Sourdough Bulk Fermentation Time at 74 Degrees (74°F / 23°C) with 15% Starter (+55.7% Rise)
Thermal carryover modeling into a 38°F retarder from 74°F (23.3°C) at 15% levain: target +42.2% vertical climb (5.69 cm).
Fermenting a 74°F (23.3°C) dough inoculated at 15% (75g active culture/500g flour) requires 6 to 7.4 hours with 33-minute coil folds. Shape at +55.7% true volumetric expansion (+42.2% vertical height rise in a sloped bowl from 4.0 cm to 5.69 cm) to avoid the +75.5% volume explosion of a 2x height trap.
- Estimated Bulk Time
- 6–7.4 hrsAt 74°F (23.3°C) with 15% starter (Q10=0.93x)
- Target Aliquot Volume Rise
- +55.7%Capped volumetric cutoff (<44.7°F dormancy)
- Sloped Bowl Height Target
- 5.69 cm+42.2% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +75.5% VolCoil fold every 33m (LAB 5.3:1)
Arrhenius Kinetics & Coil-Fold Schedule Matrix Around 74°F (15% Inoculation)
5-point neighborhood comparison around 74°F (23.3°C) and 15% starter (75g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 33-min coil fold intervals.
| Temp & Levain Seed (Around 74°F / 15%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 72°F (22.2°C) @ 13% (65g) Cooler / Lower Seed | 7.6–9.7 hrs (456–582m) | +49.4% height (4.0 → 5.98 cm) | +66.1% vol (2x trap: +91.3%) | Every 36 min (Row 1) |
| 74°F (23.3°C) @ 13% (65g) Baseline Temp / Lower Seed | 6.7–8.3 hrs (402–498m) | +42.4% height (4.0 → 5.7 cm) | +56% vol (2x trap: +75.9%) | Every 33 min (Row 2) |
| 74°F (23.3°C) @ 15% (75g) [Current Target] | 6–7.4 hrs (360–444m) | +42.2% height (4.0 → 5.69 cm) | +55.7% vol (2x trap: +75.5%) | Every 33 min (Row 3) |
| 74°F (23.3°C) @ 18% (90g) Baseline Temp / Higher Seed | 5.2–6.5 hrs (312–390m) | +41.9% height (4.0 → 5.68 cm) | +55.3% vol (2x trap: +74.9%) | Every 32 min (Row 4) |
| 76°F (24.4°C) @ 18% (90g) Warmer / Higher Seed | 4.5–5.6 hrs (270–336m) | +35.9% height (4.0 → 5.44 cm) | +46.9% vol (2x trap: +62.5%) | Every 29 min (Row 5) |
Interactive Bulk Fermentation Temp × Inoculation Calculator
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When to Stop Bulk Fermentation at 74 Degrees (74°F / 23°C): Target +55.7% Rise
At 74°F (23.3°C), a 15% levain inoculation drives CO2 saturation across a 6–7.4 hr kinetic window (Q10=0.93x). Because a 24 cm sloped bowl widens quadratically with elevation z, a +55.7% volumetric target equals 5.69 cm (+42.2% height), whereas 8.0 cm height triggers a +75.5% collapse.
Biot-number thermal gradients inside an 850g–950g batard mean the outer crust chills to 44.7°F long before the 74°F (23.3°C) center. For a 15% levain formula (Q10=0.93x, 33-min fold spacing), terminating bulk at 6–7.4 hrs and 5.69 cm (+42.2% height / +55.7% volume) prevents center-crumb blowout.
Precision Bulk Fermentation Workflow: 74°F (23.3°C) with 75g Levain
- Formula Seeding (75g Starter / 74°F): Fold 15% active starter into your 500g main flour dough at 74°F (23.3°C) (Q10 factor 0.93x).
- Interval Folding (33 Mins Apart): Apply wet-hand coil folds every 33 minutes to reinforce disulfide cross-links during the 6–7.4 hr bulk.
- Conical Frustum Inspection (5.69 cm): Verify a +42.2% vertical rise (4.0 → 5.69 cm, equal to +55.7% volume) rather than risking a +75.5% 2x height explosion.
- Cold Proofing Arrest (<44.7°F): Pre-shape, rest 20 min, final-shape, and load into a 38°F fridge so fermentation tapers off below 44.7°F.
Frequently Asked Questions for This Bulk Fermentation Temp × Inoculation Spec
How do I adjust 74°F bulk time if I drop starter from 15% to 13%?
Reducing inoculation from 15% to 13% at 74°F (23.3°C) extends the 6–7.4 hr bulk window while keeping the same +55.7% volumetric (5.69 cm height) shaping target.
At what internal temperature does a 74°F dough stop rising in the fridge?
When transferred from 74°F (23.3°C) to a 38°F refrigerator at +55.7% volume (5.69 cm bowl height), wild yeast budding tapers into dormancy once the core cools below 44.7°F.
How often should I do coil folds at 74°F with 15% starter?
Space your coil folds every 33 minutes during the first half of the 6–7.4 hour window at 74°F (23.3°C) so the gluten network holds its +55.7% rise.