rise upward more effectively in the oven.

Fermentation

Fermentation timing also plays a major role. If your dough hasn’t fermented long enough - referred to as under proofed, it won’t have built up enough gas to expand in the oven. This often leads to a dense crumb and very little rise.  Under-proofed sourdough dough occurs when fermentation has not progressed far enough, meaning there is insufficient gas development and the gluten structure has not fully relaxed. Visually, the dough will feel tight, dense, and be mostly resistant to stretching, with very little jiggle. When gently pressed, it springs back quickly without leaving much of an indentation. During baking, this dough often expands too rapidly and unevenly, causing blowouts or tearing along the sides rather than opening cleanly at the score. The final loaf typically has a dense, tight crumb with small holes and may appear slightly gummy inside.

On the other hand, if your dough ferments too long, it can become weak and over proofed, causing it to collapse rather than spring.  Over-proofed sourdough dough has fermented too long, causing the gluten structure to weaken and begin breaking down (your sourdough culture eats the protein from the flour  and that protein is responsible for gluten and strength development!) . The dough will appear very soft, slack, and sticky, often spreading out rather than holding its shape. When pressed, the indentation remains or even collapses further. In the oven, this dough lacks the strength to trap expanding gases, resulting in little to no oven spring and a loaf that spreads outward instead of rising upward. The finished bread is usually flat, with a pale crust and either large, uneven holes or a collapsed interior.

 Learning to read your dough—looking for signs like bubbles, volume increase, and a soft, slightly jiggly texture—is much more reliable than watching the clock.

Scoring

Scoring (the slash) is what controls and directs oven spring.  Use a proper bread lame with a sharp blade, as a clean, precise cut prevents dragging and allows the dough to expand freely for optimal oven spring. When your dough hits the hot oven, pressure builds quickly from expanding gases and steam. If there’s no weak point, that pressure will escape wherever it can—causing random ruptures or a flatter loaf. The score creates a planned weak spot, telling the bread exactly where to expand - and directs where the belly blooms and the ear forms.

A proper score—done at a shallow angle of approximately 45 degrees, with enough depth—also helps lift a flap of dough (the “ear”). As the loaf expands, that flap peels back and allows for maximum upward rise instead of spreading sideways.  Scoring doesn’t create oven spring—it guides it, turning that internal pressure into height, structure, and that signature open bloom.

Steam

Steam in the oven is essential for achieving strong oven spring because it keeps the outer surface of the dough soft and flexible during the early stages of baking. This delay in crust formation allows the expanding gases inside the dough to push upward creating the belly, resulting in better rise, volume, and that signature open bloom. Without steam, the crust sets too quickly, limiting expansion and leading to a flatter loaf.

Home bakers can create steam by baking in a covered Dutch oven, which traps natural moisture, or by adding hot water or ice to a preheated baking vessel. However, not all baking vessels are designed to handle sudden temperature changes—adding ice to certain Dutch ovens or ceramic cookware can cause thermal shock and lead to cracking—so it’s important to use steam methods that are safe for your equipment.

Temperature

Temperature ties everything together when it comes to oven spring. Your oven must be fully preheated—typically to 475–500°F (245–260°C)—so the dough is hit with an immediate, intense burst of heat. This rapid heat exposure causes the gases inside the dough to expand quickly while giving the yeast a final surge of activity before it becomes inactive, both of which drive the initial rise. If the oven isn’t hot enough, this reaction is slower and weaker, resulting in reduced oven spring and a denser loaf.

Baking your dough straight from the fridge after a cold proof can further improve oven spring because the cooler dough is firmer and easier to score cleanly. It also holds its shape better when it first enters the oven, preventing it from spreading before the structure sets. This allows the heat to push the dough upward instead of outward, leading to a taller loaf with better volume and a more defined ear. Combined with proper steam and scoring, high heat and cold dough work together to maximize rise, structure, and overall loaf quality.

Some bakers experiment with a “cold start,” where the dough is placed into a cold Dutch oven and heated gradually with the oven. This method is somewhat controversial, as it can still produce good results but often lacks the same immediate burst of heat needed for maximum oven spring. Because oven spring relies heavily on rapid gas expansion in the first few minutes of baking, starting in a fully preheated oven is generally more reliable and consistent, especially for achieving strong rise and a defined ear.

Using the Proper Tools

Starting with a well-designed sourdough kit can also make a big difference, especially in the early stages when everything feels new. Instead of piecing together tools and guessing what you actually need, a pre-formed kit gives you the essentials that are meant to work together—from a reliable starter to the right tools for mixing, shaping, and baking. It removes a lot of the trial and error and helps create consistency right from the beginning, which is key for building confidence and getting that strong, reliable rise in your bread.

Using the right tools can make a noticeable difference in your sourdough results, especially when it comes to oven spring. Even small upgrades can improve consistency, heat retention, and overall dough performance. For example, switching to a higher-quality Dutch oven often leads to better oven spring because it holds heat more evenly and traps steam more effectively—but it’s usually not just one tool making the difference. It’s the combination of everything working together. The flour you choose plays a role in dough strength, your tools influence structure and environment, and each piece supports the final result. When your setup is consistent and reliable, your dough responds the same way, and that’s when you start to see that strong, predictable rise.

At the end of the day, sourdough isn’t about perfection—it’s about understanding the process. If your bread isn’t rising the way you want it to, it’s usually a sign that something small needs adjusting, whether that’s your starter strength, fermentation timing, or shaping technique. Once those pieces start to come together, everything becomes more consistent, and baking sourdough starts to feel a lot more enjoyable and predictable.