Sourdough Starter — From Scratch

A wild-yeast sourdough starter you grow yourself from just flour and water. No store-bought yeast or packets needed — you're capturing the wild yeast and bacteria already living on the flour and in your kitchen. Takes about 7 days to get bubbly and bake-ready (sometimes 10–14 in cold kitchens).

Yield: One active starter you keep alive indefinitely Active time: ~5 min/day Total to first bake: 7–14 days

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Ingredients

• Flour: 60g per feeding — unbleached all-purpose works, but whole wheat or rye kickstarts it faster (more wild yeast + nutrients). Best combo: start with rye/whole wheat for the first few days, then transition to all-purpose or bread flour.
• Water: 60g per feeding — filtered or dechlorinated. Chlorine in tap water can stunt the yeast. If your tap water inhibits activity, use filtered water; standing does not remove every disinfectant, including chloramine.

Equipment

• A clear glass jar or container (1 qt / ~1L), loosely covered (lid resting on top, NOT sealed airtight — it needs to breathe and will produce gas)
• Kitchen scale (strongly recommended — sourdough is a ratio game; volume measuring is unreliable)
• A spoon or small spatula
• A rubber band or marker to mark the jar level

No scale? Rough volume equivalents: 1/2 cup flour ≈ 60g, 1/4 cup water ≈ 60g. But get a scale if you can — it makes everything consistent.

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Instructions

The whole game is: feed it equal parts flour and water by weight, every day, and discard most of it before each feeding. The discard prevents it from overflowing and keeps the food-to-microbe ratio healthy.

Step 1: Day 1 — Mix

In your jar, combine 60g whole wheat or rye flour + 60g water (room temp).

• Stir into a thick paste, scrape down the sides.
• Mark the level with a rubber band. Cover loosely.
• Leave somewhere warm (70–78°F / 21–25°C is ideal — a warm cupboard, or an off oven only if checked to stay within that range).

Step 2: Days 2–3 — First feedings

You may see a few bubbles, or nothing yet. Both are fine.

• Discard all but about 60g of the starter (eyeball ~1/4 cup; throw the early discard away; do not save it for food).
• Feed the remaining: add 60g flour + 60g water, stir, re-mark the level, cover.
• Once a day is fine for now.

Early activity is not readiness: A brief rise in the first few days does not establish a mature starter. Keep feeding, discard early excess, and throw the whole starter away if mold or pink/orange discoloration appears. Smell alone cannot establish safety.

Step 3: Days 4–6 — Twice-daily feeding

By now it should smell sour/tangy/yeasty (a good sign) and start rising more predictably.

• Switch to feeding twice a day (roughly every 12 hours) to build strength.
• Each feeding: discard down to ~60g, then add 60g flour + 60g water.
• You can now transition to all-purpose or bread flour if you started with rye/wheat.
• Watch it: it should start to roughly double in size between feedings and be full of bubbles.

Step 4: Day 7+ — Test if it's ready

Your starter is ready to bake when it reliably:

1. Doubles in size within 4–8 hours of feeding, AND
2. Is bubbly and domed on top, AND
3. Smells pleasantly sour/tangy (like yogurt or beer), not rotten.

Optional float check: A spoonful may float when it contains enough gas, but this alone does not prove maturity or safety. Use reliable rise after repeated feedings as the baking-readiness cue.

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Once It's Alive — Keeping It

Baking regularly (a few times a week):

• Keep it on the counter, feed once or twice daily as above.

Baking occasionally:

• Store it in the fridge and feed just once a week. The cold slows everything down.
• To bake: pull it out, feed it, leave on the counter, and let it wake up / get bubbly for a feeding cycle or two before using.

Hooch on an established starter: Liquid can indicate a hungry starter. Feed regularly, but discard the entire starter if there is mold or pink/orange discoloration; liquid color alone does not certify safety.

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Troubleshooting

Problem	What it means / fix
No bubbles after 3–4 days	Too cold — move somewhere warmer. Try switching to rye/whole wheat. Be patient.
Pink, orange, or fuzzy mold	❌ Throw it out and start over. Real mold = done. Do not try to salvage a moldy starter.
Smells like nail polish / acetone	It's hungry — feed it more often or use more flour per feeding.
Rises then collapses fast	It's peaking and over-fermenting — use it sooner after feeding, or feed more.
Stalled / sluggish	Feed twice daily, keep warm, switch in some whole grain flour for a boost.

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What to Do With Discard

Do not put thick discard down the drain. Discard the excess during initial establishment. Only save discard from a healthy, established starter with reliable feeding activity; refrigerate it promptly and use it within 3-4 days or freeze. Use it in fully cooked pancakes, waffles, crackers, banana bread, pizza dough or biscuits, never raw.

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Pro Tips

• Name it. Seriously — people name their starters. It builds the habit of caring for it daily. (Classic names: Clint Yeastwood, Bread Pitt, Doughy Parton.)
• Consistency beats perfection. Feeding at roughly the same times daily makes it predictable and strong.
• Warmth is the #1 accelerator. A cold kitchen is the most common reason a starter is slow. Check the actual temperature before using an off oven with its light on; never preheat it with the starter inside.
• Keep a backup. Once it's thriving, dry some out (smear thin, let dry, crumble, store in a jar) as insurance in case the live one dies.

Starter and Flour Safety

Never taste raw starter, discard or flour dough. Wash hands, jars and tools; do not use appearance or smell alone as proof of safety.

King Arthur starter guidance; contamination warning signs; raw flour guidance.