Fermentation timing
Sourdough Brioche — Timing by Kitchen Temperature
Baseline: 2h bulk + 2h proof at 76°F. Adjust for your kitchen below.
The full Sourdough Brioche schedule (76°F baseline)
Sourdough Brioche is an enriched sourdough from France. From a ripe levain to a cooled loaf it runs about 5.9 h of dough-day time on top of a ~5-hour levain build. Every duration below is the 76°F baseline — scale it with the temperature table lower down for your own kitchen.
| Stage | Duration | Elapsed from mix |
|---|---|---|
| Levain build to peak (before mixing) | ~5 h | −5 h |
| Autolyse (flour + water rest)builds extensibility before the levain goes in | 30 min | 30 min |
| Mix — add levain & salt | 18 min | 48 min |
| Bulk fermentation (slap-and-fold enriched dough)the butter and egg slow the rise; keep the dough warm and knead to a strong window | 2 h | 2.8 h |
| Pre-shape & bench rest | 24 min | 3.2 h |
| Final shape | 12 min | 3.3 h |
| Final proof (room temperature) | 2 h | 5.3 h |
| Bake — 375°F in a loaf pan or brioche moldabout 35 minutes | 36 min | 5.9 h |
A sample same-day clock plan
One realistic way to fit Sourdough Brioche around a normal day, at ~76°F. Shift the whole thing earlier or later to suit — only the gaps between stages matter.
- 7:00 AM — feed the levain (peaks in ~5 h).
- 12:00 PM — Autolyse.
- 12:30 PM — Mix.
- 12:45 PM — Bulk fermentation.
- 2:45 PM — Pre-shape & bench rest.
- 3:09 PM — Final shape.
- 3:18 PM — Final proof.
- 5:18 PM — Bake.
- 5:53 PM — loaf out of the oven; cool at least 1 hour before slicing.
Reading each stage by feel
The clock is a guide; the dough is the real timer. Levain is ready at its peak — domed and just starting to recede, floating in water. Bulk is done at a 50–75% rise with a bubbly, jiggly, domed mass — under-shooting gives a tight crumb, over-shooting a slack, gummy one. Proof is judged by the poke test: a slow, partial spring-back. Watch a warm kitchen closely here — the 2 h room proof shortens fast above 78°F.
Temperature × time table
| Kitchen temp | Multiplier | Bulk (h) | Proof (h) |
|---|---|---|---|
| 62°F | 2.20× | 4.4 | 4.4 |
| 68°F | 1.58× | 3.2 | 3.2 |
| 72°F | 1.23× | 2.5 | 2.5 |
| 76°F | 1.00× | 2.0 | 2.0 |
| 80°F | 0.78× | 1.6 | 1.6 |
| 85°F | 0.56× | 1.1 | 1.1 |
Calculator pre-set to Sourdough Brioche
- Multiplier at 76°F
- 1×
- Adjusted bulk ferment
- 2 h
- Adjusted final proof
- 2 h
How the math works
Multipliers are piecewise-linear interpolations between reference points measured by Myhrvold et al. in Modernist Bread vol 3. 76°F is the baseline (1.0×); every 10°F drop roughly doubles fermentation time, and every 10°F rise roughly halves it.
Sourdough Brioche timing — FAQ
How long does Sourdough Brioche take start to finish?
Plan on a ~5-hour levain build first, then about 5.9 h of dough-day work at a 76°F baseline. Warmer kitchens run faster and cooler ones slower; use the temperature table below to re-time every stage.
How long is the Sourdough Brioche bulk ferment?
2 h at 76°F. It's done when the dough has risen 50–75%, domed, and jiggles when you shake the container — not strictly at the 2 h mark. Multiply by your kitchen's temperature factor (table below) to re-time it.
Can I cold-retard Sourdough Brioche overnight?
Yes — after shaping, refrigerate the loaf 10–16 hours instead of the 2 h room proof, then bake cold straight from the fridge. Cold retard deepens flavour and makes scoring cleaner, and it lets you split the bake across two days.
When is Sourdough Brioche fully proofed and ready to bake?
Use the poke test: flour a finger, press ~1 cm into the shaped loaf. Ready dough springs back slowly and only partway, leaving a slight dent. Instant spring-back = under-proofed (give it more time); no spring-back and a dense feel = over-proofed (bake immediately, next time shorten the proof).