Authentic San Francisco Sourdough Bread Recipe: Slow-Fermented Tang for Crusty Open Crumb

This authentic San Francisco sourdough bread recipe delivers the iconic tangy flavor and open, airy crumb that makes it legendary. 🌟 The secret lies in a 72-hour fermentation—longer than most recipes—where wild yeast and bacteria develop complex flavors and a signature sour bite.

I’ve perfected this method after years of baking, capturing the essence of San Francisco’s historic sourdough culture in every loaf.

What sets this recipe apart is the high-hydration dough, which creates that coveted open crumb and crispy crust. You’ll start with a well-maintained starter (or learn how to create one), then follow a precise process: autolyse, bulk fermentation, shaping, and proofing—all critical for achieving the right texture.

The key? Patience and control over temperature and humidity, which transform simple flour and water into something extraordinary.

By the time you slide that loaf into the oven and blast it with steam, you’ll be rewarded with a golden-brown crust, an irresistibly tangy aroma, and a crumb so open it practically melts in your mouth.

This is the bread that built San Francisco’s reputation—and now, it’s yours to bake at home. The crust will shatter with each bite, while the interior remains tender and chewy, with just the right amount of sourness.

Whether you’re baking for a crowd or treating yourself to a taste of tradition, this recipe delivers restaurant-quality results with a method that’s both authentic and approachable. Let’s get started on creating your own piece of San Francisco history, one loaf at a time.

Ingredients for authentic san francisco sourdough bread

High-hydration flour, active starter, and precise fermentation create legendary San Francisco sourdough.

The King Arthur Bread Flour or Caputo Tipo 00 are my go-tos for that signature open crumb—high protein holds up to the long fermentation. Your sourdough starter should be 100% hydration and fed with equal parts flour and water 12 hours before baking. San Francisco’s historic bakeries use a 72-hour cold ferment, but I’ve adapted this for home ovens with a 24-hour bulk ferment at 72°F. If your kitchen runs cooler, extend the bulk fermentation by 6-12 hours. For the starter, King Arthur or Bob’s Red Mill flours work best—they’re consistent and reliable. Avoid whole grain flours here; they can disrupt the delicate gluten structure.

No Dutch oven? A heavy oven-safe pot with lid works in a pinch, but the steam circulation is critical. Running out of rice flour? Semolina or all-purpose flour dusts just as well for scoring. The honey or maple syrup in the starter feeding isn’t optional—it helps activate the yeast without overpowering the tang. If you’re using a banneton, line it with a floured towel to prevent sticking. For scoring, a lame gives the cleanest cuts, but a razor blade works too—just dip it in flour first. The ice cubes create steam when they melt, mimicking the professional deck oven environment. Pro tip: Chill your dough overnight before final proof for better oven spring.

This dough is best baked fresh, but you can shape it up to 24 hours ahead and proof in the fridge. Store any leftovers in a paper bag at room temperature for 2-3 days—it’ll keep better than plastic. For freezing, slice the cooled loaf and store in a ziplock bag for up to 3 months. The crust hardens as it cools, so rewarm slices in a 350°F oven for 5 minutes to restore that bakery-fresh crunch. The open crumb is at its peak 2-3 days after baking, when the starches fully retrograde. Trust me, the first slice is worth the wait.

Step-by-step instructions for authentic San Francisco sourdough bread

Here's how to capture that iconic tang and open crumb—no shortcuts, just patience and precision.

In a large bowl, combine the 3.5 cups unbleached bread flour, 1 cup active sourdough starter, 1.5 tsp kosher salt, and 0.5 tbsp honey or maple syrup. I like to use a wooden spoon first to break up any dry pockets before gradually adding the 2.5 cups filtered water while stirring. The dough should come together into a shaggy mass—don't worry if it looks messy at this stage.

Once all the water is incorporated, switch to your hands and knead for about 5 minutes until the dough becomes smooth and elastic. You'll know it's ready when it springs back slowly when poked. This high-protein flour needs that extra kneading to develop proper gluten structure for that classic open crumb. If the dough feels too sticky, add 1-2 tablespoons of flour—just enough to make it manageable.

Place the dough in a lightly oiled bowl, cover it with a damp towel, and let it ferment at room temperature (70-75°F) for 4-6 hours. Here's the thing—this slow fermentation is what creates that signature San Francisco tang. You'll see the dough nearly double in size and develop small bubbles throughout. Punch it down every 90 minutes to redistribute the yeast and strengthen the gluten.

After the initial bulk fermentation, transfer the dough to the refrigerator and let it cold-proof overnight (12-16 hours). This cold fermentation slows yeast activity, allowing more complex flavors to develop. The dough will rise more slowly but end up with better flavor and structure. I like to place the bowl in the fridge's coldest section for maximum consistency.

Lightly dust your banneton or colander with 0.25 cup rice flour—this prevents sticking and helps create that beautiful scored pattern. Turn the dough out onto a clean surface and gently shape it into a round boule. I use the "stretch and fold" method: stretch one side of the dough toward you and fold it over itself, then rotate and repeat. This builds tension in the dough for better oven spring.

Place the shaped dough seam-side up in the floured banneton, cover it with a damp towel, and let it proof at room temperature for 1-2 hours until it's about 50% larger. The dough should feel springy when pressed gently. If it's not rising enough, it might need more time—don't rush this step. The final proof is crucial for that signature open crumb structure.

Place the dutch oven (with lid) in a 475°F oven for 45 minutes to preheat thoroughly. This high heat is essential for creating that crispy crust. While it's heating, turn the dough out onto the parchment paper, gently removing it from the banneton. Dust the top with 0.25 cup cornmeal for scoring.

Using your lame or razor blade, make a ½-inch deep slash down the center of the dough. The blade should cut through to the bottom—this allows the bread to expand properly. Here's the moment that matters: the blade should be sharp enough to cut cleanly without tearing the dough. If it sticks, you'll know the dough needs more proofing time.

Carefully transfer the parchment and dough to the preheated dutch oven. Add 1 cup ice cubes to the bottom of the oven (or place them on a tray) to create instant steam when you close the lid. Bake covered for 20 minutes, then remove the lid and bake for another 20-25 minutes until the bread reaches 205-210°F internally and has a deep golden-brown crust.

You'll know it's done when the bread sounds hollow when tapped on the bottom and the crust has that characteristic crackly texture. Let it cool on a wire rack for at least 1 hour before slicing—this resting period allows the crumb to fully develop. The bread should have a crisp exterior, an open crumb structure, and that unmistakable tangy flavor that makes San Francisco sourdough so special.

Troubleshooting this recipe

Dense Dough Issues

If your dough feels too dense after mixing, you likely need more gluten development. Try kneading for an extra 2-3 minutes or perform 3-4 stretch-and-folds during bulk fermentation. High-protein flour like King Arthur Bread Flour requires more handling—don’t rush this step.

If the dough still feels heavy, add 1 tablespoon flour at a time until it becomes slightly tacky but manageable. Over-mixing can also cause density, so stop when the dough springs back slowly when poked. 💪

Poor Rise or Flat Loaf

A flat loaf usually means underproofing or weak gluten structure. First, check your starter—it should float in water before use. If your dough isn’t rising enough, extend bulk fermentation by 2-4 hours or try a longer cold proof (18-24 hours).

For shaping, ensure you’re building tension with stretch-and-folds or the boule method. If the dough collapses after scoring, it may need more proofing time or a warmer environment (try placing it near your oven’s pilot light).

Blotchy or Pale Crust

A pale crust often results from insufficient steam or uneven heat distribution. Preheat your Dutch oven for at least 45 minutes to ensure it’s fully hot. When baking, add 1 cup ice cubes to the oven floor to generate steam.

If your oven runs dry, place a tray of boiling water on the lower rack instead. For extra color, broil for 1-2 minutes at the end of baking—just watch closely to avoid burning. A hotter oven (500°F) for the last 5 minutes can also help develop that golden crust. 🔥

Gummy or Underbaked Interior

An underbaked center usually means the dough wasn’t fully proofed or baked long enough. Use an instant-read thermometer to check internal temp—it should reach 205-210°F. If the crumb feels gummy, extend baking time by 5-10 minutes with the lid off to evaporate excess moisture.

For future loaves, ensure your final proof is 50% larger before baking. A longer bulk fermentation (8-12 hours) can also improve oven spring and reduce gumminess.

Excessive Stickiness

Sticky dough is normal with high-hydration sourdough, but it should be workable, not glue-like. If it’s too wet, add 1-2 tablespoons flour during mixing or dust your work surface generously. For shaping, use a well-floured banneton or colander—rice flour works best.

If the dough sticks during scoring, chill it for 15-20 minutes to firm up before slicing. Overhydration can also happen if your starter is too wet—aim for a 100% hydration starter (equal parts flour and water by weight).

Frequently asked questions