Why Your Sourdough Has a Burnt Bottom (And How to Fix It)

A burnt bottom on an otherwise great-looking loaf is one of the most frustrating sourdough outcomes. The top is gorgeous, the ear is tall, and then you flip it over and find black char. Here's what causes it and what to do.

The five main causes

1. Oven hot spot

Many home ovens have hot spots, especially on the bottom. The bottom heating element runs more than the top, and bread sitting directly above it gets cooked aggressively.

Fix: Move your Dutch oven or stone to the middle rack instead of the bottom.

2. Dutch oven too thin

Cheap or thin Dutch ovens transmit heat unevenly. The bottom of the dough sits directly on hot metal with no buffer.

Fix:

• Place a sheet pan on the rack below the Dutch oven (deflects heat)
• Or use parchment with extra layers
• Or upgrade to a heavier Dutch oven

3. Oven temperature too high

Your oven thermostat might be lying. A "475°F" oven might actually be 525°F.

Fix:

• Get an oven thermometer ($10)
• Adjust your set temp accordingly
• Try baking 25°F lower than the recipe says

4. Bake time too long

If your top is perfect at 30 minutes but you're baking 45 minutes, the bottom keeps cooking long after the top is done.

Fix:

• Pull the loaf earlier
• Verify with internal temperature (207–210°F is done)
• Don't rely solely on appearance

5. Direct heat without insulation

Baking directly on a baking steel or stone without a Dutch oven exposes the bottom to maximum heat from the start.

Fix:

• Add a layer of parchment paper
• Place on a sheet pan that's been preheated above the stone
• Reduce oven temp by 25°F

A diagnostic method

Bake a loaf with these adjustments and see what happens:

• Oven thermometer in place
• Middle rack instead of bottom
• Sheet pan on the rack below
• Parchment between dough and pan
• Pull at internal temp 207°F

If the bottom is still burnt with all four fixes in place, the issue is your specific oven and you may need to bake even cooler (425°F instead of 475°F).

Saving a burnt-bottom loaf

If it's already happened:

• Slice off the burnt bottom layer
• The rest is fine
• Use the burnt bottom for breadcrumbs (in food processor) — burnt bread crumbs add depth to many dishes
• Or compost

It's not a failure. It's a partial failure. You still have bread.

Color goals

A perfectly baked loaf bottom should be:

• Deeply browned, not pale
• Darker than the top (slightly)
• No black charring
• Crisp and dry

A pale bottom = under-baked.

A black bottom = burnt.

A deep brown bottom = perfect.

The Dutch oven reality

Most cast iron Dutch ovens conduct heat aggressively. Without a buffer, the bottom of the loaf sits directly against very hot metal. Some specific approaches help:

• Lodge cast iron (cheaper, rougher) — needs a parchment buffer
• Le Creuset (enameled, smoother) — slightly less aggressive but still benefits from parchment
• Combo cooker (Lodge) — very aggressive bottom heat, definitely needs parchment

The parchment paper hack

A double layer of parchment under the dough gives a meaningful buffer:

• Cut two parchment circles to the size of your Dutch oven
• Stack them
• Place the dough on top
• Use the parchment to lift the dough into the hot pot

This alone often solves a burnt-bottom problem.

Multi-tier baking

For maximum protection:

• Place a sheet pan on the lower rack
• Place your Dutch oven on the middle rack
• The sheet pan absorbs and reflects bottom heat

This is the most reliable fix for stubbornly burnt bottoms.

Lower temperature, longer bake

Some bakers prefer to bake at lower temperatures (425°F instead of 475°F):

• Bake 25 minutes covered
• Bake 25 minutes uncovered

The total time is similar but the heat is gentler. The bread spring is slightly less dramatic but the bottom doesn't burn.

When the recipe is wrong

Some popular recipes call for 500°F bakes. This is too hot for most home ovens, especially with thin Dutch ovens.

If a recipe consistently gives you burnt bottoms, the recipe was tuned for a different oven. Adjust down by 25°F and trust your eyes.

The internal temperature truth

Bread is done when its internal temperature reaches 207–210°F. Not before, not after.

A probe thermometer eliminates the guessing. Stick it into the side of the loaf, read the temp. Don't keep baking past 210°F just because the top doesn't look done — the bottom will keep cooking.

A simple test

For your next bake:

• Set oven to 25°F lower than the recipe
• Use middle rack
• Use parchment under the dough
• Pull at internal temp 207°F

If the bottom is still burnt, your oven runs even hotter than you think. Try 425°F instead of 450°F.

Most burnt-bottom problems are solved with these changes.

The good news

A burnt bottom is one of the easier sourdough problems to fix. It's almost always about heat management, not dough or technique. Once you find your oven's sweet spot, the issue disappears permanently.