Does sourdough starter have to double before baking?

Doubling is a useful benchmark for many starters, but flour and hydration affect visible rise. Look for reliable activity over repeated feeds and follow the readiness cues in your recipe, rather than relying on a single height measurement.

Is the sourdough float test reliable?

It is only one clue. A starter may sink because of its flour, hydration or how the sample was handled. Assess its rise pattern, bubbles and feeding history alongside the test.

Why is my starter taking longer than yesterday?

A cooler room, a larger feeding ratio, a different flour or a change in the starter's condition can slow its rise. Compare the feed and temperature with previous entries before assuming something is wrong.

Is your sourdough starter ready to bake?

A starter is usually ready to leaven bread when it rises reliably after feeding and shows a repeatable pattern of activity. For an established starter, many recipes use it near its peak. A clock, a jar of bubbles or the float test alone cannot tell you everything.

Look for a repeatable rise

Mark the starter's height immediately after a feed. Use a straight-sided jar with room for expansion and keep the sides reasonably clear. A rubber band or removable mark makes growth easier to compare than memory does.

Look for bubbles through the mixture and a clear rise above the starting mark. Some starters double readily; others behave differently because of flour, hydration or feeding ratio. For a young starter, repeatable activity across several feeds is more useful than one dramatic rise early in its life.

Get to know the peak in your jar

After feeding, an active starter rises, reaches a high point and eventually falls. Around its peak, the top may change from domed to flatter before the mixture begins to recede. A tide mark on the glass can reveal a peak you missed.

For recipes calling for ripe starter, aim for the active window described by that recipe. The exact window depends on the jar and feed. Starter that has fallen is not automatically unusable, but its condition may affect flavour and fermentation speed; a fresh feed can make the timing more predictable.

Compare like with like

Record the feeding ratio by weight, flour, water and room temperature. A larger feed usually takes longer to mature than a smaller one under otherwise similar conditions. A warmer location generally speeds activity, while a cooler room can delay it.

Changing several things at once makes patterns hard to interpret. Try observing the same feed over a few cycles. Record the time to check again, rather than promising yourself it will peak at an exact minute.

Mark the level just after feeding.
Note the weights of starter, flour and water.
Check for rise and bubbles throughout, not only at the surface.
Record the highest level you actually observed; label a missed peak as unknown.

Treat quick tests as clues

The float test checks whether a small spoonful holds enough gas to float. Flour choice, hydration and handling can change the result. A floating sample is not proof that a new culture is mature, and a sinking sample does not by itself mean an established starter cannot bake bread.

If a starter changes unexpectedly, review recent feeding, temperature and storage changes. Activity is not a food-safety test. Visible mould or unusual pink or orange discolouration is a reason to stop using it and consult established food-safety guidance. A photo or this checklist cannot certify a starter as safe.