18-Hour Bread Recipe: Slow-Rise Crust With Airy, Golden Crumb

An 18-hour bread recipe transforms simple flour and water into a loaf with a crackling crust and airy crumb—no shortcuts, just time and patience. This slow-rise method develops deep flavor and texture that store-bought bread can’t match. The key lies in proper fermentation, where yeast and gluten work their magic over hours, creating a structure that’s both sturdy and tender.

This recipe starts with an autolyse—a resting period that hydrates the flour before adding yeast—then progresses through bulk fermentation, shaping, and a final proof. Cold proofing overnight enhances flavor and makes scoring easier. By baking at high heat, you’ll achieve that coveted golden crust while keeping the interior light and open.

The result is a loaf with a crisp, caramelized exterior and an interior so tender it nearly dissolves on the tongue. Perfect for sandwiches, toast, or serving alongside soups, this bread is worth the wait. Every step builds toward that moment when you pull it from the oven, still steaming, and know you’ve made something extraordinary.

Whether you’re a beginner or an experienced baker, this method delivers consistent, professional-quality results. The long fermentation time ensures reliability, while the high heat bake guarantees that perfect crust. Let’s get started on creating bread that will impress even the most discerning eaters.

Ingredients for 18 hour bread

High-protein flour and precise hydration kick off this 18-hour journey to artisan bread perfection.

The bread flour is non-negotiable here—King Arthur or Caputo deliver the high-protein structure needed for that coveted open crumb. Bulk bins at Whole Foods or King Arthur’s website offer the best quality. For the yeast, always test it first: proof it in warm water with a pinch of sugar—if it doesn’t foam within 10 minutes, it’s dead. The honey acts as both sweetener and fermentation enhancer; local raw honey adds subtle floral notes that store-bought can’t match. Store your flour in an airtight container to prevent oxidation, which dulls flavor and weakens gluten development over time.

No bread flour? All-purpose flour plus 1 tbsp vital wheat gluten gets you 90% there. The olive oil can be swapped for melted coconut oil if you’re avoiding dairy, though it lacks the fruity depth. For the egg wash, aquafaba (chickpea brine) works beautifully for vegan versions—just whisk it until frothy. The cornmeal should be fine-ground (not coarse grits) to prevent tearing the dough during shaping. If your dough feels too sticky after the autolyse, add ice water 1 tbsp at a time—cold water strengthens gluten without over-hydrating.

Fermented dough keeps best in the fridge for up to 48 hours—the longer it rests, the more complex the flavor. Shape the dough into a boule or batard for classic French-style loaves, then place in a proofing basket lined with a floured towel. For scoring, use a razor blade or lame—a serrated knife leaves uneven cuts. Baked loaves cool on a wire rack for at least 2 hours before slicing; this prevents a gummy interior. Store wrapped in a clean kitchen towel at room temperature for 3-4 days, or freeze sliced loaves for up to 3 months in airtight bags.

Step-by-step instructions for slow-rise artisan bread

This method delivers a signature crust and open crumb through precise hydration and time.

In a large mixing bowl, combine the 5 cups bread flour and 3.25 cups water. Using a dough whisk or your hands, mix until no dry flour remains and the dough forms a shaggy mass. The goal here is to fully hydrate the flour while developing early gluten strands through mechanical manipulation.

Cover the bowl with plastic wrap or a damp kitchen towel and let rest for 30 minutes. This autolyse stage allows the flour to fully absorb the water and begins gluten formation without yeast activation. You’ll notice the dough becomes smoother and more cohesive during this time. This step is critical for achieving that signature open crumb structure we’re after.

After the autolyse, add the 0.25 tsp instant yeast, 2 tsp salt, and 1 tbsp honey to the dough. Using a dough scraper, fold these ingredients into the dough until fully incorporated. Then add the 0.5 cup olive oil and continue mixing until the oil is completely distributed throughout.

Begin developing the gluten by performing a series of stretch-and-folds every 30 minutes for 2 hours. For each set, wet your hands slightly, grab one side of the dough, stretch it upward, and fold it over itself. Rotate the bowl and repeat this process on all four sides. This technique strengthens the gluten network while evenly distributing the yeast. The dough should become increasingly elastic and smooth with each session.

After completing the stretch-and-folds, cover the dough loosely with plastic wrap and allow it to bulk ferment at room temperature (70-75°F) for 16 hours. I recommend using a proofing box or placing the dough in a warm oven with the light on to maintain consistent temperature. The dough should rise until it’s about 50-75% larger than its original size.

