How to Rehydrate a Dried Sourdough Starter
There is something quietly remarkable about bringing a dried sourdough starter back to life. What appears still is only resting. The wild yeast and beneficial bacteria are simply waiting for warmth, water, and flour to awaken them.
At Great Lakes Sourdough, here in Kingston on the shores of Lake Ontario, each starter is carefully cultivated using Canadian flour, then gently dehydrated at peak strength. When you revive it, you are continuing a living tradition. Within days, your starter will bubble, rise, and breathe again, ready to bake beautiful sourdough bread in your own kitchen.
Step 1: Rehydrate Your Dried Sourdough Starter
Empty the full 15-gram package of dehydrated sourdough starter into a clean glass jar.
Add 15 grams of filtered, tepid water and let it sit for 5 minutes so the starter can absorb the moisture and begin reactivating.
Then add:
- 15 grams of flour
Use the flour blend that matches your starter:
- Classic White Starter: 90% bread flour and 10% rye flour
- Rye Starter: 100% rye flour
- Whole Wheat Starter: 100% whole wheat flour
Mix until all the flour and starter are incorporated. You may add a small amount of additional water if the mixture is overly thick, but the first reactivation feed is intentionally kept at a low hydration. Cover loosely and place in a warm area around 24°C (75°F).
Step 2: Feed After 24 Hours
After 24 hours, you may begin to see bubbles or notice a gentle sour aroma. If you do not, be patient. Some starters wake more slowly.
Discard half of the starter, then feed with:
- 45 grams of water
- 45 grams of flour
Cover loosely and return it to its warm place.
Step 3: Continue Feeding Until Active
Continue feeding every 24 hours:
- Discard half of the starter.
- Feed 15 grams of water and 15 grams of flour.
Your starter is ready when it reliably doubles in volume within 4 to 6 hours after feeding. This usually happens between day 3 and day 5.
At this stage, your starter is fully revived and ready to bake sourdough bread, pizza dough, bagels, and more.
Why Dehydrate a Sourdough Starter?
- Long-term preservation without feeding
- Reliable backup in case of loss
- Easy sharing and shipping
- Convenient storage for future baking
The Science Behind Rehydration
When dehydrated, the yeast and bacteria enter dormancy. Adding water and flour reactivates them, allowing fermentation to resume. This natural process produces the gases and acids that give sourdough bread its rise, flavour, and character.
From the Shores of Lake Ontario to Your Kitchen
Every Great Lakes Sourdough starter is cultivated in Kingston, Ontario, using Canadian flour. When you revive your starter, you become part of that living lineage, one jar, one loaf, one kitchen at a time.
Ready to start your sourdough journey?
Explore our collection of dehydrated sourdough starters made with organic Canadian flour.
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