Sourdough Bulk Fermentation Time at 74 Degrees (74°F / 23°C) with 20% Starter (+55% Rise)
LAB 5.5:1 organic acid balance and 4.8–6 hr bulk schedule for 74°F (23.3°C) doughs inoculated at 20%.
For a 74°F (23.3°C) batch seeded at 20% starter (100g per 500g flour), schedule 4.8–6 hours on the bench and fold every 31 minutes. Bench-shape strictly at +55% true volumetric expansion (+41.7% vertical height rise in a sloped bowl to 5.67 cm) so you never suffer the +74.4% volume explosion of doubling bowl height.
- Estimated Bulk Time
- 4.8–6 hrsAt 74°F (23.3°C) with 20% starter (Q10=0.93x)
- Target Aliquot Volume Rise
- +55%Capped volumetric cutoff (<44.6°F dormancy)
- Sloped Bowl Height Target
- 5.67 cm+41.7% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +74.4% VolCoil fold every 31m (LAB 5.5:1)
Arrhenius Kinetics & Coil-Fold Schedule Matrix Around 74°F (20% Inoculation)
5-point neighborhood comparison around 74°F (23.3°C) and 20% starter (100g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 31-min coil fold intervals.
| Temp & Levain Seed (Around 74°F / 20%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 72°F (22.2°C) @ 18% (90g) Cooler / Lower Seed | 6–7.6 hrs (360–456m) | +48.8% height (4.0 → 5.95 cm) | +65.3% vol (2x trap: +90.1%) | Every 34 min (Row 1) |
| 74°F (23.3°C) @ 18% (90g) Baseline Temp / Lower 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 2) |
| 74°F (23.3°C) @ 20% (100g) [Current Target] | 4.8–6 hrs (288–360m) | +41.7% height (4.0 → 5.67 cm) | +55% vol (2x trap: +74.4%) | Every 31 min (Row 3) |
| 74°F (23.3°C) @ 23% (115g) Baseline Temp / Higher Seed | 4.4–5.4 hrs (264–324m) | +41.4% height (4.0 → 5.66 cm) | +54.6% vol (2x trap: +73.8%) | Every 30 min (Row 4) |
| 76°F (24.4°C) @ 23% (115g) Warmer / Higher Seed | 3.8–4.7 hrs (228–282m) | +35.5% height (4.0 → 5.42 cm) | +46.3% vol (2x trap: +61.6%) | Every 28 min (Row 5) |
Interactive Bulk Fermentation Temp × Inoculation Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
When to Stop Bulk Fermentation at 74 Degrees (74°F / 23°C): Target +55% Rise
Alveograph tenacity-to-extensibility (P/L) ratios shift rapidly at 74°F (23.3°C) when seeded with 20% levain (100g/500g). Across 4.8–6 hours (Q10=0.93x), each 31-minute coil fold restores elastic recovery until the +41.7% sloped-bowl mark (5.67 cm, +55% volume) signals immediate shaping.
Biot-number thermal gradients inside an 850g–950g batard mean the outer crust chills to 44.6°F long before the 74°F (23.3°C) center. For a 20% levain formula (Q10=0.93x, 31-min fold spacing), terminating bulk at 4.8–6 hrs and 5.67 cm (+41.7% height / +55% volume) prevents center-crumb blowout.
Managing a 74°F (23.3°C) / 20% Inoculation Sourdough Schedule
- Seed & Thermal Check (74°F / 23.3°C): Verify dough core reads 74°F after incorporating 100g active levain (20% baker's math) for a 5.5:1 LAB balance.
- Aliquot & Sloped Vessel Setup: Place 40g dough in a straight cylinder (mark +55%) and set a ruler at 5.67 cm (+41.7% climb) on your 24 cm sloped bowl.
- Gluten Alignment (31-Min Intervals): Perform gentle folds every 31 minutes without degassing; stop folding 90 minutes before hour 4.8.
- Bench Preshape & 38°F Retard: Dump onto the bench between 4.8 and 6 hours at +55% rise, tension-roll, and refrigerate immediately until core drops past 44.6°F.
Frequently Asked Questions for This Bulk Fermentation Temp × Inoculation Spec
How often should I do coil folds at 74°F with 20% starter?
Space your coil folds every 31 minutes during the first half of the 4.8–6 hour window at 74°F (23.3°C) so the gluten network holds its +55% rise.
Why is the recommended rise capped at +55% for 74°F and 20% starter?
Capping bench expansion at +55% true volumetric expansion (+41.7% vertical height rise in a sloped bowl) preserves glutenin elasticity against protease clipping (Q10=0.93x) and avoids a +74.4% volume explosion.
When should I stop stretching and folding a 74°F dough with 20% starter?
Complete your 31-minute coil fold sets within the first 2.9 hours at 74°F (23.3°C), leaving the final stretch undisturbed until the dough reaches 5.67 cm (+55% volume).