Dry Sourdough Starter Guide

The most frequently asked questions about sourdough starters are regarding storage and general maintenance.

Specifically, how to store your sourdough starter if: 1) you don’t bake bread regularly and don’t want to feed your starter on a daily basis, 2) are going out of town or wish to take a break, or 3) wish to preserve or gift it to others. 

While I generally recommend keeping your sourdough starter at room temperature if you bake regularly, there are many instances in which you’ll need or want to take a break from regular feedings. 

Today I’ll be covering my favorite long-term (drying your sourdough starter) and short-term (refrigeration) method for storing a sourdough starter.

Note: It is important to have a vigorous, lively sourdough starter (strong enough for baking) before drying or refrigerating it. If you have been storing your mature starter in the refrigerator, I recommend transferring it to room temperature and giving it several regular feedings prior to completing the steps below.

If you’ve already established a strong sourdough starter and are experiencing troubleshooting issues, be sure to check out my Sourdough Starter Troubleshooting Guide, as well as my Sourdough Bread Troubleshooting Guide for more guidance. 

Reasons to Dry Your Sourdough Starter: 

Once you have an active, vigorous sourdough starter, I highly recommend taking the time to dry and preserve a portion of it from time to time. I always keep a jar of dried sourdough starter in my pantry for the following reasons: 

  • Back Up – it can take weeks to establish a strong sourdough starter, so it only makes sense to create a back-up in case anything happens to your main starter (accidents can happen, sourdough starters can be thrown out, used in their entirety, etc.). 
  • Long Term Storage – dried sourdough starter can be stored indefinitely if kept in a cool, dry place and can be revived to its original strength in just a few days (how to revive dried sourdough starter). if you wish to take an extended break from sourdough baking, this is a great way to preserve your original starter’s strength. 
  • Gift to Friends and Family – dried starter is the easiest way to gift it to friends and family (without the time required to make one from scratch). dried starter can be easily revived and used for bread baking in less than a week. 

How to Dry Sourdough Starter: 

Step One: Complete a regular feeding. Once your starter is lively and bubbly (ie. reached peak activity), transfer the discard to a large sheet of parchment paper (or silicone baking mat). Unless you are taking a long-term break from baking, be sure to reserve a normal quantity of your starter for regular maintenance. 

Step Two: Spread the sourdough starter into a very thin layer using a large offset spatula or bench scraper. The thinner the layer, the faster and more thoroughly the sourdough starter will dry out.

Step Three: Allow the sourdough starter to dry at room temperature for at least 24 to 48 hours (total time will vary depending on humidity level and may take longer). No moisture should be present and it should be very brittle once thoroughly dry. 

Step Four: Break the dried starter into small shards and transfer to a glass jar. Label with a date and cover with a tight-fitting lid. Store in a cool, dark place. Dried sourdough starter can be stored for years as long as it kept away from heat and moisture. 

At this stage, you can gift a portion of the dried starter to friends and family. I recommend always keeping a portion of dried starter in your pantry as back-up. You don’t need much! 

Dried Sourdough Starter in Glass Jar

Short-Term Storage Options: 

If you are traveling out of town or bake infrequently, the best short-term storage method for sourdough starters is the refrigerator. Cold temperatures slow yeast and bacteria activity, and will naturally extend how long your starter can sit between feedings. 

Note: Low hydration starters (80%-90% hydration) are generally slower in activity than high hydration starters (100% or higher hydration levels) as wild yeast and cultures have reduced mobility when less water is present. This can be a helpful trick to remember if you wish to store your starter in the refrigerator for more than a week or two without a feeding. 

I don’t generally recommend continuous long-term refrigeration as it can change the balance of wild yeast/lactic acid bacteria and yield inconsistent results when baking. However, figure out what works for your schedule and the type of bread you wish to bake!

Active Sourdough Starter in Glass Jar

How to Refrigerate Your Sourdough Starter: 

Before refrigerating your sourdough starter, discard a portion and give it a regular feeding. Allow the mixture to sit at room temperature for roughly 1 hour before transferring it to the fridge. 

Once you are ready to resume regular feedings or bake with your starter, remove it from the refrigerator and allow it to sit at room temperature (ideally between 74°F-78°F/23°C-25°C) until it is bubbly and has reached peak activity. Continue with regular feedings and observe its activity.

Depending on how long it has been refrigerated, a refrigerated sourdough starter may require an additional 2 to 3 regular feedings at room temperature before it has resumed regular activity levels and is strong enough for baking sourdough bread or sourdough pizza

Even if you bake infrequently and regularly store your sourdough starter in the refrigerator, it is important to give it fairly regular weekly feedings (discarding a portion) to keep it healthy and strong. 

If you’re looking for additional sourdough baking resources, be sure to check out the following: