To make sourdough starter from scratch, mix equal parts flour and water daily until the mixture smells pleasant, bubbles, and doubles after feedings.
Flour, water, and time are all you need to build a lively sourdough starter at home. No packets of yeast, no special tools, just a steady routine that lets wild yeast and friendly bacteria grow in a simple mixture on your counter.
If you have ever asked yourself, “How Do You Make Sourdough Starter From Scratch?” and felt unsure where to begin, this article walks you through a clear, predictable process. You will see what to mix, what to watch for each day, and how to keep your new starter healthy for years of baking.
How Do You Make Sourdough Starter From Scratch? Starter Basics
A sourdough starter is a living mix of wild yeast and lactic acid bacteria that grows in a paste of flour and water. Given fresh flour and water at warm room temperature, these organisms feed, release gas, and acidify the mixture. The gas helps bread rise, and the acids add flavor and help keep the starter safer by lowering pH.
Baking teachers at King Arthur Baking show that a simple starter can be ready for baking in about 5 to 7 days when kept around 70°F (21°C) and fed regularly. Extension specialists at the University of California Cooperative Extension also stress steady temperature, loose covering, and regular feedings so helpful microbes take over the jar.
To keep the process simple, this method uses equal parts flour and water by weight (often called 100% hydration), daily feedings, and a loose lid or cloth so gas can escape.
Seven-Day Sourdough Starter Overview
The table below shows the basic flow for the first week. After the table, you will see each step in more detail so the routine feels natural.
| Day | What You Do | What You Should See |
|---|---|---|
| Day 1 | Mix equal weights whole grain flour and water; leave at warm room temperature. | Thick paste, no bubbles yet. |
| Day 2 | Stir, discard about half, feed with equal weights fresh flour and water. | Maybe a few bubbles, mild aroma, slight rise or none. |
| Day 3 | Discard and feed once or twice, keeping the same ratio. | More bubbles, puffed texture, sharper smell. |
| Day 4 | Keep daily or twice-daily feedings at the same ratio. | Regular rise and fall, surface covered in bubbles. |
| Day 5 | Continue feedings; mark jar to track rise. | Starter doubles between feedings, smells tangy and pleasant. |
| Day 6 | Feed again; adjust temperature or flour mix if growth seems slow. | Stronger and more reliable rise after each feeding. |
| Day 7 | Feed and check rise time; set some starter aside for long-term keeping. | Vigorous starter ready to use in bread recipes. |
Flour, Water, And Simple Tools
You do not need fancy equipment to start. A kitchen scale makes feedings easier, yet you can still succeed with cups and spoons if that is what you have.
Choosing Flour For Your Starter
Whole grain flours, such as whole wheat or rye, tend to wake up wild yeast faster because they carry more mineral content and bran. Many bakers start with whole grain for the first few days and then switch to unbleached all-purpose flour once the starter is active.
Any flour you use should be fresh and free from added baking powder or baking soda. Standard bread flour, all-purpose flour, or a blend with a little rye or whole wheat all work well once the starter has settled into a steady rhythm.
Water And Container
Room-temperature water works best. If your tap water has a strong chlorine smell, let it sit in an open container for a few hours or use filtered water so the microbes in the starter do not struggle. The goal is a smooth, thick batter, similar to pancake batter.
Use a clear glass jar, a food-safe plastic container, or a small crock. Aim for a container that holds at least four times the volume of your mixed starter so there is room for rising. Cover the top loosely with a lid, cloth, or plastic wrap with small holes so air can move while dust and insects stay out.
Helpful Extras
A rubber band or piece of tape on the outside of the jar helps you track how far the starter rises between feedings. A spoon or small spatula reserved for the starter keeps the process tidy and predictable. None of these extras are required, yet they make the routine smoother.
Making Sourdough Starter From Scratch Step By Step
Now that you know what you need, let’s walk through the daily routine in more detail. Once you move through this sequence a couple of times, “How Do You Make Sourdough Starter From Scratch?” stops feeling like a puzzle and turns into a simple kitchen habit.
Day 1: Mix Flour And Water
In your jar, stir together 60 g whole wheat or rye flour and 60 g water. Scrape down the sides so everything sits in a rough level. The mixture should be thick but stirrable; add a small splash of water if it seems dry or a spoon of flour if it seems soupy.
Cover loosely and leave the jar at warm room temperature, around 70°F to 75°F (21°C to 24°C), for 24 hours. Do not worry about bubbles yet; the microbes are just getting started.
Day 2: First Feeding
By the next day, you might see a few bubbles or dark spots where the flour has hydrated. Even if nothing appears to happen, press on. Stir the starter, discard about half, and add 60 g fresh flour and 60 g water. Mix to a smooth batter again, cover, and leave for another 24 hours.
The discard step keeps the total amount manageable and supplies fresh food so the right microbes can grow.
Day 3 And Day 4: Build Strength
On day 3, the starter often smells stronger and shows more bubbles along the sides of the jar. Start feeding twice a day if the starter rises and then slumps before the next feeding. Each time, stir, discard about half, and add equal weights flour and water.
Repeat the same pattern on day 4. If the starter seems lazy, you can keep one feeding per day and give it a little extra whole grain flour to encourage activity.
