Last reviewed: 2026-06-05
Starter readiness checker
Is my sourdough starter ready to bake?
Use doubling time, peak shape, aroma, age, and temperature to decide whether your starter is bake-ready today.
Your sourdough starter is ready when it reliably doubles after a 1:1:1 feeding, looks bubbly and slightly domed, smells pleasantly tangy, and reaches peak in about 4 to 8 hours at warm room temperature. The float test can help, but it is not reliable by itself.
Starter readiness score
How the checker scores readiness
- A mature starter should rise predictably after feeding, not just once after a false early surge.
- Doubling speed matters most when it is paired with visible bubbles, a domed peak, and a clean sour aroma.
- The float test only shows trapped gas. A starter can float and still be weak, or sink after degassing even when it is usable.
Bake-ready signs to look for
- Use grams and a consistent 1:1:1 feeding when testing readiness.
- Mark the jar after feeding so you can judge the true percent rise.
- If the starter smells harsh or solvent-like, feed it for several cycles before baking.
- In US kitchens, 74F to 78F is a helpful warm-room range for predictable starter activity.
FAQ
How do I know if my sourdough starter is ready to bake with?+
It should reliably double after feeding, show bubbles throughout the jar, smell clean and tangy, and reach peak within about 4 to 8 hours in a warm room.
Is the sourdough float test reliable?+
The float test is useful but incomplete. It only indicates gas retention, so it should be checked alongside rise speed, aroma, and repeated feeding behavior.
Can I bake if my starter doubles but does not float?+
Yes, often. If the starter doubles predictably and looks vigorous, it may be ready even if a stirred or degassed spoonful sinks.
How long should starter take to double after feeding?+
A strong starter commonly doubles in about 4 to 8 hours after a 1:1:1 feeding at warm room temperature.