How long does sourdough bulk fermentation take?

Bulk fermentation time depends heavily on kitchen temperature. At 72°F it takes approximately 4.5–5.75 hours. At 68°F expect 6–7.5 hours. At 76°F as little as 3.5–4.5 hours. Temperature is the single biggest variable — always watch the dough, not the clock.

Should I do a cold proof or same-day proof for sourdough?

Cold proof (overnight in the refrigerator) is recommended for most bakers. It's more forgiving, produces better flavor through extended fermentation, and makes the dough easier to score cold. Same-day proofing is faster but requires more precise timing and produces a milder loaf.

When should I feed my sourdough starter before baking?

Feed your starter 4–8 hours before you plan to mix your dough, depending on kitchen temperature. At 72°F, a 1:5:5 ratio feed will peak in approximately 5–7 hours. Use the starter when it's domed and just starting to show signs of falling — at maximum activity.

Bake Schedule Builder.

Tell it when you want fresh bread. It tells you everything else — when to feed your starter, when bulk finishes, when to shape, when to sleep. Adjusts in real time as your kitchen temperature changes.

What these timings assume Temperature is the biggest lever, and it always was. Your flour blend and how much starter you use are the next two, and this page now asks for both — set them below and every timing moves with them. The same engine runs Choose Your Own Crumb, so the two tools agree on the same dough.

What it still cannot know is your exact formula. Hydration is assumed around 70%, and fat, sugar, dairy and acid all slow a dough down without appearing here — if you're baking something enriched or sour, build it properly and read the timings off that instead.

Either way, treat these as a starting estimate, not a stopwatch. The dough decides — reading the bulk covers the four signals that actually tell you when it's done.

I want fresh bread on

day

time

Kitchen temperature

72 °F

bulk fermentation at this temp 4.5–5.75 hrs

64°F · cold 72°F · typical 86°F · hot

Your flour blend

Whole grain and rye ferment faster than white. Picking the right one here moves every timing below. For an exact formula rather than a bracket, build it in Choose Your Own Crumb.

How much starter

5% · very slow 20% of flour weight 35% · fast

Proof method

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Your bake — visual timeline

Step-by-step schedule

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