Timing
Sourdough Bulk Fermentation Timing: Room Temperature Matters
8 min read
The Bulk Fermentation Stage
Bulk fermentation is the period after mixing where your dough develops flavor and structure through extended fermentation. Getting it right is the difference between an airy, flavorful loaf and a flat, gummy brick.
The Formula
Base bulk time: 4–6 hours at 75°F (24°C) with 20% starter.
Adjust up 30 minutes for every 5°F decrease, or down 30 minutes for every 5°F increase.
Signs Your Bulk is Ready
- Dough is puffy and has increased 50–75% in volume.
- Poke test: a gently pressed fingertip leaves a dent that slowly fills partway.
- Dough jiggles slightly when the bowl is nudged.
- Visible bubbles on the surface and sides.
- Pleasant fermentation smell — mildly sour, not alcoholic.
Use our calculator’s temperature input to get a personalized bulk fermentation time estimate based on your actual kitchen conditions.