The fastest way to get sourdough starter is from a baker or friend, not a store

Most grocery stores and supermarkets do not stock sourdough starter on shelves. Your best options are asking a local baker for a small container (many give it away), requesting some from a friend or family member who bakes, or ordering dehydrated starter online to rehydrate at home. If you want to start when ready and know someone who bakes sourdough, that is almost always the quickest route—active starter is ready to use the same day.

If you do not have a baker or friend nearby, dehydrated starter from an online retailer works well and ships in a few days. The starter arrives dry and dormant, and you wake it up by mixing it with flour and water. This takes about five to seven days of feeding before it is strong enough to bake with, so plan ahead if you have a baking date in mind.

Key Takeaways

  • A local baker or friend with an active sourdough culture can give you starter that is ready to use the same day, with no shipping time or rehydration needed.
  • Dehydrated starter from online retailers like King Arthur Baking Company, Cultures for Health, and Etsy sellers arrives dormant and requires five to seven days of feeding before it is strong enough to bake.
  • Grocery stores rarely stock sourdough starter in the baking aisle; specialty food shops and farmers markets are more likely to carry it.
  • You can also grow your own starter from scratch using only flour and water, which takes about five to seven days and costs almost nothing.

Asking a local baker or friend

This is the simplest and cheapest option. Call or visit a local bakery that makes sourdough bread and ask if they will give you a small amount of their starter. Most bakers are happy to share—sourdough culture is meant to be passed along, and giving away a spoonful costs them nothing. Bring a clean jar and ask them to fill it halfway. The starter will be active and bubbly, ready to use in a recipe within a day or two.

If you know someone who bakes sourdough at home, ask them the same way. They likely have more starter than they need and will be glad to pass some on. Active starter from a friend or baker is the only option that requires zero waiting time and no rehydration step.

Ordering dehydrated starter online

Dehydrated starter ships quickly and stores for months before you use it. The most reliable online sources are King Arthur Baking Company, Cultures for Health, and independent sellers on Etsy. King Arthur and Cultures for Health both include instructions with their products. Prices range from about $8 to $15 per package, plus shipping.

When your dehydrated starter arrives, you will need to rehydrate it by mixing it with equal parts flour and water, then feeding it daily for five to seven days until it becomes active and bubbly. This waiting period is longer than using fresh starter from a baker, but the starter is shelf-stable and you can order it whenever you are ready to begin.

Specialty food shops and farmers markets

Some specialty grocery stores, natural food markets, and farmers markets sell fresh sourdough starter in small jars. Whole Foods locations sometimes carry it in the refrigerated section near other fermented foods. Farmers markets with a baker or fermentation vendor may also stock it. Call ahead to confirm they have it in stock, since availability changes week to week.

Fresh starter from a farmers market is ready to use the same day, like starter from a baker. Prices are usually $5 to $10 per jar. This option works well if you live near a farmers market that runs year-round or during the season when vendors are selling.

Growing your own starter from scratch

You can make sourdough starter at home using only flour and water. Mix equal parts whole wheat or rye flour and room-temperature water in a clean jar—start with one-quarter cup of each. Cover loosely and leave it on the counter. Each day, discard half the mixture and feed it with equal parts flour and water again. By day three or four, you should see bubbles. By day five to seven, it will smell sour and be active enough to bake with.

This method costs almost nothing and teaches you how the culture works. The downside is the wait time and the smell during the first few days, which some people find unpleasant. If you have time and patience, growing your own is a good learning experience and the cheapest option available.

What to look for when buying starter

Fresh starter should smell sour and yeasty, not rotten or like nail polish. It should be bubbly or have a layer of liquid (called "hooch") on top, which means it is alive and active. If it smells like acetone or rotten fruit, something has gone wrong and you should not use it.

Dehydrated starter should be dry and crumbly with no clumps or mold. Store it in a cool, dry place until you are ready to rehydrate it. Most dehydrated starters stay good for at least a year, though older starter may take longer to wake up.

Timing and planning

If you want to bake sourdough this week, get fresh starter from a baker, friend, or farmers market. If you are ordering online, add five to seven days for rehydration to your shipping time. If you are growing from scratch, plan for seven to ten days total before your first bake.

Once you have active starter, you will have it for as long as you want to keep it. Feed it once or twice a week if you store it in the refrigerator, or daily if you keep it on the counter. A single jar of starter can last for years with basic care.

Frequently Asked Questions

Can I use all-purpose flour to grow starter from scratch?

Yes, all-purpose flour works, though whole wheat or rye flour ferments faster in the first few days because it has more nutrients. You can switch to all-purpose flour once your starter is active. Many bakers use all-purpose flour for their mature starter.

How much starter do I need to buy?

A small jar or container—about one-quarter to one-half cup—is enough to start. You will feed it and it will grow. Within a few days you will have more than enough for a loaf of bread.

Does dehydrated starter work as well as fresh starter?

Yes, once it is rehydrated and active. Dehydrated starter takes a few extra days to wake up, but the final culture is just as strong and reliable as fresh starter. The difference disappears after the first week.

What if the starter I bought smells bad?

A sour, yeasty smell is normal and good. A smell like nail polish, rotten fruit, or ammonia means the culture has spoiled. Discard it and get a new one. This is rare with starter from reputable sources.

Can I mail starter to a friend?

Yes. Dehydrated starter ships easily. For fresh starter, let it dry out slightly on a piece of parchment paper, then mail it in a sealed bag or jar. Your friend can rehydrate it the same way as commercial dehydrated starter.