How to Make Sourdough Bread: From Starter to Perfect Loaf

Sourdough is the original bread — leavened not by commercial yeast but by wild yeast and bacteria you cultivate yourself. The starter you maintain becomes more flavorful and reliable over months and years. The bread it produces has a chewy crust, open crumb, and deep tangy flavor that no store-bought loaf can match. The process spans two days, but the active work is less than 30 minutes.

Phase 1: Your Sourdough Starter #

You can’t make sourdough without a starter — a live culture of wild yeast and lactobacillus bacteria. You can get one from a friend, buy one online, or make your own (takes about 7 days).

To make a starter from scratch:

• Day 1: Mix 50g whole wheat flour + 50g lukewarm water in a jar. Stir vigorously, cover loosely, leave at room temperature.
• Day 2–7: Each day, discard half the starter and feed with 50g all-purpose flour + 50g water.
• Ready when: It reliably doubles in size 4–8 hours after feeding, has a pleasant tangy smell, and shows active bubbles throughout.

Feeding your active starter: Once established, feed once a day at room temperature or once a week in the refrigerator. Before baking, take it out of the fridge, feed it, and let it become active (doubled, bubbly) before using — usually 4–8 hours.

The Basic Sourdough Formula (1 loaf) #

• 450g bread flour (or 400g bread flour + 50g whole wheat)
• 325g water (72% hydration — a good starting point)
• 90g active starter (fed 4–8 hours before baking)
• 9g fine sea salt

Total dough weight: ~875g

Use a kitchen scale — baking by weight is far more consistent than by volume.

Phase 2: Mix the Dough (Day 1) #

Autolyse (optional but recommended): Combine the flour and 300g of the water in a large bowl. Mix until no dry flour remains. Cover and rest 30–60 minutes. This pre-hydrates the flour, making the dough easier to develop.

Add the starter to the autolysed dough. Mix thoroughly by hand — squeeze the dough through your fingers to incorporate. Add the salt plus the remaining 25g water. Mix again until fully combined. The dough will feel shaggy and a bit sticky.

Phase 3: Bulk Fermentation (4–6 hours) #

This is the primary rise where flavor develops. Keep the dough at room temperature (68–75°F is ideal).

Stretch and fold: During the first 2 hours, perform 4 sets of stretch and folds, 30 minutes apart. For each set: grab one side of the dough, stretch it up, fold it over to the other side. Rotate the bowl 90° and repeat 3 more times (4 folds per set). Cover between sets.

How do you know bulk fermentation is done? The dough should increase in size by 50–75%, feel lighter and airy, and show bubbles on the surface and sides. In a warm kitchen, this takes 4 hours; in a cool kitchen, 6–8 hours.

Phase 4: Pre-shape and Shape #

Turn the dough onto an unfloured surface. Using a bench scraper, fold the dough over itself to build tension, then drag it toward you to tighten the surface. Let it rest uncovered for 20–30 minutes (bench rest).

Final shaping:

• For a round loaf (boule): Flip the dough, stretch out the sides, fold them in, then roll the dough toward you while pressing down with your thumbs to create a taut ball.
• For an oval loaf (batard): Flatten slightly, fold the sides in, then roll forward into a football shape.

Place the shaped loaf seam-side up in a floured banneton (proofing basket) or a bowl lined with a well-floured towel. Dust with rice flour to prevent sticking.

Phase 5: Cold Retard (Overnight) #

Cover and refrigerate the shaped loaf for 12–18 hours. This cold fermentation develops complex flavor and makes scoring easier. You can bake directly from the fridge — no need to warm up.

Phase 6: Bake (Day 2) #

Preheat your Dutch oven at 500°F (260°C) for at least 45 minutes. The Dutch oven is critical — it traps steam around the bread during the early bake, allowing full oven spring before the crust sets.

Turn the cold dough onto parchment paper. Score the top with a razor lame or sharp knife — make one confident stroke at a 30-degree angle, about 4 inches long. This controls where the bread opens during oven spring.

Carefully lower the dough (parchment and all) into the screaming-hot Dutch oven. Cover and bake 20 minutes. Remove the lid and bake another 20–25 minutes until deep golden brown. Internal temperature should reach 205–210°F.

Cool on a wire rack for at least 1 hour before cutting — the crumb is still setting during this time.

Troubleshooting #

• Dough won’t hold shape: Starter is underactive or dough is under-fermented. Give more time.
• Dense crumb: Under-fermented (not enough time) or over-fermented (dough collapsed). Check the bulk fermentation stage.
• Flat loaf: Starter not active enough, or over-proofed (left in fridge too long).
• Pale crust: Dutch oven not hot enough, or lid left on too long. Bake uncovered longer.

Sourdough has a learning curve, but even imperfect loaves taste excellent. The second bake is always better than the first.