Sourdough From Scratch: Raise a Starter and Bake Your First Loaf

Bread is one of the oldest home skills, and sourdough is the version that never needs a supply run. The leaven is alive, reusable, and it lives in your kitchen. Flour, water, salt, and patience is the entire input list.

This guide covers the whole first pass: starting a sourdough culture from flour and water, reading its signs, and using it to bake a loaf you can be proud of. It takes about two weeks from jar to loaf, and the starter you grow is something you will keep for years.

What You Are Actually Starting

A sourdough starter is a mixed culture of wild yeasts and friendly bacteria. The yeasts make the bread rise. The bacteria make the mild tang, improve the flavor, and help the bread stay fresh longer. There is no yeast packet involved. The culture comes from the air and from the flour itself.

You do not need a "wild yeast" purchase to start one. Flour and water are enough, and most home starters are healthy within a week or two of daily feeding.

The basics of a starter are:

• Flour. All-purpose works, and whole wheat speeds things up. Plain wheat flour with nothing added is what you want. Chlorine in tap water is usually fine for starters, but filtered or spring water is a gentler start.
• Water, warm to the touch (around 75 to 80 degrees Fahrenheit).
• A jar with a loose lid or a bandana cover. The culture breathes and puffs, so you never want a tight seal.
• A small kitchen scale. Sourdough is done by weight, not by volume, and the scale is the one baking tool that genuinely matters here.

Starting the Jar, Day by Day

The whole process runs on one simple ratio, called 1:1:1: equal weights of starter, flour, and water. That means if you are using 40 grams of existing starter, you feed it 40 grams of flour and 40 grams of water. Everything else follows from that.

A typical first week looks like this:

1. Day one. Mix 40 grams of flour and 40 grams of warm water in a clean jar. It will look like thin batter. Nothing happens yet.
2. Days two through three. Small bubbles may appear. The smell can be flat, tangy, or a little sour. That is normal.
3. Days four through five. The starter should rise after a feed, usually doubling within six to ten hours. The smell turns pleasantly sour, like yogurt or ripe fruit.
4. Days five through seven. Keep feeding once or twice a day. You want a reliable pattern of doubling after each feed. That predictability is the sign of a starter ready for bread.

Feed it on a schedule you can actually keep. Once a day is fine for most people, and in a warm kitchen twice a day keeps it from getting overly sour. Consistency matters more than precision, and a day you miss does not ruin the jar.

Reading Your Starter

The starter tells you how it is doing, and the signs are straightforward:

• It rises and falls. A healthy starter climbs after feeding, peaks, and slowly falls. The fall is not a problem. It is the culture running out of food.
• A gray or amber liquid layer on top (called "hooch"). This means the starter is hungry. Pour it off or stir it in, then feed. It is not dangerous, just a signal.
• Fuzzy growth in any color, or pink or orange streaks on the surface. That is contamination. Dump the starter, wash the jar with hot soapy water, and start again. Do not try to salvage it.

A common beginner fear is that the starter will "die." In practice, starters are remarkably hard to kill. Hungry, sour, and slow is recoverable. Contamination with visible mold is the only version that should end the run.

Keeping It in the Fridge

Once the starter is active, you can move it to a low-activity schedule to match how often you bake. Most people keep their jar in the refrigerator and feed it once a week. When you are ready to bake, take it out a day or two ahead and feed it twice, at 12 hour intervals, at room temperature. It should double comfortably before you mix the dough.

A weekly-fed refrigerated starter uses almost nothing. A couple tablespoons of flour and a little water per week is the entire ongoing cost of your leaven.

Baking Your First Loaf

Use a simple recipe that is easy to hold in your head. This version uses 100% hydration, meaning the water weight equals the flour weight:

• 500 grams flour (bread flour or strong all-purpose)
• 500 grams water (room temperature)
• 100 grams active starter (doubled and bubbly)
• 10 grams salt

The full sequence takes about a day and a half, but the hands-on time is under an hour.

1. Mix (autolyse). Mix the flour and water and let it rest for 30 to 60 minutes. This gives the flour time to absorb water before the starter goes in.
2. Add starter and salt. Break the starter up in the dough and fold in the salt. Rest 15 minutes.
3. Stretch and folds. Over the first hour, do 3 to 4 rounds of stretch and folds. Each round is quick: pull one side of the dough up and over, rotate the bowl a quarter turn, repeat. This builds strength without kneading.
4. Bulk fermentation. Let the dough rise at room temperature (around 75 degrees Fahrenheit) until it has grown about 50 to 75%, usually 4 to 6 hours. It should look puffy and have small bubbles along the edges. Warmer kitchens go faster, cooler ones slower. Judge by the dough, not the clock.
5. Shape. Turn the dough onto a lightly floured surface and shape it into a round or a batard. Let it rest, uncovered, for 20 to 30 minutes.
6. Proof in the fridge. Put the shaped loaf in a floured bowl or banneton, cover it loosely, and refrigerate for 12 to 24 hours. A cold, slow proof is the most forgiving option for a first bake and it develops flavor.
7. Bake. Heat a Dutch oven with its lid inside your oven at 500 degrees Fahrenheit. Take the loaf out of the fridge, score the top with a sharp blade, put it in the Dutch oven, and bake 20 minutes covered, then 20 to 25 minutes uncovered at 450 degrees, until the crust is deep golden brown.
8. Cool. Let the loaf rest at least an hour before slicing. The crumb is still setting as it cools, and a hot loaf will slice gummy.

Mistakes That Sink a First Loaf

Most failed loaves come from a small number of recurring problems:

• Underproofed dough. The loaf collapses in the oven or comes out dense. Next time, give the bulk fermentation a little more time until the dough clearly grows.
• Overproofed dough. It spreads flat in the oven and has large, open holes. Watch for the dough starting to sag before you shape.
• Starter that is not ready. If it does not reliably double within 6 to 8 hours after feeding at room temperature, it is not strong enough to lift a loaf. Keep it on the feeding schedule a few more days.
• A tight lid on the jar. The culture needs air exchange. Use a loose lid, a bandana, or a cloth cover.
• Measuring by volume. Cups of flour vary wildly by how you scoop. Weighing flour, water, and starter is what makes the recipe repeatable.
• Chasing perfection on loaf one. The first loaf is usually decent, not beautiful. Sourdough is a feedback skill, and every bake tells you what to adjust.

What Makes It Worth It

A sourdough starter is one of the most useful small systems a household can run. It costs almost nothing to keep, it makes better bread than any store loaf, and the same skill stretches into pizza dough, flatbreads, and enriched bakes later on. The starter can be dried on a baking sheet and kept as a backup in a drawer, so even a bad year does not erase it.

Start the jar. It is the cheapest experiment in the whole homestead, and the bread at the end is real proof that you can feed your table from a culture you grew yourself.

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— C. Steward 🍎