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DOUGHRISEFOUNDERS
Baking Science
4 min read
How to Cold Proof Sourdough Properly (And Why It Makes Better Bread)
Cold proofing sourdough overnight can transform your loaf — better flavour, easier scoring, and more control. Here's how to do it properly at home.
A rustic bread dough placed on a flour-dusted dark surface, perfect for food photography needs.Cold proofing is one of those techniques that looks like a small tweak on paper but actually changes everything about the bake. Better flavour, a more open crumb, a crust that scores cleanly, and the ability to bake on your own schedule rather than hovering anxiously over a dough at midnight. Spring is actually a good time to get this dialled in, because as the kitchen warms up through April and into May, fermentation speeds up unpredictably, and having the fridge as a tool gives you back some control.
This post is for bakers who have their starter active and their bulk ferment roughly sorted, but keep ending up with loaves that are either over-proofed, under-flavoured, or just a bit flat. Cold proofing is often the missing piece, and it is more forgiving than most people think once you understand what is actually happening in there.
What Cold Proofing Actually Does
When you shape your dough and put it in the fridge, fermentation does not stop. It slows right down. The yeast becomes mostly dormant below about 4°C, but the lactic acid bacteria keep working at a reduced rate, producing the organic acids that give sourdough its complexity. This is why an overnight cold proof gives you a noticeably more developed flavour than a same-day bake. You are essentially giving the bacteria more time to do their thing without the yeast blowing the structure apart.
The cold also firms the dough up considerably, which makes it much easier to score cleanly and transfer from banneton to Dutch oven without it spreading everywhere.
Top Tip
Shape your dough with a tight enough surface tension that it holds its form, then place it seam-side up in a well-floured banneton. Cover with a shower cap or cling film and refrigerate. The fridge is not a rescue tool for poorly shaped dough, but it will hold a well-shaped loaf beautifully for 8 to 16 hours.
When to Put It in the Fridge
This is where a lot of people get confused. You do not cold proof instead of bulk fermenting. You cold proof after bulk, once the dough has been shaped. The bulk ferment should still happen at room temperature and be mostly complete before the dough goes in the fridge. A good rule of thumb is that your bulk is done when the dough has grown by around 50 to 75 percent, feels airy and domed, and passes the poke test (a gentle indent springs back slowly rather than snapping back immediately or collapsing).
In a warm spring kitchen, that might happen faster than you expect. If your bulk is running ahead of schedule and you are not ready to bake, shaping and retarding in the fridge earlier is a perfectly sensible call.
How Long Can You Leave It?
Most home bakers get excellent results between 8 and 14 hours. Beyond 16 hours you are pushing into territory where the acid load gets quite high and gluten can start to degrade, especially with higher hydration doughs. I have done 18-hour retards and they were fine, but 12 hours overnight is the sweet spot for most recipes.
If you are scaling up or running multiple loaves across a week, keeping track of timing across different doughs can get messy fast. The Doughrise Bakery plan is built for exactly that kind of multi-batch workflow, with team accounts, bakery cost reporting, and commercial batch scaling tools that make managing several doughs at once a lot more structured than a spreadsheet and a sticky note on the fridge.
Baking Straight from the Fridge
Yes, you can bake cold. In fact, for most home bakers it is preferable. A cold loaf scores more cleanly, handles more easily, and goes into a screaming hot Dutch oven without the drama. Preheat your oven and your Dutch oven to 250°C for at least 45 minutes, tip the dough straight from the fridge onto your parchment, score confidently, and get it in. The thermal shock is part of what drives oven spring.
Common Mistakes
- Putting under-fermented dough in the fridge and hoping it catches up. It will not. The cold slows everything down. If your bulk is genuinely not done, finish it at room temperature first.
- Using the fridge as a cure for a slack, poorly shaped dough. Cold proofing preserves the structure you create at shaping, so surface tension matters before it goes in.
- Not flouring the banneton generously enough. A stuck dough at 7am is a horrible way to start a Friday. Rice flour mixed with plain flour is brilliant for release.
- Covering loosely and letting the surface dry out. A dry skin on your dough resists expansion in the oven. Seal it properly.
Reading the Dough Before You Bake
Give the cold dough a gentle press before scoring. It should feel firm but not completely rigid, and there should be a slight wobble or jiggle when you shake the banneton. If it feels rock solid and dense, it may have been a touch under-fermented before it went in. If it is very soft and puffy even cold, it is on the edge of over-proof. Neither is a disaster, but knowing what you are working with helps you adjust the bake.
Getting comfortable with cold proofing takes a bake or two, but once it clicks, you will wonder how you ever managed without it. The fridge becomes your best piece of baking kit, and suddenly you are baking on your terms rather than your dough's. For more practical guides, recipes, and tools to help your baking improve steadily, have a browse at doughrise.store.
Happy baking! Find everything you need at doughrise.store
Photo by Eva Bronzini on Pexels