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Love sourdough, but looking for a bit more flexibility and ease when you bake with a starter? In The Casual Sourdough Baker, PJ shows you just how wonderfully stress-free sourdough baking can be, from simple but richly flavored loaves to countless easy ways to use your discard. If you're just beginning your journey, our Sourdough Baking Guide lays out the basics you need for success — whether you decide to become serious or go casual!

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You’ve wanted to learn to bake sourdough bread for the longest time. But starting a starter from scratch? “Wow, that can take a week or more and quite a bit of attention; do I really want to go there?”

But wait — someone just gifted you with some of their starter. Or you’ve decided to buy one that’s already mixed and ready, needing only a couple of feedings to get it up to speed. Awwright, sourdough bread here we come!

Then you realize there’s still that gray area between receiving your new starter and actually using it to make bread. Dealing with starter for the first time is kind of like bringing a newborn baby home from the hospital. You’ve read all the books and thought you were ready, but now that the baby is actually here: “WHAT DO I DO?”

First, relax. Your “baby” is going to be fine. Like all babies, your starter requires warmth, food, and attention. But unlike human infants, whose needs are pretty much nonstop, your starter needs very little attention; once you feed it, it can sleep happily in the back of your fridge for days (even weeks) at a time.

Jar of sourdough starter received from a friend, named Dough-Raise-Me. PJ Hamel
You've been gifted a jar of fresh sourdough starter. Now what?

To feed starter you received from a friend ...

Let's assume your friend has gifted you starter in storage mode (i.e., not having been fed over the past 24 hours). Like a baby, you need to first feed your new starter, then let it rest in a comfy spot. Here’s what to do.

Feed with flour and water

Take 1/2 cup (113g)* of the starter (discarding any additional starter) and place it in a medium-sized bowl: stoneware, glass, plastic, doesn’t matter what it’s made of (though if you use metal, be sure it’s stainless steel).

*If your friend has given you less than a half cup of starter (though, really?), it's OK. Go ahead and follow these instructions anyway, using the small amount of starter you've received. Bottom line, once it's been established (as has your new arrival, courtesy of your friend), sourdough starter will survive and thrive under all manner of maintenance feedings (which is what you're giving it here). It's only when you want to bake naturally leavened bread with it (bread with no added commercial yeast) that you need to pay close attention to how much and when you feed your starter. For the details on readying your starter for baking naturally leavened bread, see Putting your starter to work.

Stirring fed sourdough starter in a clear glass bowl, bag of King Arthur Flour and a digital scale in the background. PJ Hamel
Don't worry about any lumps in your fed starter; just make sure everything is well combined, with no dry floury patches.

Add 1/2 cup (113g) lukewarm water (tap water is fine) and a scant 1 cup (113g) unbleached all-purpose flour. Stir until everything is well combined.

Cover the bowl; it shouldn’t be completely airtight but you also don’t want the starter drying out, so a kitchen towel isn’t suitable. Try a reusable bowl cover or plastic wrap.

Time for a nap

Place the bowl in a moderately warm spot, somewhere between 68°F and 78°F. Options: Heat your microwave for 1 minute (to about 80°F), then place the bowl inside. Or place the bowl in your turned-off oven with the oven light on. Like a baby, your starter wants to be cozy, neither super-warm nor shiveringly cold.

Sourdough starter in a clear glass bowl, fed 11 hours ago, showing lots of bubbles, both large and small. PJ Hamel
Expanded? Bubbly? This starter is doing the happy dance!

After 8 hours (wouldn’t you love your new baby to sleep for 8 hours at a time?!), take a peek at the starter. Has it become bubbly and doubled in size? If so, great; it's ready to stash in the fridge or use in a recipe. If not, you'll want to feed it again.

Keep feeding your starter until it's vigorous and healthy

Give your starter another meal: Scoop out 113g (discarding the rest), place it in a bowl, feed it with 113g each unbleached all-purpose flour and lukewarm water, keep it warm, and wait 8 hours or so for it to grow.

If after its second feeding it hasn't doubled in size within 8 hours, don't give up; your new starter just may need some extra TLC. Continue feeding as directed above. In order to keep your schedule sane, move to feeding just twice a day, every 12 hours or so.

Two shots of sourdough starter in a jar, once right after it's been fed, once 8 hours later, when it's doubled in size. PJ Hamel
Your fed starter's goal: doubling in size within about 8 hours. Rubber band markers help you check its progress.

