How to Make Sourdough Starter

You only need two ingredients and seven days to build a living, bubbling sourdough starter from scratch — and once you have it, you have a leavening agent that can last for decades. This guide walks you through every day of the process, explains why each step matters, and gives you the troubleshooting knowledge to revive your starter no matter what life throws at it.

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What Is a Sourdough Starter?

A sourdough starter is a mixture of flour and water that captures and cultivates wild yeast and lactic acid bacteria from your environment. This naturally fermented mixture serves as the leavening agent in sourdough bread, giving it the distinct tangy flavor, open crumb, and chewy crust that commercial yeast simply cannot replicate. The starter is kept alive by regular feedings of fresh flour and water, allowing the microbial community to thrive indefinitely.

Why Make Your Own Sourdough Starter?

There are real, practical reasons to build your own starter rather than buying commercial yeast:

• No commercial yeast needed ever again — once established, your starter replaces packaged yeast for all bread, pancakes, waffles, and more.
• Better flavor and texture — the lactic acid bacteria produce organic acids that create sourdough’s signature tang and help preserve the bread naturally.
• Improved digestibility — long fermentation breaks down gluten and phytic acid, making the bread easier on the gut for many people.
• Endless versatility — use the same starter (or its discard) for sourdough English muffins, focaccia, pizza crust, pancakes, and waffles.
• Self-sufficient and zero-waste — discard can be turned into crackers, crepes, and flatbreads instead of being thrown away.

Ingredients for a Sourdough Starter

Ingredients

Flour

• Why it matters: Whole-wheat or rye flour on Day 1 gives the starter a head start — the bran contains more wild yeast and bacteria than white flour. Once active, you can switch to all-purpose for daily maintenance. For the best results, use a kitchen scale (ASIN B000FGDLT8) to weigh rather than measure by volume — precision matters more than it does in regular baking.

Water

• Why it matters: Chlorine and chloramine in tap water can inhibit or kill the wild yeast you are trying to culture. Use filtered water, or let tap water sit uncovered overnight to let the chlorine dissipate. Room-temperature water (around 70–75°F / 21–24°C) works best — cold water slows fermentation and hot water above 100°F can kill beneficial bacteria.

What Other Baked Goods Can You Make with a Sourdough Starter?

Once your starter is active, you can use it — or its discard — in a wide range of recipes. Here are some favorites:

• Sourdough Bread — the classic. Use our guide at how-to-make-sourdough-bread.
• Sourdough English Muffins — perfect nooks and crannies. See our sourdough English muffins recipe.
• Focaccia — crispy outside, airy inside. Try our easy homemade focaccia bread.
• Pancakes and waffles — tangy, fluffy, and easy to make with discard.
• Pizza crust, crackers, biscuits, cinnamon rolls — once you have a starter, the list is almost endless.

How to Make Your Own Sourdough Starter

With just two ingredients and patience, you can have an active starter within 5–7 days.

How to Maintain a Sourdough Starter

Once established, keeping your starter healthy is straightforward. Here is the routine:

Equipment:

• Glass jar (wide-mouth mason jar works great — use a banneton proofing basket (B07G6VXW7Y) later when you progress to bread)
• Kitchen scale (B000FGDLT8) for precise ratios
• Bench scraper (B00004OCKL) for clean transfers

Feeding ratios: A common starting ratio is 1:1:1 (starter : flour : water by weight). As your starter matures and you want to control its rise timing, you can move to 1:2:2 or 1:5:5 for a slower rise.

Frequency: At room temperature, feed every 12–24 hours. If you bake infrequently, store in the refrigerator and feed once a week.

Signs of a Healthy Starter

• Bubbles throughout the jar, not just on top.
• Doubles in size within 4–8 hours of feeding.
• Pleasant, slightly tangy or yeasty aroma (like beer or yogurt).
• Passes the float test: a small spoonful dropped in water floats when ready to bake.

Frequently Asked Questions

What if I do not bake frequently?

Store your starter in the refrigerator. Feed it once before refrigerating, then pull it out and feed it at least once a week to keep it alive. When you are ready to bake, take it out 24 hours in advance, let it come to room temperature, and feed it at least once before using it in your recipe.

There is a grey or dark liquid on top of my starter — is it ruined?

No. That liquid is called “hooch,” a byproduct of fermentation that forms when the starter is hungry. Simply pour it off (or stir it back in for a more sour flavor) and feed the starter as normal. However, if your starter turns pink or orange, that signals contamination — discard it and start fresh.

What should my starter smell like?

A healthy starter smells pleasantly tangy, like yogurt or mild vinegar. A very sharp acetone smell means it needs more frequent feeding. If it smells rotten or putrid (not just sour), check for contamination — pink or fuzzy growth is a sign to start over.

My starter is not bubbling — is it still alive?

Check whether it rises (not just bubbles) in the hours after feeding. Activity varies with room temperature — colder rooms slow everything down. Try moving it somewhere warmer (top of the refrigerator, inside the oven with just the light on). If you have not fed it in weeks, it will take 2–3 days of daily feedings to bounce back.

Can I freeze my sourdough starter?

Yes. Freeze a portion as a backup by spreading a thin layer on parchment paper, letting it dry completely, then storing the flakes in a sealed bag. To revive, rehydrate the flakes in water, add flour, and feed daily until active again — usually 3–5 days.

Why is my starter not rising after 7 days?

The most common culprits are: chlorinated tap water, a room that is too cold (below 65°F / 18°C), too-infrequent feedings, or using flour that lacks enough wild yeast. Try switching to whole-wheat flour for the next few feedings, use filtered water, and move to a warmer spot. If you live in a region where wild yeast is sparse, a small amount of commercial dried sourdough starter can jumpstart the culture.

How to Make Sourdough Starter

We have assembled an easy-to-follow guide on how to make a glorious loaf of tasty sourdough bread at the comfort of your own home.
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Prep Time:5 minutes mins
7 days d

Equipment

• glass jar

Ingredients

• ½ cup whole-wheat flour
• non-chlorinated water
• all-purpose flour for maintaining the starter

Instructions

• Day 1: combine ½ cup of whole-wheat flour and ¼ cup water in the jar. Stir thoroughly and cover with a towel and rubber band. Let it sit for 24 hours at room temperature. Keep it in an area that is somewhat warm. Very cool rooms tend to slow the action of a starter.
• Day 2: The first feeding after 24 hours. Add ½ cup of all-purpose flour and ¼ cup of water. Give it a good stir, and wait for 24 hours.
• Day 3: After 24 hours, check for bubbles. Bubbles are a sign something is going right. Discard half of the starter, add ½ cup of all-purpose flour and ¼ cup of water, and stir thoroughly. Let it sit for 24 hours.
• Day 4: Again discard half of the starter, and feed with ½ cup of all-purpose flour and ¼ cup of water, stirring thoroughly. Let it sit for 24 hours.
• Day 5 onward: Continue this routine until the starter is consistently bubbling and doubling in size within 8 hours of each feeding. At this point, you can store the starter in the refrigerator and feed it about once a week. When you plan to use the starter, pull it out of the refrigerator 24 hours in advance to feed it and allow it to warm up and grow.

Notes

If you have repeatedly attempted sourdough starters with dismal results, it could be that the wild yeast strains in your area are not well suited to sourdough. You can easily overcome this by purchasing a dried commercial starter. Cared for properly, your starter should last for many years. If you have other ferments or cultures in your kitchen, keep your starter at least several feet away from them to prevent cross-contamination.