What is Oven Spring?

Oven spring happens because heat accelerates yeast fermentation in the dough's outer layers before the inside sets. Yeast produces CO₂ faster in warm conditions, and the dough's gluten stretches one last time before the proteins coagulate and trap the gas. You'll see this most clearly in artisan bread: a sourdough boule that looks tight and compact at 4:45 PM suddenly opens up and gains height by 5:00 PM. That 15-minute window is when oven spring does its work. Why does this matter to your bottom line? A 500g dough that achieves strong oven spring yields a finished loaf that weighs 520-540g and sells for $6.50. The same dough with weak oven spring yields 480-500g and looks dense — you might only sell it for $4.50, or not sell it at all. Over a week of baking 60 loaves, the difference between strong and weak oven spring is $480 in lost revenue. Oven spring depends on three things: steam in the oven, dough temperature at bake time, and gluten strength. Steam keeps the crust flexible during those first 10-15 minutes, so the dough can expand without cracking. A dough that enters the oven at 26°C will spring more than one at 22°C because yeast ferments faster in warmer dough. And if your gluten isn't developed enough — if you've underworked the dough or used weak flour — the dough can't hold the gas expansion, and you get a flat, dense loaf. Bakers often confuse oven spring with proofing. Proofing is what you do before the oven — you let the dough rise at room temperature until it's puffy and nearly doubled. Oven spring is what happens in the oven, and it's the last 10-15% of the loaf's final volume. You can't get that back if you over-proof: an over-proofed dough goes into the oven already gassy, the gluten is exhausted, and it collapses under its own weight instead of springing.