65% Hydration Sourdough Bread Recipe: Tangy Crust and Open Crumb Mastery

Mastering 65% hydration sourdough bread transforms your kitchen into a bakery—where each loaf delivers that signature tangy crust and open, airy crumb. The key lies in understanding how this higher hydration ratio (water to flour) creates a more extensible, flavorful dough that demands patience and precision.

I’ve baked dozens of batches to perfect the balance between structure and openness, ensuring your loaves rise beautifully without collapsing.

This recipe starts with a robust starter and focuses on proper bulk fermentation times to develop gluten strength and flavor. The dough’s increased moisture requires careful handling—stretching and folding techniques become your best friends to build structure without overworking the gluten.

When baked with steam, the crust develops that coveted tangy snap while the interior remains tender and open, with pockets large enough to hold thick slices of butter.

What you’ll achieve is a loaf that’s both visually stunning and delicious—golden crust with deep cracks, a crumb so open it’s almost cloud-like, and a flavor profile that’s complex and satisfying. The higher hydration creates a lighter texture while intensifying the sourdough tang, making every bite worth the effort.

Whether you’re a seasoned baker or just starting, this method will elevate your bread game.

Ready to tackle the challenges and rewards of higher-hydration dough? Let’s walk through each step—from mixing to baking—to help you achieve that perfect balance of structure and openness. The results will speak for themselves.

Ingredients for 65 hydration sourdough bread

Precision ingredients for that perfect 65% hydration sourdough with cloud-like crumb and tangy crust.

The flour choice is non-negotiable here—King Arthur or Caputo Tipo 00 are my go-tos, but any high-protein unbleached will work. The sourdough starter needs to be at its peak (50-75% hydration, bubbly with a slight tang)—feed it 12 hours before mixing for maximum activity. For the white whole wheat flour, look for brands like Bob’s Red Mill; it adds subtle depth without overpowering the sourdough’s signature tang. Rice flour might seem odd, but it’s a game-changer for oven spring—Bob’s Red Mill again, or any food-grade variety. The olive oil? Skip the cheap stuff—California Avocados or Colavita make all the difference in that golden crust.

No King Arthur flour? Bread flour with 1 extra tbsp mimics the protein content. Swapping the white whole wheat? Substitute with spelt flour at 1:1 ratio, but expect a slightly denser crumb. Running low on rice flour? Cornstarch at half the amount works in a pinch, though it lacks the same structural boost. The honey or maple syrup is just for feeding your starter—if you’re strictly avoiding sweeteners, unsweetened applesauce works too. And for that olive oil? Avocado oil is a neutral alternative, but it won’t give you the same fruity depth. Pro tip: Toast your rice flour for 5 minutes before mixing—it adds a subtle nuttiness that pairs perfectly with the sourdough tang.

This dough is a beast to handlestarter in the fridge between feedings to keep it fresh for up to 2 weeks, but bring it to room temp and feed it 12 hours before mixing for peak performance. The dough scraper is your new best friend—keep it floured and ready to avoid a sticky mess. Once shaped, cover your banneton with a damp towel and refrigerate for up to 16 hours if you need to delay baking. The cornmeal? Save it—it’s perfect for dusting your final loaf before scoring. And that steam generator? No fancy equipment needed—just a metal bowl with boiling water on the oven floor does the trick.

Step-by-step instructions for 65% hydration sourdough bread

Here’s how to transform your starter into a loaf with a crackly crust and airy crumb—every detail matters.

In a large mixing bowl, combine the 500 g unbleached all-purpose flour and 325 g filtered water (room temperature). Use your hands or a dough scraper to break up any dry spots until you have a shaggy, sticky mass. This initial mix, called an autolyse, allows the gluten to begin developing while we prepare the remaining ingredients.

Cover the bowl loosely with plastic wrap and let it rest for 30 minutes. You’ll notice the dough becomes smoother and more cohesive—this is gluten forming the structural network that gives sourdough its signature open crumb. The autolyse also makes the final mixing and shaping easier, preventing overworked gluten later.

After the autolyse, add the 160 g active sourdough starter, 10 g kosher salt, 5 g honey or maple syrup, 100 g white whole wheat flour, 20 g rice flour, 10 g olive oil, and 10 g instant vital wheat gluten to the bowl. Using your hands, mix vigorously for 5-7 minutes until all ingredients are fully incorporated and the dough becomes smooth and elastic.

This is where the magic happens—the starter introduces wild yeast and bacteria that create the tangy flavor, while the gluten develops structure. The rice flour boosts oven spring, and the olive oil adds richness. Test the dough’s readiness by performing the “windowpane test”: wet your hand, grab a small piece of dough, and stretch it gently. If it thins to a translucent membrane without tearing, it’s ready.

