What Is Bulk Fermentation (Stockgare)? — Sourdough Basics

Clear, practical explanation of bulk fermentation (Stockgare) for beginner sourdough bakers — what it is, why it matters, how to judge it, and common mistakes.

What to Expect

This page explains bulk fermentation (Stockgare) in practical terms: what it is, why it matters for crumb and flavor, how to judge progress, and simple, repeatable ways to control it.

What you'll learn:

  • ✓ The biological purpose of bulk fermentation
  • ✓ Visual and tactile signs dough is ready
  • ✓ How time, temperature and starter strength interact

💭 You won't memorize exact minutes — you'll learn to read dough. Expect to rely on feel, visual cues and simple tests rather than clocks alone.

What You Need

Must have:

Active sourdough starter

Active and predictable — known doubling time after feeding

⚠️ Create a starter first → more

Kitchen scale

Accurate to the gram; required to control hydration and dough mass

⚠️ Buy one before measuring dough

Large mixing bowl

Enough volume for dough to expand during bulk

Alternative: Clear container useful to watch rise

Nice to have:

Why bulk fermentation matters:

Develops structure

During bulk, gluten strengthens and gas is trapped — this determines final crumb openness [1].

Builds flavor

Yeast and bacteria produce acids and aroma compounds during this stage, shaping taste more than later proofs [1].

Efficient timing

Concentrating fermentation into one bulk stage simplifies scheduling and reduces handling for beginners [2].

Controls oven spring

Correct bulk fermentation leaves enough elasticity for a strong oven spring; under- or over-fermented dough behaves poorly in the oven [2].

Ingredients

For: Concepts and simple dough examples (no full bake required)

Dough (any basic lean sourdough) Example: 450g flour, 290g water, 90g starter, 9g salt Use same dough to practice bulk fermentation signs
Time Variable Bulk length depends on temperature and starter activity

Step by Step

How to run and judge bulk fermentation (Stockgare)

1

Mix and autolyse (0–1 hr)

Mix then rest 20–60 min

Mix flour and water, rest to hydrate; then add starter and salt. Use your kitchen scale to keep hydration consistent.

✓ Dough cohesive and smooth after mixing
💡 Autolyse reduces required kneading and improves gluten development [1].
2

Start bulk (time 0)

When mixing finishes

Place dough in a lightly oiled large mixing bowl at rest temperature (room temp or 24°C/75°F as a reference).

✓ Note starting time and dough temperature with thermometer if available [1]
💡 Warmer dough = faster bulk; cooler dough = slower and more acid development [2].
3

Perform folds (every 20–40 min)

3–6 times over first 2–3 hours

Using a dough scraper or wet hand, perform gentle stretch-and-folds to strengthen the dough.

✓ Dough becomes smoother and more elastic after successive folds
💡 Folding frequency depends on dough strength — fewer folds for strong flours, more for weaker ones [1].
4

Watch the dough, not the clock

Variable

Look for these signs that bulk is nearing completion: about 20–50% volume increase, dough surface domed and glossy, many gas bubbles visible under the surface.

✓ Dough holds a gentle poke and springs back slowly — not fully snapback
💡 The 'poke test' and bubble visibility are more reliable than fixed hours because starter strength and temp vary [2].
5

When to stop bulk (ready to shape)

When structure is developed but dough still extensible

If under-fermented: dough tight, few bubbles, little spring. If over-fermented: excessive slackness, collapse, very sour aroma. Stop bulk when you have elasticity plus extensibility.

✓ Windowpane test shows an extensible but not brittle gluten sheet
💡 If unsure, chill the dough to slow fermentation and buy time before shaping [1]
6

Transfer and shape

Immediately after bulk

Turn dough out onto floured surface, shape gently and place in a proofing basket or loaf pan. Minimize degassing to preserve bubbles created during bulk.

✓ Tensioned surface and visible gas retention
💡 Good bulk reduces need for aggressive shaping later [2].
7

Adjusting future bulks

Based on outcome

If crumb is too dense, shorten bulk or increase folding to strengthen gluten; if too open and collapses, reduce proof time or starter quantity.

✓ Make one variable change at a time (temperature, starter amount, hydration)
💡 Record temperature, times, and starter state to learn patterns [1]

What If It Doesn't Work?

Common bulk fermentation mistakes and fixes:

Bulk finishes too quickly

Likely: Too warm or starter too vigorous

Fix: Cool dough (chill in refrigerator) or reduce starter amount; perform fewer folds

→ More info

Dough collapses during shaping

Likely: Over-fermented — structure weakened

Fix: Shorten bulk next time, handle gently, consider cold retard after shaping

→ More info

Dense crumb despite long bulk

Likely: Insufficient gluten development or too aggressive degassing

Fix: Add more or better-timed folds during bulk, minimize degassing when shaping

→ More info

Very sour bread

Likely: Excessive slow fermentation or too cool long bulk

Fix: Shorten bulk or raise temperature slightly; use a stronger starter feed schedule

→ More info

💪 Reading dough improves with practice. Keep notes and change only one variable at a time so you can learn cause and effect [1][2].

What now?

You want a practical bake to practice bulk
→ Try a simple loaf with a long cold bulk
You want deeper theory
→ Read about how yeast and bacteria interact during fermentation
You want to control flavor
→ Experiment with temperature and starter quantity
You want troubleshooting steps
→ See common troubleshooting guides

Sources

  1. [1]
    The Perfect Loaf – The Perfect Loaf – Link
  2. [2]
    Plötzblog – Plötzblog – Link