You can leave your fed starter in the bowl during this process, or do as I do: Transfer it to a 32-ounce straight-sided glass jar, such as a wide-mouth quart-sized canning jar. Loop a rubber band around the jar at the height of the starter, then measure how tall the starter will be when it’s doubled and loop another rubber band there. When it reaches the second rubber band it’s doubled in size.

Once your starter is reliably doubling in size within 8 hours of being fed, it's ready to bake with — or store for future use. If you plan on refrigerating your fed starter, let it rest at room temperature for 2 hours after its feeding before stashing it in the fridge. 

If after three to four days of feeding your starter doesn’t double within 8 hours of being fed, I’d recommend ditching it and buying a vital, healthy starter from King Arthur.

To feed fresh starter from King Arthur ...

As always, King Arthur does everything possible to guarantee your success: Just follow the feeding directions in the booklet that comes with the little jar of live starter you purchased, and your new baby will start to grow within hours — and grow, and grow!

If you haven’t yet bought your starter, here’s a preview of what you’ll do once it arrives.

Having fed a new starter more than once, here’s my suggestion: Begin in the evening, around or just after supper. That way, your starter will be ready to feed again the next morning, right around or just after breakfast. Unlike most new babies, this one is perfectly content to sleep through the night.

Jar of King Arthur fresh sourdough starter, just opened, sitting on top of its shipping box. PJ Hamel
Don't be surprised when you open your fresh King Arthur starter and see just a tablespoon or so in the bottom of the jar; that small amount is more than enough to get you going.

To begin, open the jar of starter; it’ll probably look a bit limp and soggy in the bottom of its container. That’s perfectly OK; it’ll perk up once it’s fed.

Decant and feed

Pour 1/4 cup (57g) of lukewarm water over the starter in its “travel jar.” By lukewarm, I mean just barely warm to the touch; nothing you’d want to take a bath in. Screw on the cap and shake-shake-shake to combine the starter and water. Then pour the resulting cream-colored liquid into a medium-sized (at least 2-quart) bowl or other roomy container. 

Bowl of sourdough starter on a scale, water and flour being stirred in as part of the feeding process. PJ Hamel
A digital scale makes feeding and caring for your starter easy; no messy measuring cups to wash!

Follow the directions in your booklet, using 1 cup (227g) lukewarm water and about 2 cups (227g to 241g) unbleached all-purpose flour for the starter's first feeding. Cover the bowl with your favorite reusable cover (or plastic wrap) and set it someplace warmish (68°F to 78°F is about right). Let the starter rest, undisturbed, for anywhere from 8 to 24 hours; the warmer your kitchen, the more quickly your starter will grow.   

Give the starter its second meal: discard all but 1/2 cup (113g) and feed the remainder with 1/2 cup (113g) each flour and water (you'll find the details in your booklet). Your starter should now double within 8 hours of this second feeding. But if it doesn't? Feed it once more. Once it doubles and bubbles within 8 hours of feeding, it’s ready to use in a recipe or go into the refrigerator for long-term storage, where you’ll only need to feed it once a week.

King Arthur fresh sourdough starter and crocks. Kristin Teig
Speaking of storage, check out this stoneware sourdough crock. It’s the perfect size for your King Arthur starter, and bonus: over-zealous fridge cleaners are less likely to mistake your starter for a forgotten leftover and throw it away!

Some people like to keep their starter on the counter, at room temperature, and feed it twice a day. The advantage is, your starter will be active and ready to bake when you are. The disadvantage? Well, having to feed it twice a day. I prefer the more flexible fridge routine.  

What’s next?

That’s it! Your baby is healthy, fed, and happy to nap until needed. Ready to take the next step and actually bake a loaf of bread? See our blog post, Putting your starter to work.

Finally, what about all that extra starter you’re supposed to discard along the way? Despite its name, you can save and use it in all kinds of recipes, from biscuits and pancakes to crackers and cake. Check out our sourdough discard recipe collection for inspiration. And if you’re uncomfortable with the amount of discard you’re generating, there’s a simple solution: reduce the size of your starter. See our instructions for maintaining a smaller sourdough starter.

Cover photo by Kristin Teig.

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About PJ Hamel

PJ Hamel grew up in New England, graduated from Brown University, and was an award-winning Maine journalist (favorite topics: sports and food) before joining King Arthur Flour in 1990. Hired to write the newly launched Baker’s Catalogue, PJ became the small but growing company’s sixth employee.PJ wa...
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