100-Hydration Sourdough Bread Recipe: Fermented Crust With Open Crumb Magic

A 100-hydration sourdough bread recipe transforms your kitchen into a bakery with its signature open crumb and crispy crust. This high-hydration dough creates an airy, shapely loaf that rivals artisanal bakeries—no fancy equipment required. The secret lies in precise fermentation, where patience and technique unlock that coveted texture.

This recipe delivers a foolproof method for achieving restaurant-quality sourdough at home, with a hydration ratio that balances structure and openness. We’ll cover starter prep, bulk fermentation timing, and shaping techniques that prevent tears while maximizing oven spring.

The result? A loaf with a golden, crackling crust and an interior so open it practically sings.

What sets this apart is the deliberate approach to fermentation—controlling temperature and timing to develop flavor without overproofing. The dough’s high moisture content creates a tender crumb, but proper handling ensures it doesn’t collapse.

By the final slice, you’ll taste the difference: deep tang, crisp edges, and a texture that’s both rustic and refined.

Perfect for beginners eager to master sourdough or experienced bakers looking to elevate their technique, this recipe includes troubleshooting tips for common pitfalls. Let’s get started on your first 100-hydration masterpiece.

Ingredients for 100 hydration sourdough bread

Precision hydration and fermentation create this artisanal sourdough with signature open crumb and crispy crust.

The sourdough starter is the foundation—ensure it’s 100% hydration and bubbly with activity. For sourcing, King Arthur or Bob’s Red Mill flours provide optimal gluten structure, while Whole Foods or local bakeries often carry high-quality bread flour. The Diamond Crystal kosher salt enhances flavor without overpowering, and instant yeast (like Saf-Instant) accelerates fermentation if needed. Water temperature is critical: 75-80°F ensures proper gluten development without shocking the starter. For olive oil, California Avocado Ranch or Colavita deliver rich, fruity notes perfect for crust enhancement.

Substitutions require careful balance: whole wheat flour can replace up to 20% of all-purpose for nuttier flavor, but reduce water slightly to maintain hydration. Rye flour adds depth but may alter texture—use sparingly. No instant yeast? Active dry yeast works at double the amount, dissolved in warm water first. For scoring, semolina or rice flour both work, though semolina adds a subtle crunch. The diatomaceous earth (food-grade) boosts oven spring by creating steam channels—skip if unavailable, but expect slightly less dramatic rise. Always weigh ingredients for precision, especially with high hydration dough where water-to-flour ratios matter most.

Proper storage extends freshness: wrapped in a cotton towel inside a paper bag, the loaf stays fresh for 3-4 days at room temperature. For longer storage, freeze fully cooled loaves in airtight bags for up to 3 months—thaw at room temperature before toasting. The sourdough starter thrives in the fridge, fed daily with equal parts flour and water. Bulk fermentation can pause overnight in the fridge for slower, more controlled development. Always preheat the Dutch oven with the lid on for 45 minutes at 475°F to create the ideal steam environment for that signature crust.

Step-by-step instructions for 100-Hydration sourdough bread

Mastering this high-hydration dough transforms simple ingredients into artisanal bread with an open crumb and crisp crust.

In a large mixing bowl, combine the 0.5 cup active sourdough starter, 3.5 cups water, 4 cups all-purpose flour, and 2 cups unbleached white flour. Use a wooden spoon or dough whisk to mix until no dry flour remains—this ensures even hydration throughout the dough. The mixture will look shaggy and sticky, which is normal for high-hydration dough.

Add the 1.5 tsp kosher salt and 0.25 tsp instant yeast, then stir again. Let the dough rest for 10 minutes—this allows the flour to fully hydrate and the gluten to begin developing. After resting, fold the dough over itself 3-4 times using a wet spatula to strengthen the gluten structure without overworking it. This step is critical for achieving that signature open crumb.

Cover the bowl with a damp kitchen towel or plastic wrap and let the dough ferment at room temperature (70-75°F) for 4-6 hours, or until it has increased in volume by 50-75%. You’ll know it’s ready when the dough springs back slowly when poked and has developed small bubbles on the surface. For a faster rise, place the bowl in a warm oven with a bowl of hot water for 2-3 hours before switching to room temperature.

During fermentation, perform 2-3 sets of stretch-and-folds at 30-minute intervals after the initial 1-hour rest. To do this, wet your hands, grab one side of the dough, stretch it upward, and fold it over itself. Rotate the bowl and repeat—this builds strength and creates tension for oven spring. Avoid over-handling, as this can weaken the gluten.

