Start a Sourdough Starter: A Plain Guide to Baking That Keeps Going

A sourdough starter sounds like a serious commitment, but it is really just flour, water, and time. Once it is alive and settled into a routine, it stays in your fridge for weeks with almost no effort. Fall and winter are good times to start one, because a starter does not care about the weather and the payoff is warm bread when you want it most.

This guide walks through building a starter from scratch, keeping it healthy with the right feeding ratio, and using the excess you remove each time so nothing gets wasted.

What a starter actually is

A starter is a living culture of wild yeast and the bacteria that naturally live on flour. When you mix flour and water and let it sit, those microbes multiply. The yeast produces gas that makes bread rise, and the bacteria produce the tangy flavor that gives sourdough its character.

You do not need to buy yeast or a starter from anywhere. The organisms are already on the flour you have in the cupboard. Your job is just to feed them a consistent diet and keep them comfortable.

What you need to begin

Keep the equipment short. You likely have all of it already.

• Flour. All-purpose or bread flour works for most people. Whole wheat or rye makes a starter that runs more vigorously early on, so many beginners use a little of one of those for the first few days.
• Water. Plain tap water is usually fine. If your water is heavily chlorinated, let it sit out overnight or use filtered water.
• A jar. A clean glass jar with room for the starter to grow. A wide-mouth jar is easier to stir and clean.
• A scale (optional but helpful). Weighing flour and water by grams makes feeding consistent, which is the main thing a starter wants.

A good habit is to weigh your feedings. A 1:1:1 ratio by weight is the easiest starting point. That means one part starter, one part water, and one part flour. If your starter is 50 grams, you feed it 50 grams of water and 50 grams of flour.

Building the starter, day by day

Building a starter takes about a week. It will be ready when it reliably doubles in size after feeding and smells pleasantly sour instead of like something gone bad.

1. Day one. In a clean jar, combine about 50 grams of flour and 50 grams of water. Stir until there are no dry bits. Cover loosely with a cloth or a lid set on without sealing. Leave it at room temperature.
2. Day two. Check for small bubbles. Mix in another 50 grams of flour and 50 grams of water. Stir well.
3. Days three through six. Each day, discard about half the mixture, then feed the rest with equal parts flour and water by weight. (Keep what you discard, see the section below on using discard.) The mixture may smell sharp or even a little like acetone early on. That is normal and usually fades as the culture balances.
4. Day seven or so. If the starter is doubling in size within 6 to 12 hours of a feeding and smells pleasantly tangy, it is ready to use. If it is sluggish, keep feeding for a few more days. There is no fixed deadline.

Do not judge a starter on a single day. Their activity rises and falls, especially early on. Focus on the trend over several days.

The feeding routine that keeps it alive

Once your starter is established, you do not need to feed it daily if it lives in the fridge. Stored in the refrigerator, a healthy starter can go a week or more between feedings and stay fine.

For routine feeding, you can fall back on the simple 1:1:1 ratio:

• Remove the starter from the fridge.
• Discard (or set aside) all but about 50 grams.
• Add 50 grams of water and 50 grams of flour.
• Stir, cover loosely, and either leave at room temperature to use soon, or return to the fridge if you are not baking now.

If you want a faster, stronger rise for baking, feed more flour and water relative to the starter, roughly a 1:2:2 or 1:3:3 ratio (one part starter, two or three parts each of water and flour). More food per unit of starter gives the yeast more to work with.

A few signs things are off, and what they mean:

• A thick gray liquid on top. That is hooch, and it means the starter is hungry. Pour it off, feed as usual, and it will perk back up.
• A sharp acetone smell. The starter is being fed too little or left too warm. Feed it more regularly or move it somewhere cooler.
• Pink or orange streaks. This can point to unwanted bacteria. If you see those colors, it is safest to start over rather than risk it.
• No bubbles at all. If the starter is young, keep feeding. If it is established and suddenly flat, check that your flour is fresh and that you are feeding enough.

What to do with the discard

Feeding a starter always produces more than you keep, and the excess is called discard. Discard is perfectly useful, even when it is not at its most active. It adds flavor and moisture to all kinds of baking. Rather than throwing it away, keep a jar in the fridge and collect discard over a few days.

Easy ways to use discard:

• Pancakes and waffles. Discard batter makes tender, tangy pancakes with no extra yeast needed.
• Crackers. Roll it thin with a little salt and olive oil, score it, and bake until crisp.
• Muffins and quick breads. Discard replaces part of the liquid and flour in many recipes.
• Sourdough croutons or flatbreads. Simple, forgiving projects that use up a lot at once.

One honest caution: discard is usually not strong enough to leaven a full loaf of bread on its own. For bread that rises well, use your active starter just after a feed. Reserve discard for the recipes above. If you do not want to keep discard around, you can simply throw it away or compost it, and that is completely fine too.

Keeping it simple for the long haul

The biggest reason people quit sourdough is that they make it complicated. A starter does not need constant attention. It needs a routine you can actually keep.

Consider these ground rules:

• Feed by weight, not volume, so the ratio stays consistent.
• Keep it in the fridge when you are not baking, and pull it out to wake it up a day before you want to bake.
• Use a scale and a jar lid that is loose, so gases can escape without drying the starter out.
• Do not panic over a slow day. Temperature, flour, and timing all matter, and starters have off days like everything living does.
• Label your discard jar so you remember what is in it and when you added to it.

Sourdough rewards patience and consistency more than any fancy technique. If you feed it on a schedule that fits your life, it will keep giving you good bread, good pancakes, and a quiet sense of being able to feed yourself a little more than you did before.

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— C. Steward 🍎