Is My Sourdough Starter Dead? A Beginner's Troubleshooting Guide

If you're here because your starter looks weird, smells weird, or has stopped doing anything at all, take a breath. It's almost certainly fine. Sourdough starters look alarming on a regular basis, and the vast majority of "I think I killed it" moments are a hungry starter, a cold kitchen, or a young one that just needs more time. Here's how to tell what's actually going on.

First, the one real emergency

There is exactly one thing that means "throw it out and start over": pink or orange streaks, or fuzzy mold. That's harmful growth, and it's the only situation where you don't try to rescue it. If you don't see that, keep reading, because everything else on this list is fixable.

Grey liquid on top

That's called hooch, and it's alcohol the yeast produced when they ran out of food. It looks awful and it scared me half to death the first time. It's completely harmless. Pour it off (or stir it in for a more sour flavor) and feed your starter. Hooch just means "I'm hungry, feed me sooner."

A sharp, nail-polish-remover smell

Same message, different signal. That acetone smell is the same hunger talking. Feed it and it'll settle within a feeding or two. A happy, recently-fed starter smells sweet and yeasty, a little like beer. A hungry one gets sharp. Neither is broken.

It's not rising at all

This is the big one, and it's almost never death. It's one of three things:

• Too cold. Under about 70°F a starter slows way down. Move it somewhere warmer, the top of the fridge or an oven with just the light on, and watch it wake up.
• Too hungry, or underfed. If you feed once a day and it's sluggish, try twice a day, or a bigger feeding each time.
• Too young. A starter under two weeks old is still establishing. Some don't rise reliably until week three. This is the most common "dead" starter of all, and the only fix is time.

The test that settles it

Before you give up on any starter, run this. Feed it, put it somewhere warm, and give it three days of consistent twice-a-day feedings. Mark its height with a rubber band after each feed so you can actually see change. The overwhelming majority of "dead" starters come right back with warmth, food, and a few days. They were never dead. They were cold and underfed.

Quick reference

• Hooch (grey liquid) → harmless, feed it
• Sharp/acetone smell → hungry, feed it
• Not rising → cold, underfed, or young. Warmth + food + time
• Sweet, yeasty, doubling → perfectly healthy
• Pink/orange streaks or fuzz → the one real problem, start over

I lost more sleep over a couple of ugly, sulking starters than I'd like to admit, and every single one of them was fine after three days of feeding. Your starter is much harder to kill than it looks. When in doubt, warmth and food, and give it time to prove you wrong.

Want this as a fridge-door one-pager, every symptom, cause, and fix in one table? That's the Is My Starter Okay? cheat sheet.