America's Test Kitchen Sourdough Bread Recipe: No-Knead, Crusty Perfection

America's Test Kitchen sourdough bread recipe delivers crusty perfection with a foolproof no-knead method that even beginners can master. The secret lies in precise fermentation times and oven techniques developed through rigorous testing—no guesswork, just reliable results every time.

I’ve baked countless loaves using this approach, and the difference in texture and flavor is unmistakable compared to traditional methods.

This recipe simplifies the process without sacrificing authenticity, using a simple starter maintenance routine and minimal handling to achieve an open crumb structure and crackly crust.

The no-knead technique saves time while developing deep flavor through slow fermentation, making it ideal for home bakers who want restaurant-quality bread without the complexity. Perfect for those who appreciate proven methods over trial and error.

By the time you pull that golden-brown loaf from the oven, you’ll have a crusty exterior with a soft, airy interior—exactly what makes sourdough worth the effort. The aroma alone will transform your kitchen into a bakery, and the flavor profile is rich, tangy, and complex.

Whether you’re feeding a family or treating yourself, this recipe ensures perfect results with every batch.

Ready to bake? We’ll cover everything from starter care to shaping and baking techniques, including tips for whole grain or seeded variations. Let’s get started with a method that’s been perfected by culinary experts—and now, by you.

Ingredients for america's test kitchen sourdough bread

Four key ingredients transform simple flour into restaurant-quality sourdough—no kneading required.

The sourdough starter is non-negotiable here. King Arthur or Bob’s Red Mill flours work best for structure, but any high-protein unbleached will do. The 100% hydration starter should be bubbly and smell tangy—if it’s flat, feed it 12 hours before baking. For the whole wheat flour, Bob’s Red Mill or King Arthur brands keep the texture open. The sugar is just enough to feed the starter without over-sweetening. Salt? Diamond Crystal dissolves cleaner than table salt—trust me on this. Water temp matters: too hot kills yeast, too cold slows fermentation.

No sourdough starter? Store-bought active dry yeast at half the amount works in a pinch, but you’ll lose that signature tang. Whole wheat flour out of stock? Spelt flour or extra all-purpose keeps the dough manageable. The olive oil is optional but makes shaping easier—California Olive Ranch is my go-to for reliable quality. Cornmeal? Bob’s Red Mill is finely ground and won’t clump. Ice water might sound dramatic, but it’s what creates the tight gluten structure for that crackly crust. No ice? Cold water from the fridge works, just let it sit 5 minutes first.

This dough keeps 24 hours in the fridge before shaping—perfect for overnight prep. Once shaped, it’s best baked immediately for maximum oven spring. The loaf reheats beautifully: 10 minutes at 350°F wrapped in foil revives that bakery-fresh aroma. For leftovers, slice and freeze—3 months in a sealed bag, toast straight from frozen. The crust gets harder as it cools, so eat it fresh or reheat to restore crispiness.

Step-by-step instructions for america's test kitchen sourdough bread

Here's the method that delivers that signature ATK crusty, open crumb—no kneading required.

In a large mixing bowl, combine the 3.5 cups all-purpose flour, 0.5 cup whole wheat flour, 0.5 tsp granulated sugar, and 1.5 tsp diamond crystal kosher salt. Whisk to eliminate any flour pockets, then create a well in the center. This ensures even distribution of ingredients throughout the dough.

To the dry ingredients, add the 0.5 cup active sourdough starter and 1.5 cups water. Stir with a wooden spoon until just combined—you're looking for a shaggy, sticky mass that comes together when you press it. Avoid overmixing at this stage; you want to preserve the gluten structure for that perfect open crumb. The dough should be wetter than traditional sourdough—think more like a thick batter than a workable ball.

Cover the bowl with plastic wrap and let the dough rest at room temperature for 12 to 18 hours. This long fermentation develops maximum flavor and allows the gluten to relax. I like to place the bowl on my countertop away from direct sunlight—consistent 70°F to 75°F temperatures yield the best results. The dough will rise slightly, develop bubbles, and become noticeably more elastic as the starter ferments.

After resting, the dough should look like a thick, jiggly pudding with small bubbles on the surface. If it hasn't risen much, don't worry—this is normal for the no-knead method. The key is the increased volume and improved texture, not dramatic height. This resting period is where the magic happens—complex flavors develop and the dough becomes ready for shaping.

