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Mastering the art of authentic San Francisco sourdough bread means embracing tradition—just flour, water, salt, and a living starter. This recipe captures the essence of the city’s iconic loaf: a crisp golden crust that shatters with each bite and a tangy, open crumb that’s impossible to resist.
I’ve perfected this method over years of baking, ensuring every step—from starter maintenance to high-heat baking—delivers restaurant-quality results at home.
The secret lies in patience and precision: a well-fed starter, careful fermentation times, and shaping by hand to develop gluten structure. Unlike commercial breads, this recipe relies on natural processes—no shortcuts, just time and technique.
The dough’s long bulk fermentation (12–16 hours) and proofing (2–4 hours) create that signature airy texture, while scoring before baking ensures an even rise and that coveted crackly crust.
What you’ll achieve is a loaf that smells like a bakery, tastes like tradition, and stands up to any bread lover’s expectations. The crust develops a deep caramel color, the crumb opens beautifully, and the tangy flavor comes from the starter’s wild yeast and lactic acid.
This isn’t just bread—it’s a labor of love, and every bite tells the story of its slow, natural journey.
Whether you’re baking for a crowd or treating yourself, this recipe scales perfectly and builds confidence. Troubleshooting tips for dense crumb or weak structure are included, so even first-time bakers can achieve success. Let’s get started on your first loaf of true San Francisco sourdough.
Ingredients for authentic san francisco sourdough bread
Four essential ingredients transform into San Francisco's legendary loaf: flour, water, salt, and a living starter.
| Ingredient | Amount | Notes |
|---|---|---|
| Unbleached Bread Flour 🌾 | 5 cups | High-protein for optimal gluten development |
| Active Sourdough Starter 🍞 | 2 cups | 100% hydration, peaked activity |
| Filtered Water 💧 | 3 ½ cups | Room temperature, 75°F |
| Diamond Crystal Kosher Salt 🧂 | 1 ½ tsp | Fine grain for even distribution |
| Extra-Virgin Olive Oil 🫒 | 1 tbsp | For dough handling and scoring |
| Cornmeal 🌽 | ½ cup | For dusting banneton and peel |
| Rice Flour 🌾 | 1 tbsp | Optional for scoring dust |
| Instant Yeast 🍞 | ¼ tsp | Reserve for backup fermentation |
The unbleached bread flour is non-negotiable—King Arthur or Caputo deliver the high-protein content (12-13%) needed for that signature open crumb. Bulk bins at Whole Foods or specialty mills like Millennium Flour offer the best quality. For the starter, 100% hydration is critical; discard any that smells alcoholic or fails the float test (dropped in water should rise). The Diamond Crystal kosher salt is preferred over table salt due to its finer grain—Morton's works in a pinch but lacks the delicate distribution of Diamond Crystal. Filtered water eliminates impurities that could hinder fermentation; tap water may require 24-hour settling if your municipal supply contains chlorine.
No active starter? Capture wild yeast by mixing 1 cup flour and 1 cup water, letting it ferment at room temperature for 5-7 days until bubbly. Salt substitutes like sea salt work but may alter flavor balance—adjust to taste. Olive oil should be cold-pressed extra-virgin (look for California-grown brands like Corto or Lucini) for authentic flavor infusion during shaping. Cornmeal for dusting can be swapped for semolina, though cornmeal's slight sweetness complements the sourdough's tang. Rice flour for scoring is optional but creates a beautiful contrast against the crust's caramelization—Bob's Red Mill is a reliable brand. The instant yeast acts as a safety net for weak starters during bulk fermentation.
Store unbleached flour in an airtight container for 3 months; sourdough starter thrives in the fridge for up to 2 weeks (feed weekly) or freezes indefinitely in 1:1 flour ratios. Olive oil should be refrigerated after opening and used within 6 months. Cornmeal keeps indefinitely in a cool, dark place. For dough preparation, mix all ingredients in a large stainless steel bowl—avoid aluminum, which can react with acidic dough. Fermented dough can be refrigerated for up to 24 hours before shaping, though room-temperature fermentation yields superior results. Baked loaves stay fresh for 3-4 days when wrapped in a clean kitchen towel
Why You'll Love This Recipe
- No-Knead Magic: I swear by this recipe because it’s the only sourdough that doesn’t demand my entire weekend. Just mix the unbleached bread flour, active starter, and filtered water—no fancy equipment, no overworking the dough. The kosher salt does all the work while I’m scrolling through my phone.
- Tangy, Crusty Bliss: That first bite? The crispy olive-oil brushed crust with a chewy interior and a faint, wild tang from the starter? It’s the kind of flavor that makes you pause mid-slice. Honestly, store-bought loaves can’t touch this—especially when you control the saltiness and fermentation.
