Sourdough Baking Temperature Guide (Everything You Need To Know and Every Step In Between)

Last updated on May 21st, 2026

Most sourdough problems trace back to temperature. A starter that won’t rise, a dough that ferments too fast, a loaf that comes out dense. Nine times out of ten, something was too warm or too cold at the wrong moment. The good news is that once you understand how temperature works at each stage, a lot of the guesswork disappears.

Table of Contents

• How Temperature Affects Sourdough (The Short Version)
• What is Sourdough Bread?
• Dough Temperature
• How to Bake Sourdough Bread
• Baking Sourdough Temperature is Easier to Understand Than You Think
• Baking Sourdough Temperature FAQs

How Temperature Affects Sourdough (The Short Version)

Sourdough is a living process. Bacteria and wild yeast are active throughout, from the moment your starter is fed to the moment the dough goes into the oven. And temperature is the dial that controls how fast or slow they work.

Here’s how it breaks down across the main stages:

Stage	What Temperature Controls
Starter & Levain	How quickly it becomes active and ready to use
Autolyse	Enzymatic activity in the flour
Final Dough Temperature	The pace of the entire fermentation from that point forward
Bulk Fermentation	Rise time and flavor development
Proofing	Dough strength and final structure
Baking	Oven spring, crust formation, and whether the loaf is fully cooked through

The target you’ll hear most often is 78°F for your final dough temperature (FDT). That’s the sweet spot where fermentation moves at a reliable pace — not so fast that the dough overproofs before you’re ready, not so slow that you’re waiting all day.

The one temperature you can easily control? The water. Everything else (the flour, the room, the levain) is mostly fixed. Adjusting your water temperature is the simplest way to hit your FDT target consistently, and it’s a habit that makes a noticeable difference once you start doing it.

What is Sourdough Bread?

Sourdough is made through natural fermentation, so no commercial yeast. It relies on wild yeasts and bacteria from the environment around you: the air, the grain, even the baker’s hands.

These microorganisms do two jobs. The bacteria produce organic acids (lactic and acetic) that create sourdough’s signature flavor and extend its shelf life. The wild yeasts produce carbon dioxide gas, which makes the dough rise.

Important Sourdough Terms

Term	What It Is	What It Does
Starter	A live mixture of flour and water that ferments naturally	The foundation of all sourdough, it’s kept alive by regular feedings
Levain	A portion of starter mixed with fresh flour and water	Introduces yeast and bacteria into the dough; made fresh for each bake
Autolyse	A rest period where flour and water are mixed before other ingredients are added	Improves the dough’s ability to stretch without tearing
Bulk Fermentation	The dough’s first rise	Develops flavor and lift
Proof	The dough’s second (final) rise after shaping	Strengthens dough structure before baking
Final Dough Temperature (FDT)	Temperature of the dough right after mixing	Controls fermentation speed; adjusted by changing water temperature

Dough Temperature

Temperature controls how fast fermentation happens. Cooler dough = slower fermentation. Warmer dough = faster fermentation. Most recipes target an FDT of 78°F.

The only ingredient temperature you can easily control is the water. Example calculation to hit 78°F:

Ingredient	Temperature
Levain	75°F
Flour	70°F
Room Temperature	75°F
Water (adjusted)	92°F
Final Dough Temperature	78°F

After mixing, check with an instant-read thermometer. Too high, use cooler water next time. Too low, use warmer water.

Target Temperatures at Each Stage

Stage	Temperature
Autolyse & Mix (FDT)	78°F
Bulk Fermentation (room temp)	74–76°F
Cold Proof (fridge)	~38°F
Oven Preheat	450°F
Internal Temp When Done	208°F

How to Bake Sourdough Bread

We know that the beginning of sourdough breads is through the magical starter, that contributes to the wonderful sour flavors in the bread.

Equipment

Before the starter however, there are a few tools required for baking artisan style bread.

