Temperature reference

68–72°F Sourdough (20.00–22.20°C)

Bulk multiplier: 1.200× · Proof multiplier: 1.200× · Activity: moderate

Dial shows where 68–72°F sits on the sourdough activity scale (32–100°F). Indicator points at the midpoint; color shifts from cool blue (dormant) to warm orange (hyperactive).

Recommendation

Most home kitchens — typical year-round room temperature. Ferment slightly longer than 76°F baseline. Recipe times generally work as written with minor extensions (+20%). Good balance of schedule manageability and flavor development. Most Hamelman and Tartine formulas are written assuming this range.

Why 68–72°F changes your timing

Sourdough is a living culture, and its yeast and bacteria speed up as it warms. Across the useful baking window (roughly 50–95°F) the rate follows the classic Q₁₀ relationship — fermentation runs about two to three times faster for every ~15–18°F of warming. At 68–72°F the net effect is a 1.20× bulk and 1.20× proof multiplier versus the 76°F bakery baseline, so every stage runs slower. That single number is why a formula's printed times only hold at the temperature they were written for — move the dough 10 degrees and the clock is wrong.

Worked timing at 68–72°F

Fermentation stage timing at 68–72°F versus the 76°F baseline
Stage	At 76°F baseline	At this temperature
Bulk ferment (typical 4h)	4 h	4.8 h
Final proof	2.5 h	3 h
Levain to peak	5 h	6 h

Representative country-loaf baselines multiplied by this range's bulk (1.20×) and proof (1.20×) factors. Treat these as a floor to start checking, not a finish line.

What to watch for at 68–72°F

This range sits close to the 76°F bakery baseline, so printed recipe times apply almost directly — the usual bulk-and-proof cues hold with only minor adjustment. Still judge the dough by rise and feel rather than the clock; every kitchen has cold and warm spots.

How to adjust your formula at 68–72°F

Keep your usual 15–20% levain — the modest 1.20× shift is best handled by watching the dough rather than re-formulating.

To land the dough in this range even when the room swings, use the desired-dough-temperature (DDT) method: dough temperature ≈ (flour temp + room temp + water temp + friction factor) ÷ 4. Solve for the water temperature you need — in a cool kitchen use warmer water; in a hot one, cool or even iced water — so the dough itself, not just the air, sits at your target.

Telling doneness by feel, not the clock

The times above are a guide; the dough is the real timer. Bulk is done when the mass has risen 50–75%, looks domed and bubbly, and jiggles like set custard when you shake the container — an aliquot jar (a small sample in a straight-sided container) makes the rise easy to read. The final proof is ready when a floured poke springs back slowly and only partway. These cues are identical at every temperature; only when they arrive changes — at 68–72°F, sooner or later by the 1.20× factor above.

68–72°F sourdough — FAQ

How does a 68–72°F kitchen change sourdough timing?

Fermentation runs 1.20× the 76°F bakery baseline (slower). A recipe's printed 4-hour bulk becomes roughly 4.8 hours here, and a 2.5-hour proof becomes about 3 hours. Printed times only hold at the temperature they were written for.

How much longer or shorter is bulk fermentation at 68–72°F?

Multiply your recipe's baseline bulk time by 1.20. A typical 4-hour country-loaf bulk becomes about 4.8 hours at 68–72°F. The multiplier comes from Modernist Bread's temperature chapter.

What's the biggest mistake at 68–72°F?

There's no strong temperature trap here. This range sits close to the 76°F bakery baseline, so printed recipe times apply almost directly — the usual bulk-and-proof cues hold with only minor adjustment. Still judge the dough by rise and feel rather than the clock; every kitchen has cold and warm spots.

Should I change my levain percentage at 68–72°F?

Keep your usual 15–20% levain — the modest 1.20× shift is best handled by watching the dough rather than re-formulating.

How do I tell my dough is ready instead of using the clock?

Watch the dough, not the timer: a well-fermented bulk rises 50–75% and jiggles when you shake the container; a well-proofed loaf springs back slowly and only partway when poked (the "poke test"). At 68–72°F those cues arrive in a different amount of time than a recipe assumes — the cues themselves don't change.

Is 68–72°F a good kitchen temperature for sourdough?

Timing calculator at this temperature

Bulk (at 76°F)(h)

Proof (at 76°F)(h)

Your kitchen temp(°F)

Multiplier at 70°F: 1.35×
Adjusted bulk ferment: 5.4 h
Adjusted final proof: 16.2 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.

How each style behaves at this temperature

Click any style to see its full timing at 68–72°F:

Guide: temperature and time in sourdough — the piecewise-linear multipliers and how to use them in planning
Autolyse strategy by temperature — warmer kitchen needs shorter autolyse before adding starter
Levain build timing — how long to wait before peak in a hot vs cold kitchen
All 25 recipes — each has a /timing page — each recipe shows bulk + proof at 68-72°F
All 12 hydration levels — drier doughs ferment slower; combine hydration choice with temperature
All 8 temperature ranges — from cold retard 38-40°F to peak summer 88-95°F

The gear that makes the math work

A short, honest baking kit. The scale matters most — every weight on this page is in grams. The Dutch oven is what turns a good crumb into a great crust.

Digital kitchen scale (0.1 g)
Baker's percentage is by weight, not volume — a 0.1 g scale is what makes the math on this page accurate.
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Dutch oven / combo cooker
Traps steam for the first bake phase — the single biggest factor in oven spring and a blistered, glossy crust.
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Banneton proofing basket
Wicks moisture and holds shape during the final proof, so high-hydration dough doesn't spread flat.
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Bread lame + bench scraper
A sharp lame scores clean ears; a steel bench scraper handles wet, sticky dough without tearing the gluten.
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High-protein bread flour
The math assumes ~12–14% protein. Real bread flour absorbs the hydration you calculate — all-purpose won't.
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Danish dough whisk
Mixes shaggy, high-hydration dough in seconds without the gluey mess of a spoon or your hands.
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🎧 Or learn the craft by ear

The numbers here are the what; a good baking book is the why. An Audible trial gets you any title free — Michael Pollan’s Cooked(the “Air” chapter is the best story ever told about why bread rises) is a perfect first listen.

Start a free Audible trial →

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Gear guides — what actually matters