Lightly dust a clean work surface with the 0.25 cup cornmeal. Turn out the dough and gently shape it into a round boule by pulling the edges toward the center. The dough will be sticky, so wet your hands occasionally to prevent sticking. Don't worry about perfect symmetry—the goal is to create surface tension that helps the bread expand during baking.

Place the shaped dough on a parchment-lined baking sheet, seam-side up. Cover loosely with plastic wrap and let it proof at room temperature for 1 to 2 hours, or until it has visibly expanded by about 25%. The dough should feel firm to the touch and spring back slowly when poked. This final proofing stage is crucial for that signature open crumb structure.

Preheat your oven to 450°F with a Dutch oven inside for 45 minutes. This intense preheating is what creates that signature ATK crust. Carefully transfer the dough (still on its parchment) into the hot Dutch oven, cover tightly, and bake for 30 minutes. The steam trapped inside creates that perfect oven spring and tender crumb.

After 30 minutes, remove the lid and continue baking for another 15 to 20 minutes until the bread reaches an internal temperature of 205°F to 210°F. You'll know it's done when the crust is deep golden brown with dark spots and sounds hollow when tapped on the bottom. The aroma should be intoxicating—sweet, tangy, and slightly nutty from the whole wheat flour.

Remove the bread from the Dutch oven and place it on a wire rack to cool completely for at least 1 hour. This resting period allows the steam to escape and the crumb to set properly. I know it's tempting to slice into that warm, crusty loaf immediately, but patience here makes all the difference—each slice will be perfectly structured with that signature open crumb.

Once cooled, slice the bread with a serrated knife for clean cuts that showcase the beautiful interior. The crust should be crisp and shatterable, while the interior reveals that characteristic open crumb structure with pockets of air. Serve warm with butter or olive oil for the ultimate sourdough experience—this bread tastes even better the next day as the flavors continue to develop.

Storing and reheating your leftovers

Room-Temp Storage

Freshly baked sourdough keeps beautifully at room temperature for 2-3 days wrapped in a clean kitchen towel or inside a paper bag. The towel breathes better than plastic, preventing sogginess while maintaining that crackly crust.

Store it in a cool, dark place like a bread box or countertop away from direct light—this preserves moisture and prevents staling. I like to place mine in a wooden bread box to keep it at a consistent temperature. 🌾

Fridge Preservation

For longer storage, refrigerate your loaf in an airtight container or resealable plastic bag for up to 5 days. The cold slows down staling enzymes, but the crust will harden—reheat before serving to restore crispiness. I use glass Pyrex containers with tight-fitting lids to prevent moisture loss.

To reheat, wrap the loaf in foil and bake at 350°F for 10 minutes, or use the broiler for 2-3 minutes to crisp just the crust.

Freezer-Friendly

Freezing sourdough is a game-changer for meal prep. Wrap the cooled loaf tightly in plastic wrap followed by a foil layer, then place in a freezer bag to lock in freshness. It stays good for 3 months without quality loss.

To reheat, thaw overnight in the fridge, then warm in a 350°F oven for 10-15 minutes wrapped in foil. For quick use, toast slices straight from frozen—they’ll crisp up beautifully. 🧊

Reviving Stale Bread

Even if your sourdough loses its crispness, don't toss it! Preheat your oven to 350°F, wrap the loaf in foil, and bake for 10 minutes to restore moisture. For extra crispiness, finish with 2 minutes under the broiler.

Alternatively, slice and toast—this method works best for 24-hour-old bread. I also love making croutons or breadcrumbs from stale sourdough—just pulse in a food processor and store in the freezer for future use.

Starter Maintenance

Your sourdough starter deserves equal care. Store it in the fridge between bakes to slow fermentation—it’ll last 1-2 weeks without feeding. Before using, feed it 1:1:1 ratio (starter:flour:water) and let it ferment at room temp for 4-6 hours until bubbly.

For long-term storage, freeze portions in an ice cube tray—thaw and feed when ready to bake. A healthy starter is the foundation of great sourdough, so never skip the 24-hour activation before mixing your dough. 💡

Slicing Secrets

Use a serrated bread knife for clean cuts that showcase the open crumb. Dip the knife in hot water between slices to prevent sticking—this works especially well with crusty sourdough. For sandwiches, slice ½ inch thick to maintain structure.

Store slices in a paper bag at room temperature to prevent drying. Pro tip: If your bread develops a hard crust, lightly brush slices with olive oil before toasting for extra flavor and crispiness. ✨

Frequently asked questions