Sourdough Timeline Generator
Pick when you want bread ready. The calculator works backward through every step.
How to use this calculator
Set the time you want your bread finished, pick same-day or overnight retard, enter your kitchen temperature, and choose a starter ratio. The calculator works backward from your target and outputs a clock-time schedule for every step — from feeding your starter all the way through to pulling the loaf from the oven.
Same day runs through every phase in one stretch. It works well for weekend bakes or days when you can check on dough periodically. Expect the timeline to start very early if you want bread by dinner. Overnight retard splits the work across two days: you mix, bulk ferment, and shape on day one, then refrigerate overnight and bake fresh the next morning.
The sourdough baking timeline
Every sourdough loaf moves through the same phases. Understanding what happens at each stage helps you read the dough and adjust when the clock does not match reality.
Feed starter. Your starter needs to be at peak — doubled in size, domed, bubbly throughout — when you mix the dough. The time this takes depends on the feeding ratio and temperature. A 1:1:1 feed at 72°F peaks around 6 hours. A 1:5:5 feed at the same temperature takes roughly 15 hours. Use our starter feeding calculator for precise estimates.
Mix and autolyse. Combine flour, water, and peaked starter. Some bakers autolyse (rest flour and water before adding starter and salt) for 20–60 minutes. This calculator assumes a 20-minute mix-and-autolyse window.
Bulk fermentation. The longest active phase. The dough sits at room temperature while yeast and bacteria do their work. You perform stretch-and-folds every 30–45 minutes during the first half to build gluten structure. Bulk is done when the dough has grown 50–75% in volume, feels airy and jiggly, and shows bubbles on the surface and sides.
Shape. Turn the dough out, pre-shape into a loose round, let it rest 10 minutes, then final-shape into a boule or batard. Place it seam-side-up in a floured banneton or bowl lined with a towel.
Proof. If baking same-day, proof at room temperature until the dough passes the poke test — press a floured finger into it, and if the indent springs back slowly but not all the way, it is ready. For overnight retard, cover the banneton and refrigerate immediately after shaping.
Bake. Preheat your oven (ideally with a Dutch oven inside) to 450–500°F for at least 45 minutes. Score the dough, transfer it to the hot vessel, and bake covered for 20 minutes, then uncovered for another 20–25 minutes until the crust is deep golden brown and the internal temperature reaches 205–210°F.
How temperature controls everything
Fermentation speed roughly doubles for every 15°F increase. At 80°F, bulk fermentation may take just 3.5 hours. At 65°F, the same dough needs 8 hours. This is why the timeline shifts dramatically with even small temperature changes. If your kitchen runs cool, you can place the dough near a warm appliance or inside an oven with just the light on. If it runs hot, watch for over-fermentation — the dough will be slack, sticky, and hard to shape.
Same-day vs overnight retard
Same-day is straightforward but front-loaded. You need to feed your starter hours before you plan to mix, and the bake finishes late in the day. It works best when your schedule is flexible.
Overnight retard splits the labor. Day one is mixing, fermenting, and shaping — active work spread across the afternoon and evening. The shaped dough goes into the fridge at night and cold-proofs for 10–14 hours. Day two is a quick bake: straight from fridge to oven with minimal wait. The cold proof also develops deeper, more complex flavor and makes scoring easier because the dough is firm.
Tips for fitting a bake into your day
Choose the starter ratio that matches your schedule, not the other way around. If you need a fast turnaround, use 1:1:1. If you want to feed in the morning and mix after work, use 1:5:5. Use the hydration calculator to dial in your water ratio once you have your schedule sorted. And remember: the timeline is a guide. Sourdough has survived for thousands of years without stopwatches.
Frequently asked questions
How accurate are these times?
They are estimates based on temperature and starter ratio. Every flour, every starter culture, and every kitchen behaves a little differently. Use the timeline as a planning framework, but watch your dough — it will tell you when it’s ready. Bulk fermentation is done when the dough has grown 50–75% in volume, not strictly when the clock says so.
What if my kitchen temperature changes during the day?
Use the average temperature. If your kitchen is 68°F in the morning and 76°F in the afternoon, entering 72°F will give you a reasonable estimate. The timeline will not be perfect, but sourdough is forgiving within 30–60 minutes.
Can I shorten bulk fermentation?
Higher temperatures speed up fermentation. Folding the dough does not shorten bulk, but it improves gluten structure and gas distribution. If you need a faster schedule, raise the temperature or use a smaller starter ratio so the starter peaks sooner.
What is cold retard and why would I use it?
Cold retard means shaping your dough and putting it in the fridge overnight (10–14 hours). The cold slows fermentation almost to a halt, letting you bake fresh in the morning. It also develops more complex, tangy flavor. Most artisan bakeries use cold retard for exactly this reason.
Does the starter ratio affect my schedule?
Significantly. A 1:1:1 feed peaks in about 6 hours at 72°F. A 1:5:5 feed takes roughly 15 hours. That difference pushes your entire timeline earlier. Choose a ratio that fits your schedule — not the other way around.
What if I miss a timing window by an hour?
Sourdough is forgiving. If bulk runs an extra 30–60 minutes, your dough may be slightly more fermented but still bakeable. Adjust the next step to compensate rather than rushing. The only stage where timing is tight is the oven — do not walk away from a hot Dutch oven.