Sourdough Bulk Fermentation Time at 73 Degrees (73°F / 23°C) with 10% Starter (+61.5% Rise)
Avoiding the +84.2% conical height trap at 73°F (22.8°C) with 10% starter (8.7–10.9 hrs to +61.5% rise).
Running bulk fermentation at 73°F (22.8°C) and 10% inoculation (50g starter) yields a 8.7–10.9 hour window before dormancy below 44.8°F. Lock in oven spring at +61.5% true volumetric expansion (+46.2% vertical height rise in a sloped bowl at 5.85 cm) instead of risking a +84.2% volume explosion.
- Estimated Bulk Time
- 8.7–10.9 hrsAt 73°F (22.8°C) with 10% starter (Q10=0.86x)
- Target Aliquot Volume Rise
- +61.5%Capped volumetric cutoff (<44.8°F dormancy)
- Sloped Bowl Height Target
- 5.85 cm+46.2% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +84.2% VolCoil fold every 36m (LAB 4.9:1)
Conical Height vs. Aliquot Volume Matrix Centered on 73°F / 10% Starter
5-point neighborhood comparison around 73°F (22.8°C) and 10% starter (50g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 36-min coil fold intervals.
| Temp & Levain Seed (Around 73°F / 10%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 71°F (21.7°C) @ 8% (40g) Cooler / Lower Seed | 11.9–14.9 hrs (714–894m) | +52.6% height (4.0 → 6.1 cm) | +70.8% vol (2x trap: +98.6%) | Every 39 min (Row 1) |
| 73°F (22.8°C) @ 8% (40g) Baseline Temp / Lower Seed | 10.3–12.9 hrs (618–774m) | +46.4% height (4.0 → 5.86 cm) | +61.8% vol (2x trap: +84.7%) | Every 36 min (Row 2) |
| 73°F (22.8°C) @ 10% (50g) [Current Target] | 8.7–10.9 hrs (522–654m) | +46.2% height (4.0 → 5.85 cm) | +61.5% vol (2x trap: +84.2%) | Every 36 min (Row 3) |
| 73°F (22.8°C) @ 13% (65g) Baseline Temp / Higher Seed | 7.1–9 hrs (426–540m) | +45.9% height (4.0 → 5.84 cm) | +61.1% vol (2x trap: +83.6%) | Every 35 min (Row 4) |
| 75°F (23.9°C) @ 13% (65g) Warmer / Higher Seed | 6.2–7.6 hrs (372–456m) | +38.8% height (4.0 → 5.55 cm) | +50.9% vol (2x trap: +68.3%) | Every 32 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 73 Degrees (73°F / 23°C): Target +61.5% Rise
Homofermentative and heterofermentative LAB populations at 73°F (22.8°C) with 10% starter generate a 4.9:1 lactic-to-acetic molar ratio over 8.7–10.9 hours. As pH drops toward 4.2, spacing coil folds at 36-minute intervals preserves glutenin elasticity until the dough hits +61.5% volume (+46.2% height at 5.85 cm).
Conductive heat transfer from a 73°F (22.8°C) boule in a rattan banneton requires hours to reach the 44.8°F yeast-dormancy threshold. During that cooling tail, a 10% inoculation (LAB ratio 4.9:1, Q10=0.86x) adds residual lift—making the +61.5% cutoff (5.85 cm height, 36-min folds) mandatory.
Precision Bulk Fermentation Workflow: 73°F (22.8°C) with 50g Levain
- Starter Dispersion (50g per 500g Flour): Pinch 10% ripe starter into the autolysed mass at 73°F (22.8°C), establishing a 0.86x metabolic rate.
- Scheduled Strengthening (Every 36 Mins): Lift and tuck the dough every 36 minutes to balance the 4.9:1 lactic-to-acetic acid curve.
- Geometric Termination (+61.5% Volume): End bulk between 8.7 and 10.9 hrs once vertical height reaches 5.85 cm (+46.2%), avoiding the +84.2% 2x-height blowout.
- Cold-Shelf Transfer (44.8°F Cutoff): Seal the shaped loaf in a floured liner and place on the bottom 37°F–38°F fridge shelf to arrest yeast below 44.8°F.
Frequently Asked Questions for This Bulk Fermentation Temp × Inoculation Spec
How does 10% starter affect sourness and lactic-to-acetic ratio at 73°F?
Fermenting with 10% levain at 73°F (22.8°C) produces an estimated 4.9:1 lactic-to-acetic organic acid ratio across 8.7–10.9 hours before shaping at +61.5% rise.
Should I use an aliquot jar or bowl ruler for 73°F bulk fermentation at 10% levain?
Either works when calibrated: look for +61.5% true volumetric expansion in a straight-walled aliquot jar, or +46.2% vertical height rise in a sloped bowl (4.0 cm to 5.85 cm) over 8.7–10.9 hrs.
What percentage rise should I look for at 73°F (22.8°C) with 10% levain?
Target +61.5% true volumetric expansion (+46.2% vertical height rise in a sloped bowl, from 4.0 cm to 5.85 cm) before 38°F cold retarding, avoiding the +84.2% volume explosion of doubling height.