How to Revive a Neglected Sourdough Starter (Fridge, Hooch, Weeks Unfed)

The short answer

A sourdough starter that stopped bubbling after being neglected is almost never dead. Pour off (or stir in) any dark liquid, discard all but a small amount, and feed it generously with unbleached bread flour and 75–80°F (24–27°C) water. Keep it somewhere warm and feed it twice a day for 2–3 days. It's back when it reliably doubles within 4–6 hours of a feeding. The only real deal-breakers are visible mold or being exposed to heat above about 120°F (49°C).

Starter that never got going in the first place? See Sourdough starter not rising? 7 reasons and how to fix it.

What you're seeing and what to do

What you see or smell	What it means	What to do
Dark liquid on top (hooch)	It's hungry. Hooch is an alcohol byproduct of fermentation.	Pour off about half or stir it in, then feed
Nail-polish-remover (acetone) smell	Very hungry, but still fine	Discard and feed; it should mellow after a feeding or two
Strong vinegar smell	Hungry	Feed. The smell should turn yeasty and tangy again
Flat, no bubbles after weeks in the fridge	Dormant, not dead	Rescue feeding below, then twice-daily feeds somewhere warm
Bubbles on top but no rise	Probably too thin	Thicken with more flour until it's a stiff paste
Rose, then collapsed back down	Healthy. It peaked while you weren't looking	Mark the jar with a rubber band after feeding so you can see the rise
Fuzzy growth, or pink or orange spots	Mold	Discard the starter
Left in a hot oven or above ~120°F	Heat may have killed the yeast	Try a few feedings, but it may not recover

Step-by-step revival

1. Look before you toss

Check the surface for mold: fuzzy growth, or pink or orange spots. If you see it, discard the starter. Anything else (hooch, a gray layer, strong smells, total flatness) is almost always fixable. If you bought it from us, message us before throwing it away. We can usually help you save it.

2. Do a rescue feeding

Keep just 25 g of starter (about a tablespoon) and feed it 50 g flour and 50 g water. That gives a small, sleepy population a lot of fresh food. Use: - Unbleached bread flour (all-purpose also works; avoid bleached and self-rising) - Filtered tap or spring water at 75–80°F (24–27°C). Avoid distilled, purified bottled or reverse-osmosis water.

Mix it to a very thick paste that holds a blob shape on the spoon. If it's runny like pancake batter, add a little more flour.

3. Keep it warm

The yeast slows down a lot below about 68°F (20°C). Good warm spots include the top of the fridge, the oven with only the light on (check it doesn't get too hot), or a seedling heat mat. Keep the jar off cold stone countertops.

4. Feed twice a day for 2–3 days

Discard down to roughly a quarter of the jar each time, then feed 1:1:1 (equal parts starter, flour and water by weight). The first rise may take up to 24 hours. After a couple of rounds it usually snaps back.

5. Give it a boost if it's still sluggish

• Swap in whole wheat or rye for a feeding or two. Whole grains carry extra nutrients that can wake a lazy starter.
• Try one big 1:10:10 "feast" feeding (1 part starter, 10 parts flour, 10 parts water). It ferments longer and builds strength. See our feeding ratios guide.

6. Confirm it's ready

It's ready to bake when it doubles within 4–6 hours of a feeding, is bubbly throughout, smells yeasty and slightly tangy, and looks airy and webby when you tilt the jar.

How long revival takes

• In the fridge up to about 2 weeks: one feeding at room temperature is often enough. It should be active in 6–12 hours.
• In the fridge for more than 2 weeks without feeding: plan on two rounds of feeding over 24–48 hours before it can raise bread.
• Neglected for longer, or very sluggish: twice-daily warm feedings for 2–3 days, then reassess.

Stop it happening again

• Bake rarely? Keep it in the fridge with the lid tightened and feed every 7–10 days. Our feeding schedule guide covers every routine.
• Make a dried backup. Spread some active starter thin on parchment, let it dry completely and seal the flakes in a bag. Dried starter can last for months or even years.
• Use your discard. Pancakes, crackers and cookies all work. See our discard recipes.

Still flat after all that?

Message us with your flour, your water, your kitchen temperature and how many days you've been feeding. Every Great Grandma's Sourdough starter includes personal support and a free 1-year replacement warranty. If you need a fresh start, our dehydrated starters make a good shelf-stable backup to keep in the pantry.

FAQ

How do I know if my sourdough starter is dead?

It's rarely dead. Visible mold (fuzzy growth, or pink or orange spots) or exposure to extreme heat above about 120°F are the only real signs. Everything else is usually fixable.

Can I revive a starter that's been in the fridge for months?

Usually, yes. Discard to a small amount, feed it warm twice a day for 2–3 days, and wait until it doubles within 4–6 hours of a feeding before baking.

What is the dark liquid on my sourdough starter?

That's hooch, an alcohol byproduct of fermentation. It means the starter is hungry. Pour off about half or stir it back in, then feed.

Why does my starter smell like nail polish remover?

It's very hungry. The acetone smell usually fades after a feeding or two.

How long does it take to revive a sourdough starter?

From a few hours to 2–3 days. A starter that's been in the fridge over two weeks typically needs two rounds of feeding over 24–48 hours.

Should I use different flour to revive my starter?

Unbleached bread flour works well. A feeding or two with whole wheat or rye can give a sluggish starter a boost.