A reusable guide for the bulk rise using your oven — the proof setting if you have one, or the oven light if you don't. Works with any recipe on this site that calls for a bulk rise — Classic, Italian, Country Wheat, Honey Oat, all of them.
Two methods, one goal
Both methods do the same job: give your dough a warm, still, draft-free environment during the bulk rise. The difference is temperature and speed.
| Method | Temperature | Typical bulk time | Best for |
|---|---|---|---|
| Proof setting | ~100°F | ~45 min | Ovens that have the setting; faster rise |
| Oven light only | ~75–85°F | ~60–90 min | Ovens with no proof setting; older or budget models |
Either method beats a cold kitchen counter. Pick the one your oven supports.
Method 1: The proof setting
What it actually does
It holds the oven at about 100°F — warmer than the kitchen, warm enough to speed up yeast without cooking the dough. It's a controlled, gentle warm box.
When to use it (and when not to)
| Step | Use proof setting? | Why |
|---|---|---|
| Bulk rise (before shaping) | YES | The proof setting was designed for this. Cuts the rise from ~1 hour to ~45 min. |
| Cold retard (overnight) | NO | The slow cold develops flavor. Heat ruins it. Always the fridge. |
| Feeding the starter | NO | Sourdough Home at 73°F already does this. Don't stack heat. |
| Final proof | NO | The cold retard IS the final proof. No second rise. |
So really: proof setting = bulk rise, and only the bulk rise.
The bulk rise, step by step
This replaces step 11 in the Classic recipe (and the equivalent step in every other recipe — usually called "Bulk rise" or "Bulk ferment").
- After your last fold, leave the dough in the covered bowl
- Turn the oven to proof (~100°F)
- Place the covered bowl in the oven
- Set a 45-minute timer
What you're looking for
Open the oven at 45 min and check for these three things:
- [ ] 50% growth — the dough is half again as big as when you put it in (not doubled)
- [ ] Domed top — it's pushed up, slightly rounded
- [ ] Puffy and bubbly — small bubbles visible on top or sides
If all three are there, pull it out and shape immediately. If not all three, give it 5–10 more minutes and check again.
Critical rule: never go past doubled
Doubled = over-proofed. The dough is exhausted before it gets in the oven and won't spring properly. You'll get a flat, dense loaf.
If you see doubled, shape and bake right away — you might still save it. But next time, set a shorter timer.
Recipe-specific timing
Different recipes ferment at different speeds. These are starting points — your kitchen and your starter will vary.
| Recipe | Standard bulk rise | With proof setting | Notes |
|---|---|---|---|
| Classic | 1 hour | ~45 min | The baseline |
| Italian | 1 hour | ~45 min | Olive oil makes it look glossy — don't worry |
| Country Wheat | 45–60 min | ~35–40 min | Wheat ferments faster, watch closely |
| Honey Oat | 75–90 min | ~50–60 min | Enriched dough is slower |
| Hemp Hearts | 4–6 hours | Not recommended | Too long for proof setting; use counter |
Adjustments by season
The proof setting is consistent year-round, which is its whole point. But the dough entering it isn't.
- Winter: Dough comes from a cool kitchen. May need an extra 5–10 min.
- Summer: Dough comes from a warm kitchen. May be ready in 35–40 min.
Always watch the dough, not the clock. The dough is the truth. The timer is a guess.
When the proof setting fails you
| Problem | Likely cause | Fix |
|---|---|---|
| Dough hardly rose in 45 min | Starter wasn't at peak when you mixed | Feed the starter earlier next time; only mix when it floats |
| Dough doubled before 30 min | Proof setting runs hotter than 100°F | Test oven with a thermometer; reduce timer |
| Dough rose then collapsed | Over-proofed, gluten broke | Shorter timer next time; shape sooner |
| Dough smells boozy/sharp | Over-fermented | Same — shorter timer, watch closely |
The honest version
The proof setting is a tool, not magic. It speeds up the bulk rise so you don't have to plan a full day around a slow kitchen. It does not replace:
- Watching the dough
- Knowing what 50% growth looks like
- Trusting your starter when it's ready
If you only learn one thing from this guide: the timer is a suggestion, the dough is the truth.
Quick reference card
For any Lean Master or Italian dough:
- Mix → autolyse → salt → 4 folds (30 min apart)
- Turn oven to proof
- Covered bowl into oven
- Timer: 45 min
- Check at 45 — 50% growth, domed, bubbly
- Shape immediately when ready
- Banneton → fridge for cold retard (10–14 hr)
- Bake from cold the next day
That's it. Print this. Stick it inside a cabinet door.
Method 2: The oven-light-only method
What it does
A standard incandescent oven bulb puts out enough gentle heat to raise the interior of a closed oven to around 75–85°F — perfect for sourdough. Free. No settings, no timers on the oven itself. Just a light bulb.
How to set it up
- Confirm the oven is OFF at the wall panel. This is the single most important step. See the safety note below.
- Turn on the oven light
- Place your covered bowl on the middle rack
- Close the oven door
- Set a 60-minute timer on your phone (not the oven)
Timing
About 15–30 minutes slower than the proof setting because the temperature is lower. That's a good thing — a slower rise develops more flavor.
| Recipe | With proof setting | With oven light only |
|---|---|---|
| Classic | ~45 min | ~60–75 min |
| Italian | ~45 min | ~60–75 min |
| Country Wheat | ~35–40 min | ~50–60 min |
| Honey Oat | ~50–60 min | ~75–90 min |
| Hemp Hearts | Not recommended | Not recommended (needs long counter rise) |
Same three cues to look for: 50% growth, domed top, puffy and bubbly. Watch the dough, not the clock.
Safety — read this before you use this method
Never turn the oven on while a bowl of dough is inside. Sounds obvious. Happens more often than you'd think. Two habits that prevent it:
- Use a physical reminder. Hang a wooden spoon on the oven handle or drape a dish towel across the front. Signals "there's something inside" to future-you.
- If someone else uses your kitchen, tell them what's in the oven. Roommates, partners, family — a preheating oven turns a $2 bulk rise into a $200 emergency.
Also worth knowing:
- Some ovens auto-shut-off the light after 15 minutes. If yours does, the interior temperature will slowly drop toward room temp. Not a disaster — it just means a slower rise, closer to counter timing. Check at the 45-min mark to see how the dough looks. If it's cool inside, the light shut off.
- LED ovens don't work for this method. LED bulbs put out almost no heat. If your oven has an LED bulb, you're better off using the proof setting (if available), a warm spot on the counter, or a proofing box like Brod & Taylor Sourdough Home. Test yours: turn the light on for 30 minutes with the door closed, then check the interior with an instant-read thermometer. If it's below 72°F, this method won't do enough for you.
When to use oven-light over proof setting
- Your oven doesn't have a proof setting
- Your proof setting runs too hot (some run 105–110°F and over-proof fast)
- You want a longer, more flavorful bulk without babysitting the counter
- You're baking overnight and want a gentle warm spot that won't over-fire
Even cheaper: no oven at all
A warm spot on the counter also works — near the fridge (compressor puts out gentle heat), on top of the router, next to a running dishwasher, or in a sunlit window in summer. Any of these can hit 72–80°F. Slower than either oven method, but free and requires zero setup.
The Hemp Hearts actually prefers this — it's meant for a 4–6 hour cool rise on the counter, not an accelerated warm environment.