Sourdough Baguettes at Home: A Step-by-Step Guide

Why the Baguette Exposes Every Weakness

A baguette has almost nowhere to hide. The long, thin shape gives it a high crust-to-crumb ratio, so a slack score, a lazy shaping roll, or a weak oven spring shows on the finished loaf immediately. Sourdough adds a timing dimension on top of that: the dough has to be fermented to exactly the right point, because an over-fermented batter will not hold the elongated shape and an under-fermented one stays tight and dense. Getting a baguette right is less about a secret ingredient and more about reading the dough at each stage.

The target here is a thin, crackly crust and an open, irregular crumb full of glossy holes. Two variables do most of that work: hydration and steam. At 75 percent hydration the crumb has enough water to gelatinize into a translucent, holey interior, and a burst of steam in the first ten minutes keeps the surface soft long enough to spring before it sets into a shell. If you want to run the dough wetter or drier, put the numbers through the hydration calculator first, since even a 3 percent swing changes how the dough handles on the bench.

The Formula (Baker's Percentages)

This formula makes three baguettes of about 300 g each. Weights are set against total flour, the standard baker's percentage convention. Counting the water in the starter, true dough hydration lands near 76 percent, which is wet enough for an open crumb but still shapeable by hand with practice.

A starter dose of 15 to 20 percent keeps fermentation slow enough to time the shaping window, which is why this sits at 18 percent rather than the 25 to 30 percent a faster loaf might use. Salt holds at the standard 2 percent, tightening the gluten just enough to help the thin loaf keep its shape without going tough. Use a bread flour at 12 to 13 percent protein; a weaker all-purpose flour at 10 to 11 percent will feel soupy at 75 percent hydration and spread rather than hold a taper.

Mixing and Bulk Fermentation

Autolyse the flour and 375 g water for 30 to 60 minutes, holding back the starter and salt. This rest hydrates the flour and lets the gluten begin organizing on its own, so less mechanical work is needed later. Then add the starter and salt, pinching and folding until fully combined. Develop the gluten with 4 to 5 sets of stretch and folds spaced 30 minutes apart during the first 2 hours.

Bulk ferment for 4 to 5 hours at 24 to 26°C (75 to 78°F) until the dough has risen 50 to 60 percent and feels alive and jiggly with bubbles at the edges. Do not chase a full double. Slightly under-fermented dough shapes into baguettes far more easily and rewards you with stronger oven spring. Temperature sets the pace, so a cool 20°C (68°F) kitchen pushes the window past 5 hours; track the temperature with a bulk ferment timer rather than watching the clock alone.

Pre-Shaping and Final Shaping

Divide the dough into three pieces of about 320 g each. Pre-shape each into a loose rectangle or short cylinder without degassing hard, then rest them covered for 20 to 30 minutes so the gluten relaxes and the dough becomes extensible enough to elongate. Skipping this bench rest is the fastest way to fight a dough that snaps back and refuses to lengthen.

For the final shape, lay a piece seam-side up, fold the top third down to the center, and press to seal. Fold the bottom third up and seal along the seam with the heel of your hand, creating surface tension along the length. Then roll the log outward from the center with both hands, easing it into an even taper about 35 to 40 cm (14 to 16 inches) long. Keep the ends slightly pointed and the middle uniform.

Proofing on the Couche

Place the shaped baguettes seam-side up on a well-floured couche, pleating the cloth into supporting folds between each one so they proof upward instead of spreading flat. Cover and proof 45 to 75 minutes at 24°C (75°F). This is a deliberately short final proof: the loaves should look puffed but still firm, holding a slow-springing dent when poked. An over-proofed baguette collapses when scored and loses its spring in the oven.

While they proof, get the oven fully preheated. A baking steel or stone needs at least 45 to 60 minutes at full heat to store enough energy for the fast, fierce bake a baguette wants. Cold surfaces give pale, spring-less loaves.

Scoring and Baking with Steam

Transfer the proofed baguettes onto a floured peel or an inverted tray using a flip board, seam-side now down. Score each with 4 to 5 overlapping cuts running nearly straight down the length, each cut set at a shallow 20 to 30 degree angle to the surface and overlapping the previous by about a third. That near-parallel blade angle is what lifts the classic ear along each cut.

Bake at 250°C (480°F) on the preheated steel with heavy steam for the first 10 minutes, using a pan of boiling water on a lower rack or a few ice cubes in a preheated tray. Steam keeps the crust supple so the loaf can spring open along the scores. Remove the steam source and bake a further 10 to 15 minutes until deep golden and hard-shelled. Internal temperature should reach 96°C (205°F). The total bake runs 20 to 25 minutes; a hot, short bake is what produces a thin, crackling crust rather than a thick, leathery one.

Reading the Finished Loaf

A good baguette crackles audibly as it cools, the crust splitting into fine fissures, and the scored ears stand crisp and raised. Cut it open and you should see an open, irregular crumb with a translucent, glossy interior, the sign that a 75 percent dough was fermented and baked well. A tight, even crumb points to under-fermentation or a dough shaped too tightly; a flat loaf with no ears means it was over-proofed or scored too deep and slack.

Baguettes are best within a few hours of baking, when the crust is at its crispest. To revive a day-old loaf, sprinkle it with water and bake at 200°C (400°F) for 4 to 5 minutes to re-crisp the shell.

Troubleshooting

Change one variable at a time and note it: bulk temperature, proof length, steam method, oven position. Within a few bakes you will have baguettes dialed in to your kitchen, with a thin crackling crust, raised ears, and an open, glossy crumb that shows off the work.