Sourdough Starter Rises Quickly Then Collapses — Causes & Schedule Fixes
You have a strong, vigorous starter — too strong for your current feeding ratio. The fix is more food, not more time.
Your starter rises beautifully — sometimes triples — and then collapses within an hour or two. You miss peak constantly because the window is too short.
What it looks like
- Doubles or triples within 3–4 hours of feeding
- Peak window of less than an hour before falling
- Visible deflation when you check 4–5 hours after feeding
- Hooch may appear shortly after
Why this happens
Warm kitchen + small ratio
At 78–82°F, a 1:1:1 or 1:2:2 starter can finish in three hours. You're catching the rocket on the way down.
Mature culture
Older, well-established starters ferment faster than young ones. As your culture strengthens, your old feeding ratio stops keeping up.
Too much starter in the feeding
1:1:1 means you have as much old starter as fresh food. The yeast finishes the meal quickly.
How to fix it
Increase the feeding ratio to 1:5:5 or 1:10:10
More fresh food per unit of starter extends the time-to-peak. 1:5:5 typically peaks at 6–8 hours in a warm kitchen; 1:10:10 at 10–12. Both give you a longer window.
Move it somewhere cooler
Top of the fridge often runs 65–70°F. A pantry cabinet can be cooler too. A few degrees difference doubles or halves the peak time.
Time your bake to peak
Calculate backward: peak is when you want to mix the levain. Feed 6–8 hours before that with a 1:5:5 ratio for a predictable window.
Preventing it next time
- Pick one ratio and stick to it so you can predict peak time.
- Track your kitchen temperature — even a 3°F shift changes timing.
- Use the same flour every time. New flour = new fermentation profile.
Most starter problems show up in the data.
Sarah's Sourdough — the iOS app — logs every feeding, photographs every rise, and predicts peak by your kitchen temperature. Problems become visible weeks earlier.
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Related problems
Smells like nail polish remover
Your starter is starving. Acetone is what active yeast produces when it's eaten everything in the jar and started consuming itself.
Liquid layer on top (hooch)
Hooch is alcohol. Yeast has metabolized all the available sugars in the flour and produced alcohol as a byproduct. Your starter is hungry, not dying.