Why Is My Sourdough Starter Bubbling but Not Rising?

Is your sourdough starter bubbling like a cauldron but refusing to rise tall and proud? You’re not alone. Many home bakers face this exact issue—a sourdough starter bubbling but not rising—and it can be downright frustrating. But don’t toss it out just yet! Whether you’re nurturing a brand new starter or troubleshooting an old one, this guide will walk you through why your sourdough starter isn't rising and how to fix it.

Now, darlin’, let me tell y’all about my cousin Becky. She’s got a heart as big as Texas and the patience of a saint—except when it comes to waiting on her sourdough starter. A few summers back, she decided to try her hand at making her own bread from scratch. She mixed up her flour and water, set her little jar of starter on the counter, and fed it faithfully like a pet goldfish.

A few days in, she called me up, all flustered. “Mary Claire,” she huffed, “my starter is bubbling like a pot of gumbo, but it ain’t rising one bit! What am I doin’ wrong?”

If your starter is bubbling but not rising, don’t you go thinking you’ve got a dud. It’s just missing one little piece of the puzzle. So let’s roll up our sleeves, put on our aprons, and figure out what’s keepin’ that starter from rising tall and proud like a Sunday church hat. 

If your starter is too watery, those little bubbles just float to the top and pop instead of lifting the mixture. It’s like trying to blow up a balloon with a hole in it—no matter how hard the yeast works, it just can’t trap the gas.

Fix It:

• Use a 1:1 ratio by weight (not volume) for flour and water.
• If it’s soupy, feed it with a little more flour to thicken. Aim for a thick pancake batter consistency.

New starters (less than 7–10 days old) often bubble before they rise. The bacteria show up first, but yeast takes a bit more time to build up its strength.

Fix It:

• Feed it consistently once or twice daily.
• Be patient—it can take two weeks or more to mature.

All-purpose flour isn’t nutrient-rich enough for a starter in its early stages. Your wild yeast needs more minerals and organic matter to grow.

Fix It:

• Switch to whole wheat or rye flour for a few days.
• Once active, you can return to using all-purpose flour.

Yeast loves warm environments. If your kitchen is below 70°F (21°C), your starter may struggle to rise, even if it's bubbling.

Fix It:

• Find a warmer spot: on top of the fridge, in the oven with the light on, or near an appliance like a coffee maker.
• Wrap it in a towel or use warm water (80–85°F) when feeding during winter.

Inconsistent feedings starve the yeast. But overfeeding can also dilute the yeast too much before it can establish itself.

Fix It:

• Feed daily (or twice daily as it strengthens).
• Always discard half before feeding.
• If it falls before your next feed, it’s hungry!

If your starter is in a shallow dish or wide bowl, it might actually be rising—you just can’t tell!

Fix It:

• Use a clear, narrow container like a mason jar or tall glass.
• Mark the level with a rubber band or tape to track rise more easily.

• Float Test: Drop a spoonful into water—if it floats, it’s good to go!
• Rises & Falls on Schedule: Doubles or triples in 4–6 hours after feeding.
• Smells Tangy, Not Funky: Should smell sweet or mildly sour—not like gym socks.

If your starter is bubbling, you’re already halfway there. A few small tweaks, a little patience, and a lot of love, and you’ll have that starter rising tall and proud in no time.