how to feed and maintain a sourdough starter
Share this post!

You’ve just made a brand new sourdough starter from scratch or received some from a friend. What do you do with it now? I’ll show you how to feed and maintain a sourdough starter (the easy way!) to keep it happy and healthy for baking.

This post may contain affiliate links. See my full disclosure. As an Amazon Associate I earn from qualifying purchases.

Pin for later!

how to feed and maintain a sourdough starter pinterest image

In my previous post, I shared my method for making an Easy Sourdough Starter from Scratch. If you don’t have a starter of your own yet, you can visit that post to begin the process!

Once you have a mature, bubbly starter in your hands, it’s time to learn how to feed, use, and maintain your sourdough starter.

Bubbly ripe (active) sourdough starter in a Weck jar

Caring for sourdough starter is the part that seems to scare people at first. The process is not hard, but there are different ways to go about maintaining a starter (which you’ll quickly realize if you start perusing the internet).

Not to worry… I’ll break down the basics for you in a straightforward way, and you’ll fall into a comfortable routine of your own as you get going!

You’re already well on your way to baking delicious homemade goods like Sourdough Cinnamon Raisin Bread, Soft Sourdough Breadsticks, or Sourdough Pizza Crust.

Additional Sourdough Guides for Beginners:

How to Feed a Sourdough Starter

Since your starter is a living fermented culture, you’ll refresh or “feed” it regularly by removing extra starter and stirring in new unbleached all-purpose flour and filtered water. (We’ll talk about how much in a second.)

You’ll need to feed the starter to activate it before adding it to a recipe.

Start with a digital kitchen scale to weigh your ingredients accurately (tare the scale out to “zero” before each new addition). Choose a jar or bowl that will allow sufficient room for your starter to almost triple in size. I like a 3/4 liter Weck jar.

Stir together the starter, flour, and water with a little silicon spatula, and scrape the inside edges as clean as you can.

fed unripe sourdough starter right after mixing mother starter, flour, and water

You can place a rubber band or a line drawn with a dry-erase marker at the starting point so you can clearly see how much it rises.

Cover the fed starter with a loose-fitting lid and allow it time to become “ripe” (active) in the jar.

Note: A starter is considered “ripe” or “active” when it reaches its peak (highest possible point) in the jar or has just begun to fall from its peak. It should have almost tripled in size, look airy with lots of bubbles throughout, and have a yeasty, sweet, and slightly sour aroma.

This is the point when you’ll use it in a recipe (or discard) and feed it again.

Understanding Feeding Ratios and Temperature

You can build your starter up or scale it back anytime you need to.

No matter how much starter you keep, you’ll feed it using a ratio of 1 part starter, 1 part flour, and 1 part water by weight (e.g. 100 grams starter, 100 grams flour, and 100 grams water).

Note: Feeding a starter with equal weights flour and water maintains a “100% hydration starter.” This consistency of starter is standard for most sourdough bread recipes.

With this 1:1:1 feeding ratio, you can expect your starter to become active in about 4 hours at 75°F (23°C) if you’ve used room temperature water.

You could also choose to feed your sourdough starter with a 1:2:2 ratio (e.g. 50 grams starter, 100 grams flour, 100 grams water), a 1:3:3 ratio (e.g. 50 grams starter, 150 grams flour, 150 grams water) or an even greater ratio of flour and water to starter (or somewhere in between).

Basically, you shouldn’t feed a large amount of sourdough starter a smaller ratio of flour and water. Feed it at least its own weight in new flour and then add water to match the weight of the flour. (Remove extra starter first if you have too much.)

These ratios will still maintain your starter at the same consistency (100% hydration) since you’re feeding with equal weights flour and water, but the starter will take more time to metabolize the extra flour and become bubbly.

You can build your starter up with successive feedings (allowing it to peak in between feedings) if you really need a generous amount.

Always insure you’ll end up with enough ripe starter to save some for next time after you take what you need for a recipe.

Using Feeding Ratios and Temperature to Your Advantage

Since you want your starter to peak around the time you’re ready to bake, you can use feeding ratios to your advantage to control how fast or slow your starter will ripen.

The temperature of your water and your kitchen are two other variables that come into play. Cooler temperatures will slow the activity of your starter, while warmer temperatures will speed up the process (70°-80°F is ideal for a starter).

If your kitchen is chilly, you can place the jar of starter in a folding proofer box or in a turned-off oven with the oven light on (turn the light off it the temperature gets too warm after a while). You could also try wrapping it in a towel or setting the jar in a bowl of warm water.

An ambient thermometer is inexpensive and helpful to place next to your starter so you know what the temperature is for sure.

