When Is My Sourdough Starter Ready to Bake With?
Baking with a starter that is not ready is the number one cause of dense, flat first loaves. Here are the signs that actually predict a good rise, and the popular test that does not.
The four real readiness signs
- Reliable doubling: the starter at least doubles within 4–8 hours of a feeding, and does it consistently for several days in a row.
- Bubbles throughout: not just surface froth, but bubbles visible through the jar walls, top to bottom.
- A domed (or just-flattening) top: a dome means still rising; the peak is the ideal baking window. A collapsed, sunken top means you missed it, feed and catch the next peak.
- A pleasant tang: yogurt-sour, mildly fruity. A sharp acetone or nail-polish smell means it is overdue for a feed, not ready.
Why the float test lies
Dropping a spoonful in water to see if it floats is popular, but unreliable in both directions: a stirred or wet starter can sink while perfectly ready, and rye-heavy starters may never float at all. Treat floating as a bonus signal, never the deciding one.
Timing your bake
Mix your dough when the starter is at or just before peak: domed, bubbly, aromatic. If it peaked hours ago and fell, give it one more feeding and bake on the next cycle. For morning mixing, feed the night before with cooler water or a bigger ratio so the peak lands after breakfast.
Let AI call the baking window
Photograph your jar and Sourdoughy tells you whether your starter is at peak, still climbing, or past it, so you mix dough at the moment it will raise bread best.
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