Temperature × recipe

Spelt Hearth Loaf at 8387°F

Adjusted timing: 1.7h bulk + 3.4h proof (multiplier 0.56×).

Baseline bulk (76°F)
3h
Adjusted bulk
1.7h
Baseline proof
6h
Adjusted proof
3.4h
Multiplier
0.56×
Activity
hyperactive
Target hydration
70%
Bake temp
450°F

Why the timing shifts

Hot kitchen — summer without AC, near-window light. Ferment nearly 2× faster than baseline. Not ideal — fermentation outpaces gluten development, leading to over-acidic flavor and collapsed structure. If unavoidable, use very low levain (10-12%), minimal bulk (2h max), and get dough into cold retard ASAP. Consider reducing bulk temperature by moving dough to cooler location (basement, refrigerator brief intervals).

Technique for Spelt Hearth Loaf

Short autolyse (20 min). 2-3 GENTLE stretch-and-folds (spelt gluten tears easily). 3h bulk. Shape carefully, floured banneton, 6h cold retard. Bake in dutch oven 450°F: 20 min lid on, 18 min off.

Calculator pre-set to these values

Multiplier at 85°F
0.56×
Adjusted bulk ferment
1.7 h
Adjusted final proof
3.4 h
How the math works

Multipliers are piecewise-linear interpolations between reference points measured by Myhrvold et al. in Modernist Bread vol 3. 76°F is the baseline (1.0×); every 10°F drop roughly doubles fermentation time, and every 10°F rise roughly halves it.

Sources: Myhrvold, Modernist Bread vol 3 (temperature multipliers); Peter Reinhart — Whole Grain Breads, Spelt chapter.