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Sourdough Starter Not Rising? Here's Exactly Why

Your starter isn't rising because something in its environment is off — temperature, feeding ratio, flour type, or water quality. That's it. There's no mystery. I've killed three starters before I understood this, and every single time the fix was simpler than I expected. Work through the causes below in order, and you'll have a bubbling, active culture within a few days.

The Temperature Problem Nobody Talks About Enough

Cold is the number one reason starters stall. A starter sitting at 65°F looks dead. It isn't — it's just slow. The yeast and bacteria that make your starter work are living organisms, and like most living things, they slow down when they're cold.

The sweet spot is 75°F to 80°F. At that range, a healthy starter peaks in 4 to 8 hours after feeding. At 68°F, that same starter might take 12 hours or longer. At 60°F, you'll wait all day and see almost nothing.

Find a warm spot in your kitchen — on top of the refrigerator, near (not on) a warm oven, or inside the oven with just the light on. An oven light holds most ovens around 75°F to 78°F. That small change alone has rescued more starters than any other fix I know.

You Might Be Overfeeding or Underfeeding It

Feeding ratio matters more than most beginners realize. If you feed a small amount of starter with a huge amount of flour and water, you've diluted your microbial population to the point where the culture is essentially starting over from scratch. It takes days to rebuild, not hours.

A 1:1:1 ratio — one part starter, one part flour, one part water by weight — is a reliable place to start. If your starter is weak or newly established, try a 1:2:2 ratio (one part starter to two parts flour and two parts water). Use our sourdough starter feeding calculator to get the exact amounts right for your jar size and schedule.

Underfeeding is the opposite problem. If you go too long between feedings without refrigerating your starter, the acids build up and the culture exhausts its food supply. The starter collapses and just sits there, flat and tired. Feed it, move it somewhere warm, and give it 24 hours before you panic.

Your Flour Is Working Against You

Not all flour is equal. Bleached all-purpose flour is fine for baking cookies. For growing a sourdough starter, it's a poor choice. The bleaching process strips out some of the wild yeast and microorganisms that your starter needs to thrive.

Unbleached all-purpose flour is better. Whole wheat flour is better still. Whole wheat contains more wild yeast and more natural sugars — both give your starter a real boost. I add one tablespoon of whole wheat flour to every feeding when I'm trying to strengthen a sluggish culture. The results show up within 24 hours.

Rye flour is even more potent than whole wheat. A 10 to 20 percent rye blend can jumpstart a struggling starter faster than almost anything else. Just don't go all-rye long-term unless you want a starter with a very sharp, sour flavor profile.

Chlorinated Water Is Quietly Killing Your Culture

Tap water in most cities contains chlorine or chloramine — added to kill bacteria. That's great for drinking water. It's bad for a culture you're actively trying to grow.

Chlorine is easy to deal with. Fill a jar with tap water and let it sit uncovered on the counter for 30 to 60 minutes. The chlorine off-gasses. Chloramine is harder — it doesn't evaporate — and you'll need to use filtered water or let water sit overnight with a small pinch of ascorbic acid (vitamin C powder) to neutralize it.

If your starter suddenly stalled after you moved to a new city or after your municipality sent out a water treatment notice, this is your culprit. Switch to filtered water for two weeks and see what happens. I've watched starters completely transform with just that one change.

Your Starter Is Too Young — Give It Time

A brand new starter from scratch takes 7 to 14 days to fully establish. Some take longer. During that window, things look discouraging. You see a little activity on day 2, then nothing on day 3, then bubbles again on day 5. This is normal.

The early stages of a starter are chaotic. Leuconostoc bacteria dominate first — they're not the good guys, and they produce CO2 without much leavening power. They die off as acidity builds. Then the lactobacillus bacteria and wild yeast take over. That transition looks like a stall. It isn't.

Keep feeding on schedule. Keep it warm. Don't add commercial yeast to try to speed it up — that just delays the process and skews the culture. If you're on day 10 and still seeing very little activity, check your temperature first and your flour second. Those two variables solve 90 percent of slow-start problems.

The Signs Your Starter Is Actually Working (But You're Missing It)

Sometimes the starter is rising — you're just not watching at the right time. A starter at 78°F might peak at hour 5 after feeding and then collapse entirely by hour 8. If you check at hour 8, it looks flat. You'd never know it doubled an hour ago.

Mark your jar. Use a rubber band or a piece of tape to mark the level of your starter right after feeding. Check it every 2 hours. You're looking for a doubling in volume, a dome at the top, and a network of bubbles throughout — not just on the surface. When it starts to flatten back down, that's the peak. That's when it's ready to bake with.

A starter that smells pleasantly sour and tangy with a slight yeasty note is a healthy starter, even if it's not rising dramatically. A starter that smells like acetone, vomit, or nail polish remover has gone too acidic and needs more frequent feedings — not a complete restart.

How to Reset a Struggling Starter in 3 Days

Here's the protocol I use when a starter is clearly struggling. Day one: discard all but 20 grams. Feed with 40 grams of unbleached flour and 40 grams of room-temperature filtered water (a 1:2:2 ratio). Place at 78°F. Watch it for 8 to 12 hours.

Day two: regardless of what you saw on day one, discard again down to 20 grams and repeat. Add a tablespoon of whole wheat or rye flour to the mix this time. You're rebuilding the microbial population with each feeding, and the discard step keeps acidity from accumulating and choking out the yeast.

Day three: if you see bubbles and any rise at all — even modest — you're on track. Keep feeding every 12 hours at room temperature. By day four or five, most starters have turned a corner. If nothing is happening at all by day five, use our sourdough starter troubleshooter to dig deeper into what might be going wrong.

Frequently Asked Questions

How long should it take for a sourdough starter to rise after feeding?

At 75°F to 80°F, a healthy, established starter doubles in 4 to 8 hours after feeding. A new starter that's less than two weeks old might take 12 hours or more, and the rise will be modest at first. Temperature is the biggest variable — every 10 degrees cooler adds hours to the timeline. If your kitchen runs cold (under 68°F), find a warmer spot before you assume something is wrong with your starter.

Can I fix a sourdough starter that hasn't risen in a week?

Yes, almost always. A starter that's been dormant or neglected for a week isn't dead — it's just depleted and possibly over-acidified. Discard down to 20 grams, feed with fresh unbleached flour and filtered water at a 1:2:2 ratio, and move it somewhere warm. Feed every 12 hours for three to five days. The key is consistency and warmth. Most "dead" starters come back within a week of this treatment.

Why does my starter smell bad but still have bubbles?

Bubbles and bad smell together usually mean the culture is alive but over-acidified. When a starter goes too long between feedings, the acids accumulate faster than the yeast can work, and you get a sharp acetone or alcohol smell. It's not ruined. Feed more frequently — every 8 to 12 hours at room temperature instead of once a day — and the smell will mellow within three to four days as the yeast population rebalances with the bacteria.

Does it matter what kind of jar I use for my starter?

The jar matters less than most people think, but a few things help. Use a straight-sided jar so you can accurately see the rise. Glass is ideal because it doesn't retain odors and lets you see the bubble structure throughout the culture. Make sure it's big enough — your starter should have at least twice its volume of empty space above it, or it'll overflow at peak activity. A loose-fitting lid (not airtight) lets CO2 escape without drying out the surface.

Ready to Skip the Guesswork?

Ready to start? The Mother is a 288-year-old heritage culture that arrives pre-fed and active — no two-week establishment period, no stalled starts, no wondering if something is wrong. It's the shortcut I wish I'd had when I was losing starter after starter to cold kitchens and city tap water.

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