Day 5 To Day 7: Watch For A Reliable Rise
By day 5, a healthy starter doubles between feedings, smells tangy but pleasant, and shows a foam of bubbles on top. Feed at least once a day, or twice if the starter rises and falls quickly. Use the rubber band or tape mark to see how high it rises after each feeding.
Keep this routine for day 6 and day 7, adjusting timing to your kitchen. Warmer rooms shorten the rise window; cooler rooms extend it. A mature starter rises to its peak within 4 to 8 hours after a feeding, then slowly deflates.
When your starter can double in that time frame for several days in a row, it is ready to raise bread. At this point, the question “How Do You Make Sourdough Starter From Scratch?” has a clear answer in your own kitchen jar.
Feeding And Storing Your Sourdough Starter
Once the starter is active, you can keep it at room temperature or in the fridge, depending on how often you bake. The basic pattern stays the same: discard, feed with fresh flour and water, allow the starter to rise, then either bake or store.
How Much To Keep And How Much To Feed
A common feeding ratio for a home baker is 1:1:1 by weight: equal parts starter, water, and flour. For example, you might keep 50 g starter, feed it with 50 g water and 50 g flour, let it rise, and then measure what you need for a recipe.
If you want to bake large batches or several loaves at once, you can scale the feeding up the night before baking. If you only bake once a week, you can keep a smaller base amount so you are not discarding large quantities.
Room Temperature Vs Refrigerator
Room-temperature storage suits people who bake several times a week and enjoy feeding daily. Refrigerator storage slows the microbes, so once-a-week feedings keep the starter in good shape between bakes.
| Storage Method | Typical Feeding Pattern | When Starter Is Ready |
|---|---|---|
| Room Temperature, Daily Baking | Feed 1–2 times per day at 1:1:1 ratio. | When doubled, bubbly, and slightly domed on top. |
| Room Temperature, Occasional Baking | Feed once per day; build extra the day before baking. | After a strong rise within 6–8 hours. |
| Refrigerator, Weekly Baking | Feed 1:1:1, let it start to rise, then chill; revive with two room-temperature feedings before baking. | When it rises well after a fresh room-temperature feeding. |
| Refrigerator, Rare Baking | Feed every 1–2 weeks; give several room-temperature feedings before use. | Once it doubles at room temperature in a predictable window. |
| Thicker Starter (Lower Hydration) | Feed with less water for a stiff dough-like starter. | Rise appears as cracks and splits rather than a tall dome. |
Signs Your Starter Is Ready To Bake
A ready starter rises at least to double volume, smells mildly acidic with a hint of fresh dough or yogurt, and looks airy when you stir it. Many bakers also use a float test: a spoonful of starter placed in a glass of water often floats when the starter is well aerated.
If the starter smells harsh, like nail polish remover, or seems thin and weak, a few back-to-back feedings at room temperature usually bring it back into balance.
Common Problems, Safety, And Fixes
Starters do not need to be fragile, yet problems can appear, especially in the first weeks. Learning to read sights and smells keeps your starter safe and effective.
When To Discard And Start Over
Mold on the surface, colored streaks that look pink, orange, or bright red, or a strong rotten odor are all signs that something unwanted has taken over. In that case, throw the starter away, scrub the jar well, and begin again with fresh flour and water.
Thin gray or brownish liquid on top, often called “hooch,” usually means the starter is hungry rather than spoiled. You can pour it off or stir it back in, then feed the starter more often for a few days.
Slow Or Weak Starter
If the starter does not rise much, first check temperature. A cool counter slows yeast growth. Moving the jar to a slightly warmer spot or using slightly warmer water often helps. You can also switch back to whole grain flour for a short stretch to encourage activity.
Feeding more frequently, such as every 12 hours instead of every 24 hours, also helps build strength. Give it a few days of steady care before deciding it has failed.
Sour Or Sharp Flavor
Starters naturally lean sour as lactic acid bacteria grow. If the flavor feels too sharp in your bread, feeding more often or using a higher feeding ratio (for instance 1:2:2) can mellow the taste. Cooler storage, such as a fridge, can favor acetic acid, which pushes the flavor in a sharper direction, while warmer and wetter conditions lean toward lactic acid and a softer tang.
Using Your New Sourdough Starter
Once your starter rises reliably, you can use part of it in bread, pancakes, waffles, or crackers. A typical bread recipe uses active starter at its peak, mixed with fresh flour, water, and salt to form dough. The remaining starter goes back in the jar for the next feeding.
Before your first bake, plan at least one or two “practice” loaves so you can see how your dough behaves with your specific flour, water, and room conditions. Each bake teaches you something about timing, shaping, and proofing that no written method can fully show.
Starter Routine Snapshot
Here is a quick routine many home bakers follow once the starter is mature:
- Take the starter out of the fridge, if chilled, and let it warm slightly.
- Stir, discard down to a small base amount, and feed with equal parts flour and water.
- Wait until the starter rises to double and shows a domed, bubbly surface.
- Measure what you need for your recipe and mix your dough.
- Feed the remaining starter, let it rise a bit, then store at room temperature or in the fridge.
Follow this pattern for a few weeks, and the phrase “How Do You Make Sourdough Starter From Scratch?” turns from a search query into a skill you own. Your jar of lively starter becomes a steady partner in the kitchen, ready whenever you feel like baking fresh bread.
