Sourdough Bottom Burning: How to Stop It

Stop burnt sourdough bottoms by raising the pot off direct heat with a sheet pan below, baking on a higher rack, or reducing temperature after the covered phase.

Fixes ranked

1. Place a baking sheet on the rack under your Dutch oven as a heat shield.
2. Move the rack one level higher.
3. Bake the uncovered phase about 25°F lower.
4. Use parchment; avoid ultra-thin dark pans that scorch.

Why it happens

Home ovens often run hotter at the floor. Cast iron stores that heat and conducts it into the loaf base — great for spring, harsh without shielding.

Systematic debugging

When a loaf fails, resist the urge to change flour, hydration, schedule, and shaping all at once. Rank the suspects: starter strength, dough temperature, fermentation length, then shaping and bake setup. The same dense crumb has different fixes depending on whether the dough never rose or rose and collapsed.

What to log next bake

Write down starter peak time, dough temperature after mixing, bulk duration, final proof duration, and oven setup. One annotated failure teaches more than three untracked "meh" loaves. If two consecutive bakes share the same fault after one change, reverse that change and try the next suspect.

One thing to remember

If you only remember one number, remember dough temperature — it explains more "mystery" outcomes than flour brand lore.

First question to ask

Was the starter actually at peak? Many 'dough problems' are sleepy-preferment problems. If the jar was fed right before mixing, or taken cold from the fridge, fix that before rewriting your formula.

Oven vs fermentation

Burnt bottoms and pale tops are oven geometry. Dense crumbs and blowouts are fermentation. Don't buy a new Dutch oven to fix underproofing.

Field notes

In practice, bakers searching for guidance on sourdough bottom burning fix usually need a decision rule, not a lecture. Document one success in enough detail that you could hand the notes to a friend and they could reproduce it. If results swing wildly, stabilize feeding and room temperature for a week so you can see the signal again. Fix the earliest upstream fault; downstream symptoms often disappear on their own.

Also useful: weigh everything, preheat longer than you think, and cool fully before you judge crumb quality. Those three habits make every other tip more reliable.

Frequently asked questions

Ice under parchment?

Try the sheet-pan shield first; ice can complicate steam.

Enamel vs bare cast iron?

Both can scorch; shielding matters more than enamel.

Dark brown vs burnt?

Deep brown can be delicious; black and bitter is the problem.

Log rack position and temps in SourdoughAI when you crack the no-burn setup for your oven.