Overnight Counter Sourdough Bulk Fermentation at 64 Degrees (64°F / 18°C) with 12% Starter
LAB 3.1:1 organic acid balance and 14.2–19 hr bulk schedule for 64°F (17.8°C) doughs inoculated at 12%.
Baking at 64°F (17.8°C) with 12% inoculation (60g starter/500g flour) sets a 14.2–19 hour bulk clock before core cooling past 43.4°F. Aim for +75% true volumetric expansion (+71.7% vertical height rise in a sloped bowl to 6.87 cm) and avoid the +146.9% volume explosion of doubling height.
- Estimated Bulk Time
- 14.2–19 hrsAt 64°F (17.8°C) with 12% starter (Q10=0.44x)
- Target Aliquot Volume Rise
- +75%Capped volumetric cutoff (<43.4°F dormancy)
- Sloped Bowl Height Target
- 6.87 cm+71.7% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +146.9% VolCoil fold every 45m (LAB 3.1:1)
Conical Height vs. Aliquot Volume Matrix Centered on 64°F / 12% Starter
5-point neighborhood comparison around 64°F (17.8°C) and 12% starter (60g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 45-min coil fold intervals.
| Temp & Levain Seed (Around 64°F / 12%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 62°F (16.7°C) @ 10% (50g) Cooler / Lower Seed | 18.9–25.2 hrs (1134–1512m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 48 min (Row 1) |
| 64°F (17.8°C) @ 10% (50g) Baseline Temp / Lower Seed | 16.3–21.8 hrs (978–1308m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 46 min (Row 2) |
| 64°F (17.8°C) @ 12% (60g) [Current Target] | 14.2–19 hrs (852–1140m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 45 min (Row 3) |
| 64°F (17.8°C) @ 15% (75g) Baseline Temp / Higher Seed | 12.1–16 hrs (726–960m) | +71.7% height (4.0 → 6.87 cm) | +75% vol (2x trap: +146.9%) | Every 44 min (Row 4) |
| 66°F (18.9°C) @ 15% (75g) Warmer / Higher Seed | 10.5–13.6 hrs (630–816m) | +68.2% height (4.0 → 6.73 cm) | +75% vol (2x trap: +137.5%) | Every 42 min (Row 5) |
Dynamic Stoichiometric Workbench (14.2–19 hrs)
Test custom loaf weights or alternative fermentation schedules directly against the +75% benchmark above.
Overnight Cold-Counter Kinetics at 64 Degrees (64°F / 18°C): Target +75% Rise
At 64°F (17.8°C), a 12% levain inoculation drives CO2 saturation across a 14.2–19 hr kinetic window (Q10=0.44x). Because a 24 cm sloped bowl widens quadratically with elevation z, a +75% volumetric target equals 6.87 cm (+71.7% height), whereas 8.0 cm height triggers a +146.9% collapse.
Enzymatic alpha-amylase dextrinization and acid proteolysis (3.1:1 lactic-to-acetic ratio) persist during initial 38°F cooling until internal temperature drops through 43.4°F. Starting cold retard from 64°F (17.8°C) at +75% volume (6.87 cm conical height after 14.2–19 hrs at 12% seed) safeguards gluten film thickness.
Step-by-Step 64°F / 12% Starter Execution & 6.87 cm Cutoff
- Quantitative Weigh-In (12% Seed): Measure 60g bubbly 100% starter into your 500g flour batch and confirm a 64°F (17.8°C) post-mix temperature.
- Timed Coil-Fold Window (45 Mins): Space 3 to 4 coil folds at 45-minute intervals while Q10=0.44x kinetics build alveolar tension.
- Sloped-Bowl Readout (6.87 cm Target): Watch for domed shoulders at 14.2–19 hrs when bowl depth climbs +71.7% to 6.87 cm (+75% true volume).
- Overnight Retardation (<43.4°F): Shape with minimal flour and cold-proof 12–16 hours at 38°F as core temperature crosses the 43.4°F dormancy line.
Key Baker's Math Questions (Estimated Bulk Time: 14.2–19 hrs)
At what internal temperature does a 64°F dough stop rising in the fridge?
When transferred from 64°F (17.8°C) to a 38°F refrigerator at +75% volume (6.87 cm bowl height), wild yeast budding tapers into dormancy once the core cools below 43.4°F.
When should I stop stretching and folding a 64°F dough with 12% starter?
Complete your 45-minute coil fold sets within the first 8.5 hours at 64°F (17.8°C), leaving the final stretch undisturbed until the dough reaches 6.87 cm (+75% volume).
What happens if my 64°F kitchen warms up by 2°F during a 12% starter bulk?
A +2°F rise to 66°F accelerates Q10 kinetics above 0.44x and shortens the 14.2–19 hr window, so monitor the 6.87 cm (+75% volume) mark closely.