How to Revive a Sourdough Starter After Months in the Fridge

Sourdough starters are remarkably resilient. A starter forgotten in the back of the fridge for two months — even six — can usually be revived. Here's the routine that brings them back.

First, assess what you're looking at

Open the jar. Look at:

• Hooch — the dark liquid on top. Normal. Pour off or stir in.
• Color of the starter — should still be off-white or tan. Pink, orange, or green = throw out.
• Smell — strong vinegar or alcohol is normal. Sweet, putrid, or chemical = throw out.
• Mold — fuzzy growth on top. White or cream colored, just on top, can sometimes be scraped away. Anything colored: throw out.

If the starter passes the safety check, it can almost certainly be revived.

The revival routine (5 days)

Day 1

Pour off any hooch. Discard most of the starter, keeping about 20g.

Feed: 20g starter + 20g flour + 20g water.

Mix well. Cover loosely. Leave on the counter at room temperature.

Day 2

Probably no obvious activity yet. Discard most, keep 20g.

Feed: 20g starter + 20g flour + 20g water.

Day 3

You may see some bubbles forming. Smell may shift from sour to yeasty.

Discard most, keep 20g.

Feed: 20g starter + 40g flour + 40g water (slightly bigger feed now).

Day 4

Should be visibly active. Some bubbling, slight rise.

Discard most, keep 20g.

Feed: 20g starter + 40g flour + 40g water.

Day 5

Should be doubling within 6–8 hours of feeding.

Discard most, keep 20g.

Feed: 20g starter + 40g flour + 40g water.

By end of day 5 or day 6, your starter should be passing the float test and ready for baking.

Why feeding twice a day for revival

A neglected starter has weak yeast and out-of-balance bacteria. Frequent feeding:

• Provides fresh food
• Dilutes accumulated acid
• Lets yeast outgrow the bacteria
• Restores the population balance

A once-daily feed often isn't enough for revival.

Use whole grain to speed things up

Whole wheat or rye flour ferments faster. For revival:

• Use 50% whole wheat for the first 3 days
• Switch back to white flour as activity returns

The whole grain provides more nutrients, enzymes, and naturally-present microbes — accelerates revival.

What "ready" looks like

A revived starter:

• Doubles in 4–6 hours after feeding
• Has visible bubbles throughout
• Domes on top
• Passes the float test
• Smells pleasantly yeasty (not strongly sour)

Once you see all these signs, you can bake with it.

When to give up

If after 7 days of twice-daily feeding your starter:

• Has no bubbles at all
• Doesn't rise after feeding
• Smells putrid or chemical
• Has any pink, orange, or green color

Throw it out and start a new one. It's faster and safer than continuing to revive a dead starter.

A safer revival from a small piece

If you want to be conservative, take just 5g of the old starter and feed it generously: 5g + 50g flour + 50g water. Repeat daily.

Heavy dilution gives the surviving yeast and bacteria more room. The off-flavors and weak microbes get diluted out faster.

What if I don't see mold but it smells bad?

Strong sour smell is fine. Strong vinegar smell is fine. Slight nail-polish-remover smell (alcohol) is fine.

Bad smells:

• Rotten meat
• Sulfur
• Garbage
• Truly putrid

These suggest harmful bacteria have outcompeted the good microbes. Discard.

Storing your revived starter

Once revived, don't let it sit in the fridge for months again. A weekly feed (even when not baking) keeps a starter healthy:

• Pull from fridge weekly
• Feed once
• Let sit on counter 2 hours
• Return to fridge

Two minutes per week. Your starter stays predictable.

Backup strategies

Once revived, dry some of your starter:

• Spread thin on parchment
• Air-dry for 1–2 days
• Crumble into a jar

Dried starter lasts indefinitely. If your live starter ever dies, you can rehydrate the dried backup and revive it in 3 days.

This is your insurance policy against forgetting it again.

A real-world story

I've revived starters that sat in the fridge for 8 months. They came back in 4 days of twice-daily feedings. Neglected starters are tougher than they look — they go dormant rather than die.

If your starter looks borderline, try the revival before giving up. The success rate is high.