The fastest way to get sourdough starter is from a baker or friend who already has one
You can buy sourdough starter from bakeries, farmers markets, online retailers, and grocery stores—but the cheapest and fastest option is usually someone local who bakes sourdough and can give you a small jar. A living sourdough starter costs between $5 and $25 when you buy it, but it's free if you ask a baker or friend to share theirs. The starter itself is just flour and water that has been fermenting for days or weeks, so there's nothing special about paying for it beyond convenience.
If you don't know anyone who bakes sourdough, your next best move is to call local bakeries and ask if they sell starter or will give you a small amount. Many bakers are happy to share because they understand the culture—literally and figuratively. If that doesn't work, you have several reliable places to order online or buy in person.
Key Takeaways
- Asking a local baker or friend for starter is free or very cheap and arrives alive and ready to use when ready.
- Bakeries often sell small jars of starter for $5 to $15, and some give it away if you ask.
- Online retailers like Etsy, King Arthur Baking Company, and GEM Cultures ship dried or liquid starter that you rehydrate at home before using.
- Grocery stores rarely stock starter, but some natural food markets and specialty shops carry it in the refrigerated section.
- Dried starter takes 5 to 7 days to become active after you add water; liquid starter is ready to use in 1 to 2 days.
Bakeries and farmers markets near you
Call or visit bakeries that make sourdough bread and ask if they sell starter. Most will either sell you a small jar for $5 to $15 or give you a portion for free if you buy a loaf. The starter they give you is the same culture they use in their own bread, so you know it works and is suited to your local climate.
Farmers markets often have bakers selling sourdough, and some bring starter jars to sell alongside their bread. You can taste the baker's bread before you commit to their starter, and you can ask them directly how to feed and store it. This is the best option if you want to start with confidence and have someone local to ask questions later.
Online retailers that ship starter
King Arthur Baking Company sells liquid sourdough starter in a 4-ounce jar for around $8. It arrives in the mail and is ready to use within 1 to 2 days of opening. This is a reliable choice because King Arthur is a well-known baking supplier and the starter is may provide to be active.
Etsy has dozens of sellers offering dried sourdough starter, usually for $8 to $20 per jar. Dried starter is lighter and cheaper to ship than liquid starter. You rehydrate it by mixing it with equal parts flour and water and letting it sit for 5 to 7 days before you use it in bread. Read the reviews carefully—look for sellers who have shipped many times and have recent feedback saying the starter arrived alive.
GEM Cultures specializes in fermentation cultures and sells both dried and liquid sourdough starter. Their dried starter is around $10 and takes about a week to set up. They also sell a "mother culture" kit if you want to learn more about how starter works.
Cultures for Health sells dried starter in small packets for $8 to $12. The packets are designed to be mixed with flour and water right away, with detailed instructions included. This is a good choice if you want the simplest possible rehydration process.
Specialty food shops and natural grocers
Some Whole Foods locations and independent natural food stores keep sourdough starter in the refrigerated section near the yogurt and fermented foods. Call ahead to ask if they stock it—availability varies by location. When they do carry it, the price is usually $8 to $15 for a small jar, and it's ready to use when ready.
Specialty baking supply shops sometimes stock starter as well, especially if they're in areas with strong sourdough communities. These shops often have staff who bake sourdough themselves and can give you information on feeding and storage.
What to look for when you buy starter
Whether you buy online or in person, look for starter that has a sour smell and visible bubbles or a layer of liquid on top. These signs mean the culture is active and ready to use. If the starter smells like nail polish or acetone, that's normal—it means the yeast and bacteria have been working and producing alcohol.
Dried starter should be stored in a cool, dry place and will last for months or even years before you rehydrate it. Liquid starter needs to go in the refrigerator as soon as it arrives and will stay alive for weeks without feeding, though you should feed it once a week if you plan to keep it longer than that.
Ask the seller or baker how old the starter is and how often it's been fed. A starter that's been maintained for years is usually more reliable than one that's brand new, though both will work.
Rehydrating dried starter at home
If you buy dried starter, you'll need to wake it up before you can use it in bread. Mix equal parts dried starter, flour, and water—for example, 1 tablespoon of each—in a clean jar. Stir well, cover loosely with a cloth, and leave it on the counter at room temperature.
Feed it once a day for 5 to 7 days by discarding half the mixture and adding equal parts fresh flour and water. By day 5 or 6, you should see bubbles rising within a few hours of feeding, and the smell should be pleasantly sour. Once it doubles in size within 4 to 8 hours of feeding, it's ready to use in bread.
This process takes patience, but it's the same whether you buy starter online or get it from a friend. The dried version just needs a few extra days to come back to life.
Cost comparison: buying versus making from scratch
Buying starter costs $0 to $25 depending on where you get it. Making starter from scratch—just flour and water left on the counter for 5 to 7 days—costs almost nothing but requires time and attention. You have to feed it daily, watch for signs of life, and troubleshoot if it doesn't seem to be working.
Most home bakers find that buying starter saves time and removes the guesswork. You're paying for a culture that's already established and proven to work. If you want to learn how fermentation works or you enjoy the process of building something from nothing, making starter from scratch is rewarding—but it's not faster or cheaper than buying.
Frequently Asked Questions
Can I use starter that's been sitting in the fridge for months without feeding?
Yes, but you need to feed it a few times before you use it in bread. A neglected starter will have a dark liquid on top (called "hooch") and may smell like alcohol or nail polish. Discard half the starter, feed it with fresh flour and water, and repeat once a day for 3 to 5 days until it's bubbly and active again.
Is there a difference between starter I buy and starter I make myself?
No. Sourdough starter is just wild yeast and bacteria living in flour and water. Whether you buy it or make it, the culture will adapt to your kitchen's temperature and humidity over time. After a few weeks of feeding, a bought starter and a homemade one behave the same way.
What's the difference between dried and liquid starter?
Dried starter is lighter to ship and lasts longer in storage, but it takes 5 to 7 days to rehydrate before you can bake with it. Liquid starter is ready to use in 1 to 2 days but costs more to ship and needs refrigerator space. Both work equally well once they're active.
Do I need to refrigerate starter right after I buy it?
If you bought liquid starter, yes—put it in the fridge as soon as it arrives. If you bought dried starter, store it in a cool, dry cupboard until you're ready to rehydrate it. Once you rehydrate dried starter, move it to the fridge to slow fermentation.
Can I buy starter and use it the same day?
Only if you buy liquid starter from a local baker or store. Shipped liquid starter needs 1 to 2 days to recover from travel. Dried starter always needs 5 to 7 days to rehydrate. Plan ahead if you want to bake sourdough on a specific date.