Lightly flour a clean work surface and turn out the dough. Gently shape it into a loose round by pulling the edges toward the center and rotating the dough as you go. Place the shaped dough seam-side up in a banneton or bowl dusted with 0.25 cup cornmeal. Cover and refrigerate for 12-16 hours (or up to 24 hours) to allow for slow, cold fermentation. This step enhances flavor and improves texture.

If you’re short on time, you can perform a pre-shape and let the dough rest for 1 hour at room temperature before final shaping and cold proofing. The cold fermentation also tightens the gluten, making the dough easier to handle when you’re ready to bake. The longer it ferments, the more complex the flavor will be.

Preheat your oven to 475°F with a Dutch oven inside for 45 minutes. Remove the Dutch oven from the oven and carefully transfer the dough (still in its proofing container) to the hot pot. Dust the dough with 0.25 cup semolina flour and score the top with a razor blade or sharp knife—this prevents the dough from bursting open unexpectedly and allows steam to escape, creating an even rise.

Bake the bread uncovered for 20 minutes, then remove the lid and continue baking for an additional 20-25 minutes, until the crust is deep golden brown and the internal temperature reaches 205-210°F. For extra oven spring, sprinkle 1 tbsp diatomaceous earth over the dough before scoring—this creates a crisp, shatter-like crust while allowing steam to escape.

Remove the bread from the Dutch oven and transfer it to a wire rack to cool completely. Resist the urge to slice it immediately—allowing the bread to cool for at least 1 hour ensures the crumb sets properly and prevents gummy texture. The internal temperature should drop to 140°F before slicing. This patience pays off with a bread that’s crisp on the outside, tender on the inside, and packed with flavor.

Once cooled, slice the bread and serve with your favorite toppings. The open crumb structure should be visible, and each slice should hold its shape without falling apart. If stored properly in an airtight container at room temperature, this bread will stay fresh for 3-4 days, though it’s best enjoyed within the first 24 hours for peak texture and flavor.

Dietary considerations for this dish

Gluten-Free Adaptations

For a gluten-free version, replace the all-purpose and unbleached white flours with a 1:1 gluten-free bread flour blend like King Arthur Measure for Measure. Use 5 cups total (2.5 cups each for bulk fermentation and shaping) to maintain structure.

Add 1 tbsp xanthan gum to improve elasticity—this mimics gluten’s role in dough development. Expect a denser crumb, so extend bulk fermentation by 30-60 minutes to develop flavor. 🌾

Low-FODMAP Options

To make this bread low-FODMAP, swap the sourdough starter for 100% rye starter (fermented for 72 hours) and reduce to 0.25 cup—rye contains less fermentable oligosaccharides. Use white rice flour instead of wheat flours (4 cups total) and omit yeast entirely.

The fermentation process breaks down FODMAPs naturally, but test small batches first. Always check ingredient labels for hidden high-FODMAP additives.

Allergen-Free Considerations

For nut-free and egg-free baking, ensure all flours and oils are processed in dedicated facilities. Bob’s Red Mill gluten-free oats (certified allergen-free) can replace cornmeal for dusting. Use sunflower oil instead of olive oil if nut allergies are a concern—it provides similar moisture without flavor interference.

When scoring, opt for a sterilized razor blade to prevent cross-contamination if celiac disease is involved.

Reduced-Sodium Version

Cut the kosher salt to 0.75 tsp (about half) while boosting umami with 1 tbsp nutritional yeast during bulk fermentation. This maintains flavor depth without sodium. For extra tang, add 1 tsp apple cider vinegar to the water—it enhances sourdough character while keeping sodium low.

Taste the dough after mixing; if it needs more salt, add ¼ tsp at a time until balanced.

Keto-Friendly Substitutions

This recipe isn’t naturally keto, but you can create a low-carb version by replacing flours with almond flour (3 cups) and psyllium husk powder (2 tbsp)—the latter mimics gluten’s binding properties. Reduce water to 2.5 cups to prevent stickiness.

Add 1 tbsp ground flaxseed for moisture retention. Expect a denser texture; bake at 375°F for 30-35 minutes to avoid over-browning. The result won’t have an open crumb but offers a nutty, keto-compatible alternative.

Frequently asked questions