Learn How to Make Homemade Sourdough Bread

Understanding Sourdough Starter and Its Role

A sourdough starter is a living culture of wild yeast and bacteria that ferments flour and water. Unlike commercial yeast, which is a single strain added to dough, sourdough starters contain multiple microorganisms that develop naturally over time. The main organisms are Saccharomyces cerevisiae (a wild yeast) and Lactobacillus (bacteria that produce lactic acid). These microbes work together to leaven bread and create the distinctive tangy flavor associated with sourdough.

Creating a starter requires only two ingredients: flour and water. Most home bakers report that starters become active and ready for baking within 5 to 10 days, though some take up to two weeks depending on room temperature and flour type. The warmer your kitchen, the faster fermentation occurs. A starter kept at 70-75°F typically develops faster than one in a 65°F environment.

The starter needs regular feeding to maintain the balance of microorganisms. Feeding involves discarding a portion of the existing starter and adding fresh flour and water. This process removes spent nutrients and provides new food for the cultures. A starter fed once daily at room temperature is considered "active," while one fed once weekly in the refrigerator is considered "dormant" but still viable for baking.

• Day 1-2: Mix equal parts flour and water (typically 50g each); stir and cover loosely
• Day 3-4: Discard half the mixture; feed with fresh flour and water
• Day 5-7: Repeat daily feedings; look for bubbles and a pleasant sour smell
• Day 8-10: Starter shows consistent rise and fall after feeding; ready for baking

Practical Takeaway: Keep your starter at room temperature during the development phase. Feed it at the same time each day to establish a predictable schedule. Once it doubles in size within 4-8 hours of feeding, it contains enough active yeast and bacteria to leaven bread successfully.

Preparing Your Ingredients and Kitchen Equipment

Sourdough bread requires only four basic ingredients: flour, water, salt, and your active starter. However, understanding how each ingredient affects the final product helps produce better results. All-purpose flour works well for beginning bakers, though bread flour (which contains more protein) creates chewier texture with better structure. Whole wheat flour can replace up to 30% of the all-purpose flour, adding nutty flavor and denser crumb structure.

Water quality matters more than many bakers realize. Chlorinated tap water may slow fermentation slightly, so letting tap water sit uncovered for a few hours or using filtered water produces consistent results. The hydration ratio—the amount of water compared to flour—typically ranges from 75% to 80% for standard sourdough. A 500g flour batch with 400g water represents 80% hydration, creating a slightly sticky, extensible dough.

Salt typically comprises 2% of the flour weight. It controls fermentation speed, strengthens gluten structure, and enhances flavor. Adding salt too early (before the starter is fully mixed in) can kill some yeast cells, so most bakers mix salt in after the initial dough formation or dissolve it in water before adding.

Essential equipment includes a kitchen scale (accurate to at least 1g), a large mixing bowl, a bench scraper for handling sticky dough, a banneton or proofing basket (or a bowl lined with a floured towel), and a Dutch oven or covered baking vessel. A thermometer helps track dough temperature, which influences fermentation speed. A bread lame or sharp knife cuts the dough's surface before baking, controlling how it expands.

• Kitchen scale: Weighing ingredients produces consistent results; volume measurements vary
• Dutch oven: Traps steam during the first 20-30 minutes of baking, creating a crispy crust
• Banneton basket: Supports dough's shape during cold fermentation overnight
• Bench scraper: Handles wet, sticky dough without adding extra flour
• Instant-read thermometer: Monitors dough temperature (target: 75-78°F)
• Bread lame: Creates controlled scores that guide expansion

Practical Takeaway: Invest in a reliable kitchen scale as your first purchase. Weighing flour, water, and starter produces repeatable results, while volume measurements introduce variables. A Dutch oven is the second most important tool, as it creates the steam environment that develops a crispy, caramelized crust.

Mixing, Autolyse, and Building Gluten Structure

The mixing process begins with an autolyse—a 30-minute to 2-hour rest period after combining flour and water but before adding salt and starter. During this time, flour fully hydrates, gluten networks begin forming naturally, and enzymatic activity increases. This step reduces mixing time later and improves dough extensibility. The autolyse produces noticeably softer dough and requires less mechanical work.

After the autolyse, add your active starter and salt. Mix by hand or with a stand mixer until the ingredients fully incorporate. The dough should look shaggy and rough at this stage. Most home bakers use hand-mixing with the "pincer method"—using their thumb and fingers to lift and fold the dough from the bowl's sides toward the center, rotating the bowl as they work. This method takes about 5-10 minutes and builds initial structure without overworking the dough.

Gluten develops through a series of "stretch and folds" performed every 30 minutes over the first 2-3 hours of bulk fermentation. During each stretch and fold, grab one side of the dough and stretch it up and over toward the center, rotate the bowl 90 degrees, and repeat. Perform 4-6 repetitions per session. These folds align protein strands, creating a stronger network that traps gas bubbles more effectively. The dough gradually becomes smoother, more elastic, and less sticky as gluten develops.

Temperature significantly impacts fermentation speed during bulk fermentation. A dough at 75°F ferments faster than one at 68°F. Warmer kitchens allow shorter fermentation windows (4-5 hours), while cooler kitchens may require 6-8 hours or a cold overnight fermentation. Experienced bakers watch the dough's appearance rather than strictly following time—the dough should increase 50-75% in volume and show visible bubbles on the surface and sides.

• Autolyse: Rest flour and water 30 minutes to 2 hours before mixing
• Initial mix: Combine starter and salt; mix until ingredients fully incorporate
• First stretch and fold: 30 minutes after mixing; perform 4-6 folds
• Second stretch and fold: 30-60 minutes later; repeat 4-6 folds
• Third stretch and fold: Final session 30-60 minutes after second session
• Rest period: Allow 1-2 hours of undisturbed fermentation after final folds

Practical Takeaway: The stretch and fold technique replaces traditional kneading and works exceptionally well for wet sourdough doughs. Each session builds gluten incrementally without heating the dough or requiring heavy machinery. Watch for the dough surface to become smooth and bubbly rather than relying on a timer—visual cues indicate readiness better than elapsed time alone.

Shaping, Proofing, and Cold Fermentation

After bulk fermentation, the dough is ready for shaping. Gently turn the dough onto a lightly floured surface. Pre-shape the dough into a loose round by folding the edges toward the center repeatedly, creating tension on the surface. This pre-shaped round rests for 20-30 minutes—the "bench rest"—allowing the gluten to relax slightly before final shaping. During this rest, the dough develops a skin that helps maintain shape during final shaping.