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Make a homemade sourdough starter with just flour and water using this simple recipe. Perfect for beginners, this method creates a strong, bubbly starter in 5–7 days that’s ideal for baking artisan sourdough bread, pizza dough, pancakes, and more. With easy feeding instructions, tips for storage, and guidance for testing readiness, this sourdough starter recipe helps you build a healthy, active culture for all your baking needs.

Ingredients

100 g whole grain rye flour or whole wheat flour (preferably organic) – about ¾ cup
500 g all-purpose flour (preferably organic, unbleached) – used to feed and maintain the starter
1 quart filtered or spring water, room temperature

Instructions

Day 1 – Create Your Starter

Weigh and record the weight of your clean glass jar before adding anything. Label it with the date for easier tracking.
Add 100 g (¾ cup) whole wheat or rye flour and 100 g (½ cup) water. Mix well with a fork until thick. Scrape down the sides with a spatula.
Cover with a loose-fitting lid and let it rest at room temperature for 24 hours.
Place a rubber band around the jar to mark the level of the starter for tracking growth.

Day 2 – Resting Stage

Don’t worry if there are no visible changes yet. Some tiny bubbles may appear, or it may look the same. Let it rest another 24 hours.

Day 3 – First Signs of Activity

Discard half of the starter (do not pour down the sink). You should have 100 g starter left.
Feed with 100 g (¾ cup) all-purpose flour and 100 g (½ cup) water. Stir, scrape the sides, cover loosely, and rest for 24 hours.

Day 4 – More Bubbles Appear

Discard all but 100 g starter.
Feed with 100 g flour and 100 g water (same as before).
Cover loosely and rest for 24 hours.
Note: If growth slows down, don’t worry—just keep feeding, and it will recover.

Day 5 – Active Growth

Repeat the process: discard all but 100 g starter, feed with 100 g flour and 100 g water, then rest for 24 hours.

Day 6–7 – Strong, Active Starter

By now, your starter should double or more in size. Continue discarding down to 100 g and feeding the same ratio daily until it reliably doubles within 4–6 hours of feeding.

Testing Your Starter

A mature starter should:
- Double in size within 4–6 hours of feeding
- Smell pleasantly sour
- Pass the float test: drop a spoonful into water—if it floats, it’s ready for baking.

If your starter isn’t strong by day 7, keep feeding daily. The process may take longer depending on your flour, water, and kitchen temperature.

Maintaining Your Starter

For frequent bakers: Keep at room temperature and feed every 24 hours. Before baking, feed the starter and wait until it peaks (4–6 hours), then use the portion needed.
For occasional bakers: Store in the fridge. Feed once a week—discard down to 100 g, add fresh flour and water, let rest at room temp for 1–2 hours, then refrigerate. Before baking, bring it out the night before, feed, and use at peak.

Why You’ll Love This Recipe

Creates a strong, bubbly sourdough starter from scratch
Uses simple, natural ingredients – flour and water
Works with both whole wheat or rye flour and all-purpose flour
Provides a reliable step-by-step method for beginners

Tips

Use unbleached, organic flour for the healthiest starter.
Always use filtered or spring water—chlorinated tap water can slow growth.
Keep your jar in a warm, draft-free spot (70–75°F is ideal).
Always discard part of the starter before feeding—it keeps acidity in balance.

Variations and Substitutions

Flour options: Start with rye or whole wheat for faster fermentation, then maintain with all-purpose.
Hydration: This recipe uses equal parts flour and water by weight (100% hydration). Adjust slightly if using different flours.
Gluten-free option: Use certified gluten-free flours such as brown rice flour or sorghum.

FAQs

Q: How long does it take to make a sourdough starter?
A: Usually 5–7 days, but sometimes up to 10 depending on your environment.

Q: Why do I have to discard starter?
A: Discarding prevents your starter from becoming too large and keeps acidity levels balanced for healthy yeast growth.

Q: What if my starter smells weird?
A: A tangy or slightly fruity smell is normal. If it smells rotten or mold develops, discard and restart.

Q: Can I switch flours during the process?
A: Yes. Many bakers start with rye or whole wheat for faster activity, then transition to all-purpose flour for maintenance.

Serving and Suggestions

Use your active sourdough starter to bake classic sourdough bread, pizza dough, pancakes, waffles, crackers, or bagels.
Save discard for recipes like banana bread, muffins, quick breads, or even savory crackers.