This includes:

• Dutch oven with lid (must handle 500°F)
• Large mixing bowl
• 2 medium proofing bowls
• 2 kitchen towels to line the bowls
• Sharp knife for shaping
• Plastic bowl scraper
• Kitchen scale
• Instant-read thermometer
• Scoring blade (lame) to score sourdough bread
• White rice flour for dusting
• Parchment paper
• Pizza peel
• Oven mitts
• Fine grain sea salt

1. Prepare the Levain

Mix the following in a clean jar and leave at room temperature for 5–6 hours. It’s ready when it has expanded, is bubbly on the top and sides, and smells sour.

Ingredient	Amount	Baker’s %
Ripe Sourdough Starter	38g	50%
Whole Wheat Flour	38g	50%
Bread Flour	38g	50%
Water	76g	100%

Tip: Take your starter out of the fridge 3–12 hours before making the levain. Feed it with 100g each of flour and water first.

2. Autolyse

Mix flour and water with wet hands until no dry flour remains. The dough will look shaggy — that’s fine. Scrape down the sides, cover, and leave near the levain for 1 hour.

3. Mix

Check the dough temperature. Add salt, a splash of water, and the levain on top, then pinch everything together with wet hands until fully incorporated. Move to a container and check the temperature again.

4. Bulk Fermentation

At 74–76°F room temperature, this takes about 4 hours. Do 3 sets of stretch and folds, spaced 30 minutes apart.

How to stretch and fold:

1. Wet your hands
2. Grab one side of the dough and stretch it upward
3. Fold it over to the opposite side
4. Repeat on all 4 sides (north, south, east, west) — that’s one set
5. Cover and rest 30 minutes before the next set
6. After the third set, let the dough rest for the remainder of bulk fermentation

Bulk fermentation is done when: the dough has risen 20–50%, looks domed, and shows bubbles along the sides and top. If not, give it another 15 minutes.

5. Shape and Proof

Flour your surface, turn the dough out, and divide into 2 large or 4 small loaves. Shape each into a round by stretching and folding until the surface is taut.

Dust proofing baskets with rice flour, place loaves in seam-side up, cover, and proof at room temperature for 3–4 hours. Then transfer to the fridge for 12–15 hours.

The poke test: Press a fingertip into the dough. If it springs back immediately, it needs more time. If it springs back slowly, it’s ready.

6. Bake

1. Place an oven rack at the lowest position with no rack above it
2. Put the Dutch oven (with lid) on the rack
3. Preheat to 450°F for at least 30 minutes
4. Take a loaf from the fridge, flip onto parchment paper, and score with a blade at a 90-degree angle
5. Rub a little olive oil on the bottom of the Dutch oven
6. Slide the dough in on the parchment, put the lid on, and return to the oven
7. Bake covered for 20 minutes
8. Remove the lid and bake for another 30 minutes

Done when the internal temperature reads 208°F and the crust is deep golden brown.

Baking Temperature Reference

Stage	Temp	Time	Notes
Preheat (Dutch oven inside)	450°F	30+ min	Don’t rush — a hot Dutch oven is what gives the spring
Bake with lid on	450°F	20 min	Trapped steam helps the loaf rise
Bake with lid off	450°F	30 min	Develops color and crisps the crust
Internal temp (done)	208°F	—	Check with an instant-read thermometer

Baking Sourdough Temperature is Easier to Understand Than You Think

Sourdough has a reputation for being difficult, and temperature is a big reason why. It’s not something most baking recipes talk about openly, so when something goes wrong, it’s hard to know where to look.

But it’s also one of the easier things to get right once you know what you’re aiming for. A thermometer, a little math on your water temperature, and an eye on the clock at each stage…that’s most of it. The rest comes with practice.

If you work through this guide once from start to finish, you’ll have a much clearer picture of what’s happening inside your dough at every step. And that understanding is what makes the difference between following a recipe and actually knowing how to bake sourdough!

Baking Sourdough Temperature FAQs