Shape the dough into a loose ball, cover it with a damp towel, and let it ferment at room temperature (70-75°F) for 4-5 hours. Every 30 minutes during the first 2 hours, perform a set of three stretch-and-folds: wet your hand, grab one side of the dough, stretch it upward, and fold it over itself. Rotate the bowl 90 degrees between each fold to ensure even gluten development.

During bulk fermentation, the dough should nearly double in size and develop bubbles throughout. The folds strengthen the gluten structure, preventing an overly dense crumb. If the dough feels too sticky, sprinkle a little more unbleached all-purpose flour (from your original 500 g) onto your hands as needed. The dough is ready when it passes the “poke test”—press your finger gently into the dough; if it springs back slowly (like Jell-O), it’s perfect.

Shape the dough into a tight round by gathering the edges toward the center and tucking them underneath. Place it seam-side up in a banneton or loaf pan lined with a floured linen towel or dusted with 2 tbsp cornmeal. Cover loosely and refrigerate for 12-16 hours. This cold proofing slows fermentation, allowing flavors to deepen and the gluten to relax, making shaping easier later.

During cold proofing, the dough will rise slowly but steadily. The cold temperature also helps create a more open crumb by allowing the yeast to work gently. If you’re short on time, you can skip the cold proof and do a 1-hour room-temperature proof instead, but the flavor won’t be as developed.

Preheat your oven to 450°F with a steam generator (or a metal bowl of boiling water) on the bottom rack. Turn the dough out onto a floured surface, shape it into an oval or round loaf, and place it onto a piece of parchment paper. Use a dough scraper to create tension on the surface—this helps the loaf expand evenly in the oven.

Score the dough with a sharp razor or lame by making a ½-inch deep cut down the center. This controlled cut directs the oven spring and prevents the loaf from bursting unpredictably. Bake the loaf for 20 minutes with the steam generator in place, then remove the steam and bake for another 20-25 minutes until the crust is a deep golden brown and the internal temperature reaches 205-210°F. The bread is done when it sounds hollow when tapped on the bottom.

Remove the loaf from the oven and transfer it to a wire rack. Let it cool completely for at least 1 hour before slicing—this allows the crumb to set and prevents a gummy texture. The bread should have a crackly crust with a tangy aroma and an open, airy crumb with visible holes.

Slice the loaf and serve it warm with your favorite toppings. The white whole wheat flour adds a subtle nutty flavor, while the rice flour ensures a light, airy texture. Store any leftovers in an airtight container at room temperature for up to 3 days or freeze for longer storage. Each slice should deliver that perfect balance of chewy crust and tender crumb—proof that patience and precision pay off.

Essential equipment for 65 hydration sourdough bread

Starter Essentials

Your sourdough starter is the heart of this recipe, so equip yourself with a glass jar or ceramic crock (I love my Pyrex 2-quart jar) for easy monitoring. A digital kitchen scale (like the OXO Good Grips) ensures precise measurements—critical for maintaining that 65% hydration ratio.

Keep a small spoon (preferably silicone) for stirring and a rubber band to mark growth levels on your jar. 🌱

Mixing and Handling

A large stainless steel bowl (I use 12-quart capacity) is non-negotiable for mixing—it handles the sticky dough better than glass. Your dough scraper should be stainless steel (like Nordic Ware’s) with a flexible edge for stretching and folding.

For autolyse, a plastic wrap or damp kitchen towel keeps the dough from drying out. Don’t skimp on a high-quality razor blade (I prefer Japanese-style lames) for scoring—it ensures clean cuts. ✂️

Fermentation Tools

During bulk fermentation, a digital thermometer (like Thermoworks Thermapen) helps track your kitchen’s temperature—ideal range is 70-75°F. For cold proofing, a banneton (I use Kitchentown’s linen-lined version) is ideal, but a loaf pan works in a pinch.

Line it with a floured linen towel or dust with cornmeal to prevent sticking. A small spray bottle with water keeps your dough’s surface moist during proofing. ❄️

Baking Setup

Your oven needs a steam generator—I use a metal bowl with boiling water on the bottom rack, but a steam pan (like Ooni’s) is a game-changer. A heavy-duty baking stone (I swear by Emil’s 16×20-inch) creates that perfect oven spring.

For cooling, a wire rack (preferably stainless steel) prevents soggy bottoms. And finally, a digital instant-read thermometer (like Thermoworks Smoke) ensures your loaf hits 205-210°F internally. 🔥

Storage Solutions

Once baked, store your loaf in an airtight container (I love Cambro’s 1-gallon container) to maintain freshness. For freezing, plastic wrap + freezer bag combo works best—slice before freezing to prevent freezer burn.

A sharp serrated knife (like Mercer Culinary’s) ensures clean slices without crushing the crumb. Keep a small notebook to track your batches—note hydration adjustments, fermentation times, and oven temps for future reference. 📔

Frequently asked questions