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Sourdough Starter Not Rising? Here's Why, and the Fix

A flat, quiet starter is the most common sourdough panic, and it is almost never dead. Nearly every stalled starter has one of three causes: it is young, it is cold, or it is hungry.

Cause 1: it's young (days 3 to 7)

New starters famously boom on day 2 or 3 and then go silent. That early rise comes from bacteria that fade before the true sourdough yeast establishes itself. The stall between roughly day 3 and day 7 is a phase, not a failure.

Fix: nothing fancy. Keep the daily discard-and-feed rhythm and keep it warm. Activity returns within a few days.

Cause 2: it's cold

Fermentation slows sharply below about 20°C (68°F). At 74–76°F (23–24°C) a healthy starter is dramatically livelier than the same jar on a cold countertop.

Fix: move the jar somewhere warm: on top of the fridge, near a router, or in the oven with just the light on. Warm (not hot) water for feeds helps too.

Cause 3: it's underfed

If the starter rises and collapses long before you feed again, or shows a layer of gray liquid (hooch), it is running out of food. An exhausted starter gets acidic, and acid slows the yeast further.

Fix: feed more, or more often. Move from 1:1:1 (starter:flour:water by weight) to 1:2:2 or even 1:5:5, or add a second daily feeding. A couple of days of generous meals usually restores the bounce.

Is it ever actually dead?

Almost never. Pink or orange streaks or fuzzy mold mean start over. Anything else, including weeks of neglect in the fridge, can be revived with a few warm, generous feedings.

Not sure which cause is yours?

Snap a photo in Sourdoughy and the AI reads rise, bubble structure, and hooch, then tells you which of the three causes it sees and exactly what to feed next.

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