So as an example, if I am feeding my starter before bed and want it to peak in the morning for baking, I may feed with cold water using a 1:3:3 or 1:4:4 ratio. My kitchen is usually cooler at night which will also keep it from peaking too early.

If I am feeding in the early morning and want it to peak quickly so I can start a recipe late morning or early afternoon, I could feed using a 1:1:1 ratio with lukewarm water and place it in a warm spot.

How to Maintain Sourdough Starter (Easy Refrigerator Method)

If the living yeasts and bacteria in the starter are often left to starve between baking projects, you’ll end up with an overly acidic starter that isn’t able to leaven bread productively.

While your starter is out at room temperature, it will need to be fed every time it peaks in the jar (probably twice a day).

This would be an overwhelming maintenance routine if you’re only baking 1-3 times per week, and you’d probably be discarding a lot of starter to boot.

The easy solution is to slow the activity of your starter by storing it in the refrigerator until you’re ready to activate it for baking.

Using Sourdough Starter from the Fridge

Several hours before you’re ready to bake, remove the starter from the fridge and stir it together if there is any separation or liquid floating on the surface.

Discard excess if necessary and feed the starter. As soon as the refreshed starter peaks in the jar, it’s ready to go.

After you use most of the starter for baking, place the lid snuggly on the remaining starter and place it back in the refrigerator.

You can wait to feed it if you’ll be pulling it out again in the next couple of days. However, If you’ll be leaving the starter in the fridge for the rest of the week, feed it again before you tuck it away so it has plenty of fresh flour (it doesn’t need to rise first).

This is all the attention your starter will need as long as you bake at least once a week. If you take a break from baking, pull your starter out once weekly, feed it, and place it back in the fridge.

Reviving a Sluggish or Neglected Sourdough Starter

If you haven’t touched your starter for over a week or you change the type of flour you’re feeding with, refresh it with 2-3 feedings in succession at room temperature (allowing it to peak with each refreshment) to strengthen it before baking again.

Your starter will likely survive even a month of negligence in the fridge, it will just need some regular feedings at room temperature to bounce back.

Once it’s consistently rising and bubbling as usual, you can use it for baking and resume a normal maintenance schedule.

how to feed and maintain a sourdough starter

How to Feed and Maintain a Sourdough Starter (Easy Refrigerator Method)

Yield: 250 grams (over 1 cup) starter
Prep Time: 5 minutes
Additional Time: 4 hours
Total Time: 4 hours 5 minutes

An easy sourdough starter feeding and maintenance routine for the home baker. See notes for possible adjustments.

To make a homemade starter, visit this post:


For a Single Feeding:

  • 50 grams sourdough starter
  • 100 grams unbleached all-purpose flour
  • 100 grams filtered water, room temperature


  1. Feed: Place a clean jar (a 3/4 liter jar is a good size) or other suitable container on a digital kitchen scale and tare the scale to "zero." Weigh out the correct amount of sourdough starter, flour, and water (tare to "zero" after each addition) and stir everything together with a small silicon spatula to combine. Scrape the inside edges clean.
  2. Activate: Cover starter with a loose-fitting lid to keep it from drying out. Leave it at room temperature until it peaks (reaches its highest possible point) in the jar. It should be bubbly throughout, almost triple the size it started, and have a pleasantly sweet but slightly sour aroma. (Place a rubber band or make a line with a dry-erase marker at the starting point if you want to see clearly how much it rises.)
  3. Use for baking: Remove up to 200 grams (about 1 cup) at its peak to use for baking.
  4. Store remaining starter: Leave the remaining starter in the jar, place the lid on securely, and store the starter in the refrigerator. (If you will not be baking again in the next couple of days, repeat step 1 to feed the starter before tucking it away in the fridge. It doesn't need to peak.)
  5. When you are ready to bake again, pull the starter out of the fridge and repeat steps 1-4.
  6. If you do not bake again in the next 7 days, pull it out of the fridge, refresh it according to step 1, and place it back in the fridge (it doesn't need to peak first).


  • This is a 1:2:2 feeding ratio (1 part starter, 2 parts flour, 2 parts water). You can adjust this ratio or the amount of starter you're going to keep on hand and feed anytime. (Make sure you'll always have enough starter to save for the next time.) Basically, insure you feed your starter its own weight or greater in fresh flour. Add water to match the weight of the flour. You can always discard extra starter before you feed if you have too much to begin with. The smaller the ratio of starter in your mix, the longer your starter will take to ripen.
  • Warmer temperatures will speed the activity of your starter while cooler temperatures will slow the activity of your starter. Ideally, keep your starter around 75°F (23°C) when activating it for baking (a cooler temperature would come in handy if activating overnight to bake in the morning). Keep it as warm as 80°F (26°C) if you want it to peak quicker for baking the same day. (If your kitchen is chilly, place it in a foldable proofer box or turned-off oven with the light on, wrap it in a towel, or place the jar in a bowl of warm water. An ambient thermometer comes in handy). You can also adjust the temperature of your water to control how fast or slow it will peak. Use cold water to slow it down, lukewarm water to speed it up.
  • If you neglect your starter longer than a week, give it 2-3 successive feedings at room temperature (allowing it to peak with each feeding) until it's consistently bubbling and rising after each feeding.

Sourdough Starter Maintenance FAQs

1. How soon after feeding sourdough starter can I use it?

Ideally, you’ll use your starter at its peak (or highest point) in the jar.

As we have discussed above, many variables come into play to affect how slow or fast your starter will ripen. A healthy starter fed at a 1:1:1 ratio with room temperature water will likely become active in about 4 hours at 75°F (23°C).

2. What can I do with discard starter?

You can save discarded starter in a separate container to use in a “sourdough discard” recipe like pancakes, waffles, muffins, or banana bread. These recipes are specifically formulated for sourdough starter that isn’t fed.

Discard can also be composted or fed to backyard chickens.

3. How can I maintain my starter at room temperature if I will be baking daily?

If you choose to bake nearly every day of the week, it would be most convenient for you to keep your starter out at room temperature so it’s always ready to go when you are.

I would recommend refreshing the starter every 12 hours. This would give you two opportunities to use the starter when it’s ripe: either in the morning or in the evening.

Use a small amount of starter (e.g. 20-50 grams) and a large enough ratio of flour and water to make enough ripe starter for a recipe leaving 20-50 grams of starter for next time.

Your goal it to get your starter to peak consistently around each 12 hour mark.

You can do a little experimenting to get your feeding ratio right for the temperature of your kitchen so that it’s not peaking too early. A 1:4:4 or 1:5:5 ratio might be just right.

If it peaks too fast, decrease the amount of starter in your ratio the next go around. You can also try setting it in a cooler part of your home and use cold water to refresh it.

If it’s taking longer than 12 hours to peak, use slightly more starter in your ratio next time. You can try keeping the starter warmer (75°F is ideal) and refreshing with lukewarm water.

Obviously, the time of year can affect how quickly your starter peaks. It’s a learning curve at first to maintain starter at room temperature, but you’ll get into a grove with your maintenance routine before you know it.

4. Do I have to use all-purpose flour to feed my sourdough starter?

All-purpose flour is practical to use in both white bread recipes and recipes with wholegrain.

You can also feed a sourdough starter with bread flour or organic flour. You’ll just want to avoid bleached flour.

You can surely switch your starter to a wholegrain (wholemeal) flour (or a combination) if that suits your baking preferences or gives your bread certain characteristics you’re after. Common flours to use would be whole wheat or rye flour.

Some bakers also choose to switch their starters to wholegrain flour temporarily to strengthen the starter.

You can switch the flour you’re feeding with anytime. It’s possible that your starter may need a few regular feedings at room temperature to adjust to the change.

5. How do I know if I have killed my starter?

If you’ve added water above 120°F to your starter or if you notice colorful mold, you will want to toss it and start again.

More likely, though, you’ve neglected your starter for a while and it just needs some TLC. It may have gray/brown liquid (called “hooch”) floating on the surface, but that is nothing to worry about.

Remove any dry crusty bits from the top of the starter. Pour off or stir in the hooch.

Keep the starter out at room temperature and feed at a 1:1:1 ratio every 12 hours until it exhibits all the signs of a healthy starter again.

6. Can I keep my starter at a different consistency than 100% hydration?

Yes, you can keep a starter that is more dry or wet, but a 100% hydration starter is probably the most practical for the home baker. This is the consistency that most sourdough recipes are built upon, and you won’t have much maintenance or discarded starter if you store it in the refrigerator between bakes.

Dry starters require more effort to incorporate into a recipe (physically and mathematically), and wetter starters can ripen too quickly.

7. What is a levain?

Some sourdough recipes will direct you to create a levain (also called “leaven”) to add to the dough mixture later. Don’t let the terminology scare you; simply follow the directions in the recipe.

A levain is basically a preferment (made from a little of your ripe starter, flour, and water) that will have certain characteristics to affect the flavor or performance of the dough you’re making.

A levain allows you to make a starter especially suited for a particular bake without making any changes to your mother starter.