During this extended fermentation, the yeast will slowly develop complex flavors while creating the perfect gas bubbles for that open crumb structure. You’ll notice the dough becomes lighter and slightly jiggly when ready. For best results, perform a finger test by gently pressing your finger into the dough—it should spring back slowly rather than immediately.

Turn the dough onto a lightly floured surface and gently shape it into a round boule or batard. For a boule, use the “macaron” technique by pulling the dough toward you while rotating the bowl. For a batard, roll the dough into a log shape. Place the shaped dough seam-side down on a piece of parchment paper dusted with 0.25 cup cornmeal.

Cover loosely and refrigerate for 2 hours. This cold fermentation slows yeast activity while allowing flavors to develop further. The dough should rise slightly during this time but won’t double in size. This cold proof also helps create that signature crisp crust by firming up the dough structure.

Preheat your oven to 450°F with a Dutch oven inside for 45 minutes. This intense preheating is crucial for creating that signature crust. Remove the Dutch oven from the oven and carefully transfer the dough (still on its parchment) into the hot pot.

Bake covered for 20 minutes, then remove the lid and bake for an additional 20-25 minutes until the bread reaches an internal temperature of 205°F. Brush the crust with the prepared egg wash (1 whole egg beaten with 1 tsp water) and sprinkle generously with 0.5 tsp coarse sea salt. The bread is done when it has a deep golden color and sounds hollow when tapped on the bottom.

Remove the bread from the Dutch oven and transfer it to a wire rack. Let it cool completely for at least 1 hour before slicing. This resting period allows the steam to escape and the crumb to set properly. The bread should have a crisp, crackly crust that gives way to an open, airy crumb with visible holes.

For best results, store any leftovers wrapped in a bread bag at room temperature for up to 3 days. To revive stale bread, wrap it in foil and warm in a 350°F oven for 10-15 minutes until heated through. This bread is perfect for sandwiches, toast, or simply enjoying with butter and jam.

Pro cooking tips for this dish

Autolyse Mastery

The 30-minute autolyse is where gluten development begins in earnest. I can’t stress enough how critical this step is for that signature open crumb. Use a dough whisk or your hands to fully incorporate the flour and water—no dry bits allowed. The dough should look shaggy but cohesive. If it feels too sticky after mixing, add 1 tbsp ice water at a time until it becomes manageable. This stage hydrates the flour completely before yeast activation, setting you up for perfect gluten structure later. 🌾

Stretch-and-Fold Precision

Those stretch-and-folds every 30 minutes for 2 hours build gluten strength systematically. I like to do 4 sets total—after each set, the dough should feel smoother and more elastic. Wet your hands slightly to prevent sticking, then grab one side, stretch upward, and fold it over itself. Rotate the bowl and repeat on all sides. This technique creates a tight gluten network that traps gas during fermentation, giving you that professional bakery crumb. Don’t skip this step—it’s what transforms home baking into artisanal quality.

Temperature Control Secrets

Fermenting at 70-75°F is ideal, but most kitchens don’t maintain this consistently. I use a proofing box (a simple DIY with a heating pad and thermostat) or place the dough in an off oven with the light on—this creates a warm, stable environment. If your kitchen runs cooler, extend fermentation to 20 hours—the dough will still develop great flavor, just more slowly. Always check dough readiness with the finger test: press gently—it should spring back slowly rather than immediately.

Cold Proofing Advantages

The 2-hour cold proof before baking might seem counterintuitive, but it’s a game-changer. Chilling firms up the dough structure, making scoring easier and creating that crisp crust. I place my shaped dough in the fridge on a parchment-lined tray for even cooling. This step also allows flavors to meld further—you’ll notice deeper, more complex notes in the final bread. Pro tip: If you’re short on time, 1 hour in the fridge still works, but you may need to bake immediately after shaping.

Dutch Oven Preheating

That 45-minute preheat with the Dutch oven inside is non-negotiable for maximum crust development. I use a Lodge 5-quart because its heavy cast iron retains heat beautifully. The intense heat creates steam that builds that signature oven spring—your bread will rise dramatically in the first 10 minutes of baking. For even better results, add 1 cup of ice cubes to the bottom of the Dutch oven before baking—this creates extra steam for an ultra-crisp crust. 🔥

Scoring Like a Pro

Scoring isn’t just decorative—it directs where the bread expands. Use a sharp razor blade or lame (available at baking supply stores) for clean cuts. For a boule, make 3-4 diagonal cuts about ¼ inch deep—this prevents random bursting. If your dough feels too firm after cold proofing, let it sit at room temperature for 10-15 minutes before scoring. The cuts should be confident but not forceful—you’re guiding the oven spring, not tearing the dough. A little flour on your fingers helps prevent sticking during shaping and scoring.

Frequently asked questions