How to Tell When Your Sourdough Starter Is Ready to Bake With
The float test isn't the whole story. Here's what to actually look for.
How to tell when a sourdough starter is active enough to bake with, covering the visual signs, smell, and timing that matter more than the float test alone.
A sluggish starter is one of the most common reasons sourdough bread turns out dense. Knowing exactly when your starter is ready makes a bigger difference than almost any other step in the process.
Look for Visible Bubbles Throughout
An active starter should be full of bubbles, not just a few on the surface. If you can see bubbles running through the sides of the jar, that's a strong sign it's fermenting well.
Watch It Double in Size
Mark the level of your starter right after feeding it with a rubber band or piece of tape. A starter that's ready to bake with should roughly double in size within four to eight hours, depending on the temperature of your kitchen.
Do the Float Test, But Don't Rely on It Alone
Drop a small spoonful into a glass of water. If it floats, that's a good sign, but some healthy starters sink and still bake beautifully. Use it as one clue, not the final word.
Smell Matters More Than People Think
A ready starter smells pleasantly tangy and slightly yeasty, almost like beer or yogurt. A sharp, harsh vinegar smell usually means it's past its peak and needs another feeding before you bake.
Bake at Peak, Not Past It
A starter that has already started to sink back down after doubling has passed its strongest point. Aim to mix your dough while the starter is still rising, right around its peak, for the best rise in your finished loaf.
If your starter isn't hitting these signs consistently, it usually just needs more frequent feedings and a slightly warmer spot, not a total restart.