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Bulk Fermentation Timer
Estimate your bulk fermentation time based on your kitchen temperature, starter strength, and flour type. Start the timer and get stretch & fold reminders.
1. Room Temperature
72°F
65°F85°F
2. Starter Strength
3. Flour Type
Estimated Bulk Fermentation
4h – 5h 30m
estimated total time
What to Look For
↑↑
50–75% volume increase
〰
Jiggly, airy texture when shaken
◡
Domed top surface with bubbles
Timer
00:00:00
🏄 Stretch & Fold Schedule
Perform a set of stretch & folds every 30 minutes for the first 2 hours, then leave the dough undisturbed.
1
Fold #1 at 30 min
Wet hands. Stretch each side up and over.
2
Fold #2 at 60 min
Dough should feel slightly stronger now.
3
Fold #3 at 90 min
Building tension. Gentle stretches.
4
Fold #4 at 120 min
Last fold. Let the dough rest after this.
💡 Temperature Tip
At 72°F, expect a longer bulk of 4h–5h 30m. Be patient—the flavor will be worth it.
Frequently Asked Questions
How do I know when bulk fermentation is done?
Look for a 50-75 percent increase in volume, a domed top surface with visible bubbles, and a jiggly, airy texture when you gently shake the container. Trust visual cues over the clock.
Does room temperature really affect fermentation time?
Yes, significantly. A kitchen at 80 degrees Fahrenheit can cut fermentation time in half compared to 68 degrees. Even a few degrees make a noticeable difference in timing.
How many stretch and folds should I do during bulk fermentation?
Most recipes call for 4 sets of stretch and folds, one every 30 minutes during the first 2 hours. After that, leave the dough undisturbed for the remainder of the bulk.
Can I do bulk fermentation in the fridge overnight?
You can, but most bakers prefer to cold-retard during the final proof, not during bulk. If you do cold bulk, expect 8-12 hours in the fridge and bring the dough to room temperature before shaping.
What happens if I over-ferment my sourdough?
Over-fermented dough becomes slack, sticky, and difficult to shape. The bread may turn out flat with a gummy interior and overly sour flavor. If in doubt, end bulk early rather than late.