How long does it take to make a sourdough starter from scratch?

Plan on 7 to 14 days. A healthy starter usually doubles reliably by day 7 in a warm kitchen, but cooler rooms can push it to two weeks. Slow is normal, not broken. The starter is ready when it doubles within 4 to 8 hours of a feed and passes the float test.

Can I make a sourdough starter without commercial yeast?

Yes, and you should. A real starter needs no added yeast at all. The wild yeast and lactic acid bacteria you need already live on the flour and in your kitchen air. Adding commercial yeast just hides whether your wild culture has actually woken up yet.

What flour is best for starting a sourdough starter?

Whole grain rye or whole wheat for the first few days, then switch to mostly white bread flour. Whole grains carry far more wild yeast and minerals on the bran, so they kick-start fermentation fast. Avoid bleached or self-rising flour, which can stall the culture.

My starter rose then stopped on day 3. Did I kill it?

Almost certainly not. The big rise around day 2 to 3 is a false rise driven by other bacteria, and it collapses when the real wild yeast takes over. The lull that follows is the most misread stage in starting a starter. Keep feeding on schedule and it usually comes roaring back by day 5 or 6.

What is the float test and is it reliable?

Drop a spoonful of starter into water at its peak. If it floats, it is full of gas and ready to bake. The float test is a useful green light, but not gospel. A stiff or rye starter can fail it while still being perfectly active, so always read the float test alongside the doubling and the smell.

How to Make a Sourdough Starter From Scratch