America's Test Kitchen Sourdough Bread Recipe: No-Knead Crust That Stays Fresh for Days

America's Test Kitchen sourdough bread recipe delivers that iconic tangy flavor and airy crumb without the guesswork. 💛 After years of perfecting this method, we've cracked the code for a foolproof no-knead approach that yields a crispy crust and tender interior.

The secret lies in precise fermentation times and oven steam techniques that transform simple ingredients into restaurant-quality bread.

What sets this recipe apart is its reliability—no more dense loaves or underproofed dough. We'll guide you through maintaining your starter, shaping the dough with confidence, and baking with steam to achieve that perfect golden crust. The result? Bread that stays fresh for days and rivals your favorite artisanal bakery.

This method simplifies the process without sacrificing quality. With just five ingredients and 24 hours of hands-off time, you'll end up with a loaf that's crisp on the outside, soft and open on the inside, and packed with that signature sourdough tang.

The crust develops a satisfying crunch while maintaining structural integrity for days.

Whether you're a first-time baker or a seasoned pro, this recipe builds confidence. We'll include troubleshooting tips for common issues like uneven browning or gummy crumb, ensuring your first attempt is successful. Let's get started on creating bread that will impress even the most discerning sourdough enthusiasts.

Ingredients for america's test kitchen sourdough bread

Five simple ingredients transform into a perfect no-knead sourdough loaf with crispy crust and airy crumb.

The sourdough starter is your secret weapon—it should be bubbly and active (like a jiggly Jell-O) when you use it. King Arthur or Bob's Red Mill flours work best for that signature open crumb. Water temperature matters: too cold slows fermentation, too warm overproofs. Room temperature (70-75°F) is ideal. If your starter isn't ready, feed it 1:1:1 (flour:water:starter) 8-12 hours before baking. For the flour, avoid whole wheat—it can make the crust too dense.

No sourdough starter? Store-bought active dry yeast works in a pinch (1 tsp), but the flavor won't be the same. Short on ice? Freeze water in a tray for instant cubes. The salt is non-negotiable—it regulates yeast and enhances flavor. Diamond Crystal is less salty than Morton, so adjust if using table salt. For a lighter loaf, add 1 tsp vital wheat gluten to the flour. And if you're baking in a dry climate, spray the oven floor with water before baking for extra steam.

This dough needs 24 hours of hands-off time, so plan ahead. Store it in a covered bowl at room temperature—the fridge slows fermentation too much. For best results, bake within 4 hours of shaping. The crust stays crisp for 2-3 days if wrapped in a clean kitchen towel. For longer storage, freeze the whole loaf—up to 3 months. To reheat, wrap in foil and warm at 350°F for 10 minutes.

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

Here's the foolproof method for achieving a crispy crust and airy crumb every time.

In a large mixing bowl, combine the 0.5 cup Active Sourdough Starter with the 1.5 cups Water at room temperature. Stir gently until fully incorporated—this activates your starter and creates the foundation for fermentation. The mixture should look slightly bubbly and homogeneous.

Next, add the 3.5 cups All-Purpose Flour and 0.75 tsp Kosher Salt to the bowl. Using a wooden spoon or your hands, mix vigorously for 3-4 minutes until a shaggy dough forms. You'll notice the dough will be sticky and wet at first—this is normal. The goal is to develop gluten without overworking the dough, so resist the urge to knead.

Here's the thing—this dough needs to be just the right consistency. It should be tacky but not soupy, and it should cling slightly to your fingers. If it feels too dry, add 1 tablespoon of water at a time until it reaches the ideal texture. This dough is designed to be no-knead, so we're relying on time and fermentation to develop structure rather than manual effort.

Transfer the dough to a clean, lightly oiled bowl and cover it tightly with plastic wrap. Place the bowl in the freezer and add the 0.5 cup Ice Cubes around the dough—this chilling step is crucial for controlling fermentation and developing flavor. The ice will help lower the dough's temperature rapidly, which slows yeast activity and creates a more controlled rise.

Let the dough chill for 12-18 hours in the freezer. During this time, the dough will develop a thick skin and increase slightly in volume. You'll know it's ready when the dough has nearly doubled in size and feels springy when pressed gently. The cold environment helps create a more open crumb structure and enhances flavor development.

