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The Ultimate Beginner’s Guide to Creating a Sourdough Starter From Scratch (7-Day Timeline)

Top-down view of a very active sourdough starter in a glass jar, showing a thick layer of large, bubbly foam.
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I am Alex, and I want to show you how to make a healthy, active sourdough starter using only flour and water. This guide provides simple, step-by-step instructions perfect for beginners to establish their own natural yeast culture for baking artisanal bread.

Ingredients

Scale
  • 100g Whole Wheat or Rye Flour (for initial days)
  • 100g Unbleached All-Purpose Flour (for later days)
  • 100g Unchlorinated Water (room temperature)

Instructions

  1. Day 1: Mix 50g of whole wheat or rye flour with 50g of room temperature water in a clean glass jar. Stir until fully combined. Cover loosely and leave at room temperature (ideally 70-75°F or 21-24°C) for 24 hours.
  2. Day 2: You may see small bubbles or nothing at all. Discard half of the mixture (about 50g). Feed the remaining starter with 50g of all-purpose flour and 50g of water. Mix well, cover loosely, and wait 24 hours.
  3. Day 3: Discard half of the starter. Feed with 50g of all-purpose flour and 50g of water. You should start seeing more consistent activity.
  4. Day 4: Discard half. Feed with 50g of all-purpose flour and 50g of water. If you see significant rising and falling, you can switch to feeding twice a day (every 12 hours).
  5. Day 5: Continue the 1:1:1 feeding ratio (discard half, feed equal parts flour and water). Look for predictable doubling in size within 6-8 hours after feeding.
  6. Day 6: If your starter consistently doubles in size and smells pleasantly tangy, it is becoming active. Continue the twice-daily feeding schedule if needed to build strength.
  7. Day 7: Your homemade sourdough culture should be bubbly and reliably active. Test for readiness: drop a small spoonful into a glass of water; if it floats, it is ready to bake with. This is your foundation for sourdough bread making.

Notes

  • Use unchlorinated water; chlorine can inhibit wild yeast growth.
  • Maintain a consistent temperature between 70°F and 75°F for best results during the initial creation process.
  • If you see dark liquid (hooch) on top, this means your starter is hungry. Pour it off or stir it in, and feed it immediately.
  • Switching to all-purpose flour after the first two days often helps create a more predictable, bubbly sourdough starter.

Nutrition

Find it online: https://purecookingjoy.com/sourdough-starter-guide-beginners/

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