How To Bake a Sourdough Loaf | Crust, Crumb, Oven Spring

A great sourdough loaf starts with ripe starter, steady fermentation, and a hot bake that sets the center near 205°F.

If you’re learning how to bake a sourdough loaf, the job is simple on paper: mix flour, water, salt, and starter, then build strength, shape, proof, and bake hot. In practice, the loaf tells you what it needs. That shift matters. Sourdough gets easier once you stop chasing the clock and start reading the dough.

A good bake is not just a dark crust. You want a loaf that rises with intent, opens where you scored it, feels light for its size, and cools without a gummy center. Get those pieces lined up, and even a plain flour-and-water dough tastes rich and full.

What A Good Sourdough Bake Looks Like

A well-baked sourdough loaf has three things working together: a lively starter, enough dough strength to trap gas, and enough heat to drive strong oven spring before the crust hardens. Miss one of those, and the loaf still bakes, yet it will often spread, tear, or stay tight inside.

When the loaf is on track, you’ll notice a few clear signs:

• The starter doubles or nearly doubles after feeding and smells clean, tangy, and a little sweet.
• The dough smooths out after folds and gains bounce.
• Bulk fermentation leaves the dough puffier, lighter, and lined with bubbles near the bowl edge.
• The shaped loaf holds tension instead of flattening at once.
• The baked loaf sings and crackles as it cools.

That last part is easy to miss. Cooling is part of the bake. A loaf cut too soon traps steam in the crumb, and the center can turn tacky even if the crust looks done.

How To Bake a Sourdough Loaf At Home

Gather Ingredients And Tools

Start with bread flour or strong all-purpose flour, water, salt, and active starter. A Dutch oven makes the early part of the bake much easier because it traps steam around the loaf. A banneton is nice, though a towel-lined bowl works well too.

• 500 g flour
• 350 to 375 g water
• 100 g ripe starter
• 10 g salt
• Dutch oven or baking stone
• Bench scraper, lame or sharp blade, and kitchen scale

A scale is worth using. The King Arthur ingredient weight chart lists 1 cup of all-purpose flour at 120 grams, which is a good reminder that scoops vary more than most bakers expect. If you want a second formula to compare with your own, the WSU Breadlab rustic sourdough loaf uses the same core rhythm with a whole-grain slant.

Mix The Dough And Build Strength

Mix the flour and most of the water first, then let the dough sit for 20 to 40 minutes. That short rest gives the flour time to drink in the water. Next, add the starter, salt, and the last splash of water if the dough can take it. Squeeze and fold until no dry bits remain.

You do not need a long machine mix. Four rounds of stretch-and-folds or coil folds during the first two hours usually do the trick. After each round, the dough should feel tighter and cleaner. By the last fold, it should lift as one mass instead of tearing into loose strands.

Read The Dough, Not The Clock

Bulk fermentation is where many sourdough loaves drift off course. A cold kitchen slows the dough. A warm kitchen speeds it up. That means a recipe time can only get you in the ballpark. Watch the dough for a rise of about 30% to 50%, a domed surface, and bubbles along the sides or top.

If the dough looks flat and sleepy, give it more time. If it feels weak, airy, and close to collapse, shape it at once. Sourdough rewards restraint. You want enough rise to build flavor and gas, not so much that the loaf runs out of strength before it reaches the oven.

Stage	What You’re Watching	Useful Range
Starter after feeding	Dome, bubbles, clean tangy smell	4 to 8 hours
Autolyse rest	Shaggy dough turns smoother	20 to 40 minutes
First fold	Dough feels slack and sticky	30 minutes after mixing
Middle folds	More tension, less tearing	2 to 3 rounds, 30 minutes apart
End of bulk	30% to 50% rise, bubbles visible	3 to 6 hours
Bench rest	Surface relaxes after preshape	15 to 25 minutes
Final proof	Slow spring back when poked	1 to 3 hours warm, or overnight cold
Final bake	Deep color and firm center	20 minutes covered, 20 to 25 uncovered

Shape, Score, And Bake For Better Oven Spring

Shape With Surface Tension

Turn the dough onto a lightly floured counter and preshape it into a loose round. Let it rest, then do the final shape with intent. Pull the outer skin tight without ripping it. That outer tension gives the loaf direction in the oven. Weak shaping leads to a wide loaf with less height.

For the final proof, use the finger-poke test as a rough check. If the dent springs back at once, the loaf is still young. If it leaves a deep mark and stays there, it may be past its peak. The sweet spot is a slow return with a faint trace left behind.

Bake With Steam First, Dry Heat Last

Preheat the Dutch oven for a full 30 to 45 minutes so the loaf meets hard heat right away. Turn the dough onto parchment, score one firm slash, and load it fast. A covered bake traps steam, which keeps the crust flexible during the first rise. After that, uncover the pot so the loaf can brown and dry out.

A common pattern is 20 minutes covered, then 20 to 25 minutes uncovered at 450°F to 475°F. Color matters here. Pale sourdough often tastes flat. Push the bake until the crust is chestnut to deep brown. For doneness, King Arthur’s bread doneness notes point bakers toward internal temperature as one reliable check; many hearth loaves finish well around 205°F.

Three small habits sharpen the final result:

• Dust off excess flour before loading so the crust colors evenly.
• Score at a shallow angle if you want an ear.
• Cool the loaf on a rack for at least one hour before slicing.

Common Sourdough Loaf Problems And Fixes

Most sourdough trouble comes from one of four places: weak starter, short bulk, long bulk, or a timid bake. The loaf gives clues after every step. Once you tie those clues to one clear fix, progress comes fast.

Problem	Likely Cause	Fix For The Next Bake
Loaf spreads wide	Short bulk or weak shaping	Let bulk run longer and tighten final shape
Dense crumb	Starter not ripe or dough underproofed	Feed earlier and wait for fuller rise before shaping
Gummy center	Underbaked or sliced hot	Bake darker and cool longer before cutting
Flat score line	Low steam or weak dough skin	Preheat longer and build more surface tension
Sharp sourness	Overproofing or long warm fermentation	Shorten bulk or use a cooler dough temperature
Blowout on the side	Score too shallow or proof too short	Make one deeper slash and proof a bit longer

Your Next Loaf Will Get Better If You Track These Notes

Sourdough turns from guesswork into repeatable baking when you write down a few details after each loaf. You do not need a long baking journal. A scrap of paper works fine.

• Room temperature and dough temperature
• How long the starter took to peak
• How much the dough rose during bulk
• How the shaped loaf felt before baking
• Bake time, covered and uncovered
• Crust color, crumb texture, and flavor after cooling

Those notes let you spot patterns fast. If every loaf is dense, the answer is often earlier in the process than you think. If every loaf is dark outside and sticky inside, the fix is usually a longer final bake and a longer cool. Sourdough can seem moody, yet it follows its own logic once you start paying attention to the same few markers each time.

That is the real trick to baking a fine loaf at home. Not magic. Not luck. Just ripe starter, a dough that has fermented far enough, a shape with tension, and an oven hot enough to finish the job with conviction.