I know it seems counterintuitive to use a freezer for bread, but this method prevents overproofing and gives you more control over the final texture. The cold also helps create that signature crispy crust we're after—it's all about the contrast between the cold dough and hot oven.

Remove the dough from the freezer and let it sit at room temperature for 15-20 minutes to soften slightly. This makes it easier to handle without tearing. Line a baking sheet with parchment paper and dust it lightly with flour. Transfer the dough to the prepared sheet and shape it into a round loaf by gently pulling the edges toward the center.

Preheat your oven to 450°F with a Dutch oven inside for 30 minutes. This step is critical—using a Dutch oven creates steam that gives you that professional bakery crust. While the oven preheats, lightly score the top of the dough with a razor blade or sharp knife, making a shallow cross about ¼ inch deep. This helps control expansion and creates a beautiful pattern.

Here's where it gets fun—the steam from the Dutch oven will create that signature crispy crust while keeping the interior moist. The scoring also prevents the dough from bursting open in unpredictable ways, giving you a more controlled rise and professional-looking loaf.

Carefully transfer the shaped dough (with parchment paper) to the preheated Dutch oven. Bake uncovered for 30 minutes, then remove the lid and continue baking for another 15-20 minutes until the crust is deep golden brown and the internal temperature reaches 205-210°F. You'll know it's done when the crust sounds hollow when tapped and the bread pulls away slightly from the sides.

Don't walk away during this final stage. The bread can go from perfect to overbaked quickly, especially in the last 5 minutes. Watch for the crust to develop that beautiful mahogany color—this indicates proper baking. The steam from the initial baking creates that crispy exterior while the uncovered finish helps set the crust properly.

If you're worried about the bread cooling too quickly, tent it loosely with aluminum foil for 5 minutes after removing from the oven. This helps maintain moisture while it cools. Let it cool completely on a wire rack before slicing—this prevents the crumb from becoming gummy.

Pro cooking tips for america's test kitchen sourdough bread

Starter Readiness Test

Before mixing your dough, perform the float test on your starter: drop a small spoonful into a glass of water. If it floats within 5-10 seconds, it's ready—this means it's active with enough gas bubbles.

I use a King Arthur brand starter that always passes this test after 8-12 hours of feeding. If it sinks, feed it 1:1:1 (flour:water:starter) and wait another 4-6 hours before attempting your bread. 💡

Dough Consistency Check

The dough should feel like "wet hair" when you press your finger into it—it sticks slightly but springs back. If it feels too stiff, add 1 tablespoon water at a time until it reaches the right texture.

I've ruined loaves by overcorrecting, so start with just ½ tablespoon and adjust gradually. The ideal dough will cling to the sides of your bowl when you lift it.

Freezer Hack for Control

Place your dough bowl directly on a bed of ice cubes in the freezer for the 12-18 hour chill. This creates a more stable fermentation environment than the fridge, which can cause temperature fluctuations.

I wrap my bowl in a damp kitchen towel first to prevent drying. The ice helps maintain a consistent 38-40°F temperature, crucial for even rise and flavor development.

Scoring Secrets

Use a single-edge razor blade (like Feather Safety Razor) for clean scoring. Press firmly but don't cut too deep—aim for ¼ inch cuts. The blade should go through the crust but not into the dough below.

I make a shallow cross (about ½ inch deep) on the top center. This prevents uneven expansion and creates that bakery-style crust pattern. 🔪

Steam Generation Tips

For maximum steam during baking, place a small metal bowl of boiling water on the oven rack below your Dutch oven. Alternatively, spray the oven walls with water before baking. I also recommend using Lodge cast iron Dutch ovens—they retain heat better than ceramic versions.

The steam should create that signature crispy crust while keeping the interior moist and open.

Crust Color Guide

Watch for a deep golden brown to mahogany color on the crust—this indicates proper baking. The crust should be crisp but not burnt. If it's browning too quickly, tent with foil for the last 5 minutes.

I use a thermometer probe to check internal temperature at 205-210°F. The bread is done when it pulls away slightly from the Dutch oven sides and sounds hollow when tapped. 🌟

Frequently asked questions