- Weeknight Workhorse: I make this twice a week—once for toast in the morning, once for sandwiches I prep ahead. The leftovers stay fresh for days, and the slices toast up perfectly every time. (Yes, even on a Tuesday night when I’m exhausted.)
- Budget-Friendly Staple: A single batch feeds my family for days, and the ingredients? Basic. No pricey add-ins, just flour, water, and a little olive oil for that golden crust. It’s the kind of bread that makes grocery bills feel lighter while my kitchen smells amazing.
Step-by-step instructions for authentic San Francisco sourdough bread
Master the art of San Francisco sourdough with this proven method for crisp golden crust and open crumb structure.
Mix the Dough with Precision
In a large mixing bowl, combine the 5 cups unbleached bread flour with the 2 cups active sourdough starter. Make a well in the center and add the 3.5 cups filtered water at room temperature. The dough should begin to come together immediately due to the high hydration and active starter.
Gradually incorporate the 1.5 tsp diamond crystal kosher salt and 1 tbsp extra-virgin olive oil into the flour mixture. Using a dough whisk or your hands, mix until a shaggy dough forms. The dough will be extremely sticky at this stage—this is normal for high-hydration sourdough. Avoid adding extra flour as it will weaken the gluten structure.
Once all ingredients are incorporated, perform a stretch-and-fold every 30 minutes for 2 hours. This technique develops gluten strands while allowing the starter to fully hydrate. After each fold, the dough should become smoother and more cohesive. You'll know you're on track when the dough springs back slowly when poked with your finger.
Bulk Ferment for Optimal Flavor Development
Cover the bowl with a damp kitchen towel and let the dough ferment at room temperature for 4-6 hours. The dough should rise by about 50-75% during this time. Look for bubbles forming on the surface and a slight jiggle when the bowl is gently shaken—these are signs of active fermentation.
After 4 hours, perform a float test: drop a small piece of dough into a glass of water. If it floats, the gluten has developed sufficiently. If not, continue fermenting for another hour. The dough should be at its peak when it passes this test and shows good volume increase. This fermentation stage is crucial for developing the signature tangy flavor of San Francisco sourdough.
For a more authentic approach, I recommend fermenting overnight in the refrigerator after the initial 4-6 hours. This cold fermentation enhances flavor complexity and makes scoring easier. The dough will rise slowly in the fridge, developing deeper flavors without overproofing.
Shape and Prepare for Final Proof
Turn the dough out onto a lightly cornmeal-dusted surface. The 0.5 cup cornmeal will prevent sticking and create that classic rustic texture. Using wet hands, gently shape the dough into a tight round boule. The surface should be smooth with no cracks—this indicates proper tension.
Place the shaped dough seam-side up in a well-floured banneton (proofing basket). Cover with a damp towel and refrigerate for 8-12 hours. This cold proof allows the gluten to relax while maintaining structure. The dough should rise noticeably but not overflow the basket. For best results, proof for 12 hours to develop maximum flavor.
When ready to bake, turn the dough out onto a piece of parchment paper dusted with cornmeal. Use a sharp razor or lame to score the dough in a crosshatch pattern. This creates steam channels for the oven spring and gives that iconic San Francisco sourdough appearance. The cuts should be about 1/8-inch deep and made with confidence—hesitation leads to uneven scoring.
Bake with High Heat for Crispy Crust
Preheat your oven to 475°F with a baking stone or steel inside. Place the scored dough directly on the stone or steel, then immediately pour 1 cup of boiling water into a heatproof bowl and place it on the lower oven rack. The steam creates the perfect environment for oven spring and crisp crust formation.
Bake for 20 minutes with the steam bowl in the oven, then remove the bowl and continue baking for 25-30 minutes until the bread reaches an internal temperature of 205-210°F. The crust should be deep golden brown with dark brown spots, and the bread should sound hollow when tapped on the bottom.
For that authentic San Francisco touch, I recommend baking in a Dutch oven if you don't have a baking stone. The contained steam creates an even more crisp crust. Let the bread cool completely on a wire rack before slicing—this allows the crumb to set properly and prevents a gummy texture.
Pro Tips For Making Authentic San Francisco Sourdough Bread
- Use a Dutch Oven: DESCRIPTION: San Francisco sourdough needs steam to get that iconic crackly crust and open crumb. A heavy Dutch oven traps heat and moisture—no fancy equipment needed. If you don’t have one, a cast-iron skillet or even a baking stone with a tray of boiling water works, but the oven is the gold standard. Preheat it with the bread for 30 minutes so it’s scorchingly hot before you drop that dough in.
