How long does Sourdough Starter last?
Sourdough Starter lasts 7–14 days in the fridge. Spoilage signs to check, storage tips, and cited food-safety sources.
Quick answer
Can I still eat it?
Use this as a conservative screen before you rely on the storage window. If anything seems unsafe, discard it.
Use whole days since it was opened, cooked, or bought.
Sealed / unopened: N/A
Signs Sourdough Starter has gone bad
- Pink or orange streaks.
- Fuzzy mold of any color.
- Putrid, rotting smell (not normal clean sour/yeasty tang or acetone when hungry).
Still good if
- A dark liquid layer (hooch) on top is just alcohol — pour it off or stir it back in.
- A sharp, sour, acetone-like smell means it's hungry, not dead — feed it.
Discard immediately if
- Any visible mold (pink, orange, green, black fuzzy growth) — discard the whole starter
- Pink or orange streaks or a putrid, rotting smell (not the normal clean sour/yeasty or acetone-hungry smell)
- Contamination you cannot remove (e.g. foreign mold throughout)
Why guidance varies
A healthy starter is a living culture; danger signs are colored streaks or true mold, not hooch or a sharp sour smell.
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Frequently asked questions
How long does Sourdough Starter last?
In the fridge: 7–14 days. Sealed / unopened: N/A. Refrigerate between feeds if you're not baking daily. A layer of liquid (hooch) on top is normal alcohol — pour off or stir in. Sharp sour or acetone smell usually means the starter is hungry — feed it. Only discard for true mold, pink/orange discoloration, or a putrid smell.
How can you tell if Sourdough Starter has gone bad?
Signs that Sourdough Starter has gone bad: Pink or orange streaks; Fuzzy mold of any color; Putrid, rotting smell (not normal clean sour/yeasty tang or acetone when hungry). Still good if: A dark liquid layer (hooch) on top is just alcohol — pour it off or stir it back in; A sharp, sour, acetone-like smell means it's hungry, not dead — feed it.
What does the date label on Sourdough Starter mean?
Sourdough Starter usually doesn't carry a printed date label — judge by storage time and the spoilage signs above.
Sources for this answer
- A USDA FSIS — Molds on Food — Discard moldy high-moisture foods; do not scrape mold from soft/porous products.
- A FDA — Are You Storing Food Safely? — Sensory discard for mold and abnormal spoilage.