How to Reactivate a Dehydrated Sourdough Starter
- Jenny Derrickson
- Jun 22, 2024
- 4 min read
Updated: Jun 4
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Have a dehydrated sourdough starter sitting in your pantry? Good news, bringing it back to life is easier than you might think.
Whether you purchased a dehydrated starter (hopefully from me 😊) received one from a friend, or saved some of your own for long-term storage, this guide will walk you through the process of reactivating your starter and getting it ready for baking.
Quick Answer
Most dehydrated sourdough starters become active within 2–5 days. To reactivate, soak the dried starter in water, then begin feeding it with equal parts flour and water every 12–24 hours. Once the starter consistently doubles in size, becomes bubbly, and develops a pleasant sour aroma, it's ready to bake with.
Why Dehydrate a Sourdough Starter?
Dehydrating a sourdough starter is one of the best ways to preserve it for long-term storage.
Benefits include:
Shelf-stable storage
Easy shipping and gifting
Backup protection if something happens to your active starter
Convenient travel option for sourdough bakers
A properly dehydrated starter can remain viable for months—and often years—when stored in a cool, dry place.
What You'll Need
My Recommended Sourdough Tools
A good scale and clear jar make sourdough baking much easier.
👉 Shop my favorite sourdough tools here:
Step 1: Rehydrate and Feed
Place 10g dehydrated starter into a clean jar.
Add:
50g warm water
50g flour
Cover loosely and place in a warm location between 72°F and 78°F.
Step 2: Wait and Observe
For the first 24 hours, you may not see much activity. This is completely normal.
The wild yeast and beneficial bacteria are waking up after being dormant.
You may notice:
Small bubbles
A slightly tangy aroma
Minor growth
Don't be discouraged if the starter appears inactive at first.
Step 3: Continue Feeding
Every 12–24 hours:
Discard all but 50g starter.
Feed with:
50g water
50g flour
Continue this feeding schedule until the starter becomes predictably active.
Step 4: Watch for Signs of Readiness
Your starter is ready to bake when it:
✅ Doubles in size after feeding
✅ Has bubbles throughout the jar
✅ Smells pleasantly sour
✅ Rises and falls predictably
✅ Remains active for several consecutive feedings
Troubleshooting: My Starter Isn't Waking Up
It's been 24 hours and nothing is happening.
Be patient. Many dehydrated starters need several feedings before becoming active.
It's been 48 hours with very little activity.
Try:
Moving the starter to a warmer location
Feeding with whole wheat flour
Feeding with rye flour
Extending the reactivation process another day or two
It's cold in my house.
Temperature plays a huge role in starter activity. A proofing box, dough thermometer, or warming mat can help maintain consistent conditions.
My starter smells strange.
A slightly sour aroma is normal.
If you notice mold, pink streaks, orange discoloration, or a rotten smell, discard the starter and begin again.
My starter rises a little but not much.
Continue feeding consistently. Many starters strengthen significantly between days 3 and 5.
Frequently Asked Questions
How long does it take to reactivate a dehydrated sourdough starter?
Most starters become active within 2–5 days, although older dehydrated starters may take slightly longer.
Can I bake with it immediately after rehydrating?
No. The starter should be fully active and consistently doubling in size before using it in a recipe.
What flour should I use?
Bread flour, all-purpose flour, whole wheat flour, or rye flour all work well. Rye and whole wheat often encourage faster activity.
Should I use warm or cold water?
Warm water is typically best during reactivation because it encourages yeast activity.
How old can dehydrated starter be?
When properly stored, dehydrated starter can remain viable for years. It may simply require additional feedings to regain full strength.
Does my starter need to pass the float test?
Not necessarily. Consistent growth, bubbling, and doubling are more reliable indicators of readiness.
Ready to Bake?
Once your starter is active, bubbly, and consistently doubling in size, you're ready to begin making sourdough bread.
If you're new to sourdough baking, be sure to check out my beginner sourdough resources and in-person sourdough classes designed to help you build confidence and create beautiful artisan loaves at home.
You can also browse my other sourdough tutorials, including:
Happy baking!
JennyBread and More
About the Baker
Hi, I'm Jenny, the baker behind Bread and More. I run a small microbakery where I bake sourdough breads, bagels, and baked goods for my community.
Here on the blog I share sourdough tips, baking lessons I've learned along the way, and simple guidance to help home bakers feel more confident baking sourdough.
Great starter and easy to follow instructions. I rehydrated mine about 5 days ago and today it finally seems ready to bake !