- Weigh Your Dough: DESCRIPTION: I used to eyeball the flour, and my batches turned out inconsistent. For SF sourdough, precision matters—especially with the starter-to-flour ratio. Use a kitchen scale for the dough and the starter; even a 5% variation in hydration (like 75% vs. 80%) changes the texture. Trust me, your future loaves will thank you.
- Don’t Over-Knead: DESCRIPTION: SF sourdough relies on long fermentation, not brute force. After the initial stretch-and-folds, let the dough rest between each set—about 30 minutes at room temp. Overworking it develops gluten too early, and your bread will taste dense instead of airy. Think gentle folds, not punching.
- Salt the Water: DESCRIPTION: Dissolve the Diamond Crystal kosher salt directly into the water before mixing it with flour and starter. This ensures even distribution—no clumpy bits hiding in the dough. I learned this the hard way when I sprinkled it in later and ended up with salty pockets. Also, use 2% of the flour weight (about 10g per 500g flour) for that perfect tangy crunch.
Dietary considerations for this recipe
Gluten-Free Adaptations
Traditional San Francisco sourdough relies on gluten for its signature open crumb, but gluten-free versions are possible with the right blends. Use a 1:1 gluten-free bread flour blend like King Arthur Measure for Measure or Cup4Cup, which includes xanthan gum for structure.
Replace 5 cups regular flour with 5 cups gluten-free blend and increase hydration slightly to 3.75 cups water—gluten-free doughs need extra moisture. 🌾
Low-FODMAP Options
For those avoiding fermented foods, reduce the starter to 1 cup and add ¼ tsp instant yeast to ensure proper rise. Use white rice flour (instead of cornmeal) for dusting to cut fermentable carbs.
The dough will ferment faster, so monitor closely during bulk fermentation. Always test your starter’s activity—if it’s too aggressive, shorten fermentation time to 3-4 hours total.
Dairy-Free Considerations
This recipe is naturally dairy-free, but the olive oil plays a key role in handling the sticky dough. If you’re avoiding oils, dust your hands and surface with arrowroot powder instead of cornmeal—it prevents sticking without adding fat.
For extra crispness, brush the baked loaf with flaxseed milk (mix 2 tbsp ground flaxseed with 6 tbsp water) before serving.
Nut-Free Alternatives
The recipe includes no nuts, but if you’re concerned about cross-contamination, ensure all tools (bowls, utensils) are thoroughly cleaned. For scoring, use a clean razor blade or lamé instead of pre-dusted rice flour.
Store finished bread in an airtight container with a paper towel to absorb moisture—this prevents sogginess without relying on nut-based additives.
Sugar-Free Modifications
This recipe is already sugar-free, but if you’re monitoring carbs, verify your flour’s net carbs—King Arthur unbleached bread flour has 2g net carbs per ¼ cup. For a lower-carb option, substitute ½ cup flour with ½ cup almond flour (though texture will differ slightly).
The tangy flavor from the starter remains unchanged, so the bread’s signature taste stays intact. 💡
Nutrition facts
Frequently asked questions
Why does San Francisco sourdough have such a distinct tang?
The signature tang comes from the wild yeast and lactic acid bacteria in the 100% hydration sourdough starter. During the 12-16 hour bulk fermentation, these microbes break down flour sugars into organic acids, creating that signature tangy flavor. The longer cold proof (8-12 hours) further enhances this complexity by slowing fermentation and concentrating flavors.
What’s the best way to test if my starter is ready?
Perform the float test: Drop a small piece of starter into a glass of water. If it floats within 5-10 seconds, it’s active and ready. For San Francisco sourdough, aim for a starter that’s bubbly, slightly domed, and passes this test before mixing. A strong starter should also smell pleasantly tangy—not alcoholic or putrid.
Can I use a Dutch oven instead of a baking stone?
A Dutch oven is ideal for authentic San Francisco sourdough. Place the dough inside with the lid on for the first 20 minutes to trap steam, then remove the lid and bake for another 25-30 minutes. The contained steam creates the perfect environment for oven spring and that signature crisp crust. Just ensure your Dutch oven is preheated with the dough.
Why did my bread turn out dense instead of open and airy?
Dense bread usually results from underdeveloped gluten or overproofing. Ensure you perform stretch-and-folds every 30 minutes during the first 2 hours of bulk fermentation. Also, check your starter’s strength—weak starters can’t properly leaven the dough. If the dough overflows the banneton during proofing, it’s overproofed. For best results, aim for a 50-75% rise during bulk fermentation.
How do I store leftover sourdough?
Wrap cooled loaves in a clean kitchen towel or paper bag and store at room temperature for up to 3 days. For longer storage, freeze slices in an airtight container for up to 3 months. To revive, toast frozen slices directly in the toaster or warm in a 350°F oven for 5-10 minutes. Avoid plastic bags—they trap moisture and make bread soggy.