Sourdough Proofing Timer: How Long to Proof Dough at Every Stage

Why Sourdough Timing Is Different

Commercial yeast bread uses a standardized product with predictable activity. Sourdough uses a live, wild yeast starter that varies in strength, hydration, and bacterial composition. This means sourdough timing is always a range — and learning to read dough rather than relying exclusively on the timer is essential. The timer keeps you in the ballpark; the dough tells you when it is ready.

Stage 1: Levain Build (3–12 Hours)

Before making the final dough, you feed your starter (levain) and let it peak. This takes 4–8 hours at room temperature (70–75°F) or up to 12 hours in cooler conditions. Your levain is ready when it has doubled in volume, has a domed top (not fallen), and passes the float test: a teaspoon dropped in water floats rather than sinks.

Stage 2: Autolyse (30–60 Minutes)

Autolyse means combining flour and water and letting it rest before adding starter and salt. This resting period (typically 30–60 minutes) allows the flour to fully hydrate and gluten to begin developing without mixing effort. It dramatically improves dough extensibility.

Stage 3: Bulk Fermentation (4–12 Hours)

After mixing the final dough (flour + water + levain + salt), the bulk fermentation begins. At 75°F (24°C), expect 4–6 hours. At 70°F (21°C), expect 6–8 hours. At 65°F (18°C), expect 8–12 hours. The dough should increase by 50–75% and show active bubbles on the surface and sides.

Stretch and Fold During Bulk

During bulk fermentation, perform stretch-and-fold sets every 30–45 minutes for the first 2–3 hours (4–6 sets total). Each set takes about 1 minute. This builds gluten strength without deflating fermentation gases.

Stage 4: Shaping and Cold Proof (8–18 Hours)

After bulk fermentation and shaping, most sourdough bakers do a cold proof (retard) in the refrigerator. This typically runs 8–18 hours at 38–40°F (3–4°C). Longer cold proofs develop more sour flavor. The cold proof can be extended to 24 hours for most recipes without over-fermentation.

Stage 5: Baking (40–50 Minutes)

Preheat Dutch oven at 500°F (260°C) for 45–60 minutes. Bake covered for 20 minutes (steam creates oven spring), then uncover and bake for 20–25 more minutes until deep brown. Internal temperature should reach 205–210°F (96–99°C).