How long does Sourdough Starter last?
How long does Sourdough Starter last? fridge 7–14 days. Plus spoilage signs, sources, and an unopened-vs-opened note.
Quick answer
Sealed / unopened: N/A
Signs Sourdough Starter has gone bad
- Pink or orange streaks.
- Fuzzy mold.
- Putrid, rotting smell (not the normal clean, yeasty tang).
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 (discard the whole item, don't cut around it)
- Sour or off smell
- Slimy or sticky surface
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.
Get a heads-up before it expires. Search the full database instead.
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.
How can you tell if Sourdough Starter has gone bad?
Signs that Sourdough Starter has gone bad: Pink or orange streaks; Fuzzy mold; Putrid, rotting smell (not the normal clean, yeasty tang). 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 FoodKeeper — Storage windows and refrigeration guidance for this category.
- A USDA FSIS — Leftovers and Food Safety — Storage windows and refrigeration guidance for this category.