Preventing Overproofed Sourdough at 78 Degrees (78°F Summer Kitchen) with 25% Starter
Q10=1.25x metabolic curve for 125g starter per 500g flour at 78°F (25.6°C): stop at 5.22 cm bowl height (+39.5% aliquot rise).
Fermenting a 78°F (25.6°C) dough inoculated at 25% (125g active culture/500g flour) requires 3 to 3.8 hours with 25-minute coil folds. Shape at +39.5% true volumetric expansion (+30.6% vertical height rise in a sloped bowl from 4.0 cm to 5.22 cm) to avoid the +51.9% volume explosion of a 2x height trap.
- Estimated Bulk Time
- 3–3.8 hrsAt 78°F (25.6°C) with 25% starter (Q10=1.25x)
- Target Aliquot Volume Rise
- +39.5%Capped volumetric cutoff (<45°F dormancy)
- Sloped Bowl Height Target
- 5.22 cm+30.6% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +51.9% VolCoil fold every 25m (LAB 6.5:1)
Arrhenius Kinetics & Coil-Fold Schedule Matrix Around 78°F (25% Inoculation)
5-point neighborhood comparison around 78°F (25.6°C) and 25% starter (125g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 25-min coil fold intervals.
| Temp & Levain Seed (Around 78°F / 25%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 76°F (24.4°C) @ 23% (115g) Cooler / Lower 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 1) |
| 78°F (25.6°C) @ 23% (115g) Baseline Temp / Lower Seed | 3.2–4.1 hrs (192–246m) | +30.7% height (4.0 → 5.23 cm) | +39.7% vol (2x trap: +52.2%) | Every 25 min (Row 2) |
| 78°F (25.6°C) @ 25% (125g) [Current Target] | 3–3.8 hrs (180–228m) | +30.6% height (4.0 → 5.22 cm) | +39.5% vol (2x trap: +51.9%) | Every 25 min (Row 3) |
| 78°F (25.6°C) @ 28% (140g) Baseline Temp / Higher Seed | 2.7–3.5 hrs (162–210m) | +30.3% height (4.0 → 5.21 cm) | +39.2% vol (2x trap: +51.5%) | Every 24 min (Row 4) |
| 80°F (26.7°C) @ 28% (140g) Warmer / Higher Seed | 2.3–3.1 hrs (138–186m) | +23.1% height (4.0 → 4.92 cm) | +29.4% vol (2x trap: +37.9%) | Every 21 min (Row 5) |
Real-Time Dough & Starter Scaling Sandbox
Scale this Warm Weather 78 Degrees (78°F / 26°C specification up or down on your digital scale with zero hydration drift.
Thermal Momentum Warning at 78°F (26°C): Cut Off 25% Starter Bulk at +39.5% Rise
Alveograph tenacity-to-extensibility (P/L) ratios shift rapidly at 78°F (25.6°C) when seeded with 25% levain (125g/500g). Across 3–3.8 hours (Q10=1.25x), each 25-minute coil fold restores elastic recovery until the +30.6% sloped-bowl mark (5.22 cm, +39.5% volume) signals immediate shaping.
Conductive heat transfer from a 78°F (25.6°C) boule in a rattan banneton requires hours to reach the 45°F yeast-dormancy threshold. During that cooling tail, a 25% inoculation (LAB ratio 6.5:1, Q10=1.25x) adds residual lift—making the +39.5% cutoff (5.22 cm height, 25-min folds) mandatory.
Precision Bulk Fermentation Workflow: 78°F (25.6°C) with 125g Levain
- Seed & Thermal Check (78°F / 25.6°C): Verify dough core reads 78°F after incorporating 125g active levain (25% baker's math) for a 6.5:1 LAB balance.
- Aliquot & Sloped Vessel Setup: Place 40g dough in a straight cylinder (mark +39.5%) and set a ruler at 5.22 cm (+30.6% climb) on your 24 cm sloped bowl.
- Gluten Alignment (25-Min Intervals): Perform gentle folds every 25 minutes without degassing; stop folding 90 minutes before hour 3.
- Bench Preshape & 38°F Retard: Dump onto the bench between 3 and 3.8 hours at +39.5% rise, tension-roll, and refrigerate immediately until core drops past 45°F.
Diagnostic Answers: Warm Weather 78 Degrees (78°F / 26°C) Sourdo
How many grams of starter is 25% inoculation for a 500g flour loaf at 78°F?
A 25% inoculation on 500g main flour equals 125g of active 100% hydration starter (63g flour + 63g water), fermenting in 3–3.8 hours at 78°F.
How high should dough climb in a 9-inch sloped bowl at 78°F and 25% starter?
Starting at 4.0 cm depth in a 24 cm top / 14 cm bottom bowl, stop bulk at 5.22 cm (+30.6% vertical height rise in a sloped bowl), which equals +39.5% true volumetric expansion.
At what internal temperature does a 78°F dough stop rising in the fridge?
When transferred from 78°F (25.6°C) to a 38°F refrigerator at +39.5% volume (5.22 cm bowl height), wild yeast budding tapers into dormancy once the core cools below 45°F.