Create a Sourdough Starter – Step-by-Step for Beginners

A clear, practical guide to building a healthy sourdough starter from scratch. Feed, maintain and troubleshoot with science-backed tips.

What to Expect

This guide will get you a healthy, active sourdough starter within 5–10 days that can leaven bread. You'll learn predictable feeding, how to read activity, and how to store the starter long term.

What you'll learn:

  • ✓ How microbial activity looks and smells in a starter
  • ✓ How to feed with reliable ratios and timing
  • ✓ How to tell when the starter is ready to bake with

💭 Expect some variation by environment — warm kitchens accelerate activity, cool ones slow it. Most starters are ready between days 5–10; patience and consistent feeds win.

What You Need

Must have:

Digital Kitchen Scale

Accurate to ±1 g for consistent feeding

⚠️ Buy one before starting → more

Glass Jar for Starter

Clear, straight-sided jar ~500–1000 ml

⚠️ Any clean, non-reactive container will do, but transparency helps track rise → more

Flour (unbleached bread or whole wheat/rye)

Use single-origin if possible; whole grain speeds fermentation

⚠️ Buy fresh flour; old flour gives weak activity

Nice to have:

Why this method works:

Weight-based feeding (not volume)

Grams give reproducible food-to-starter ratios so yeast and bacteria develop predictably [1][2]

Start with small inoculum and increase

Avoids rapid acid build-up that can stall activity; gradual increases encourage a balanced culture [1]

Use whole-grain early

Whole grains provide more nutrients and native microbes to kick-start fermentation, then you can switch to white flour if desired [2]

Observe, don't follow the clock blindly

Temperature and flour change timing — learn to read rise, bubbles and aroma to judge readiness [1]

Ingredients

For: One maintained starter (about 200–400 g)

Whole wheat or rye flour 50g (day 1) Provides nutrients to jump-start activity
Unbleached bread flour as needed for subsequent feeds Can be mixed with whole grain at later feeds
Water equal weight to flour (e.g., 50g) Use filtered or bottled if tap is heavily chlorinated; 75°F/24°C speeds activity

Step by Step

Feed twice daily using weight ratios, watch for doubling and bubbles, then switch to regular maintenance.

1

Day 1: Mix first culture (10 min)

Morning

Combine 50g [whole wheat or rye flour] with 50g water in a glass jar for starter. Stir with a jar spatula or dough whisk until smooth. Mark level with a rubber band.

✓ No dry flour; mixture viscous like thick pancake batter
💡 Room temperature 70–75°F (21–24°C) is ideal; warmer speeds it up [1]
2

Day 2–3: First feeds (5 min each, twice daily)

Morning and evening (~12 hours apart)

Discard half the jar (or remove to separate container) and feed with 50g flour + 50g water each time (1:1:1 by weight - starter:flour:water). Stir and mark.

✓ Small bubbles appear; mild yeasty aroma
💡 If nothing visible by day 3, continue the same routine — sometimes microbes need extra time [2]
3

Day 4–6: Increase activity and switch to daily schedule

As activity increases

When you see consistent bubbling and rise, switch to feeding ratio 1:2:2 (e.g., 50g starter : 100g flour : 100g water) to build strength. Feed twice daily until starter reliably doubles in 4–8 hours.

✓ Starter doubles in volume and has many bubbles; aroma is pleasantly tangy, not harsh
💡 Use a digital kitchen scale for accurate ratios [1]
4

Float test (optional but informative)

When you think starter is ready

Drop a spoonful of starter into a glass of room-temperature water; if it floats, it likely has enough gas to leaven bread.

✓ Floats within a few seconds
⚠️ Float test isn't 100% reliable — combine with rise/doubling and aroma assessments [1]
5

Maintenance: fridge or room temp

After established

For daily baking: leave at room temperature and feed once or twice a day. For occasional baking: refrigerate and feed weekly. Before baking, refresh with 1–2 feeds at room temp to build strength.

✓ Starter rises predictably after a feed
💡 When refrigerating, feed, let it peak, then refrigerate to avoid starvation [2]
6

Scaling up for a bake

Day of baking

Build a levain by mixing a portion of mature starter with flour and water (e.g., 20g starter : 100g flour : 100g water) and let it become active before mixing dough.

✓ Levain doubles and is aerated with a pleasant, slightly sweet-sour aroma
→ Erstes Sauerteigbrot

What If It Doesn't Work?

Common issues during starter build and what to do:

No bubbles after several days

Likely: Low temperature or weak flour

Fix: Move to a warmer spot (75°F/24°C), use some whole grain flour, ensure fresh flour

→ More info

Hooch (liquid on top)

Likely: Starter hungry or refrigerated too long

Fix: Pour off or stir back in, then feed. If refrigerated, bring to room temp and refresh with frequent feeds

→ More info

Unpleasant rotten smell

Likely: Contamination or extreme acidification

Fix: Discard most, keep a spoonful, switch to whole-grain feeds and warmer temps; if mold appears, start over

→ More info

Starter very sour and sluggish

Likely: Too long between feeds or too low inoculation

Fix: Increase feed ratio (more fresh flour) and feed more often until activity resumes

💪 Most problems are fixable with consistent feeds and temperature control. Observing patterns teaches you faster than strict schedules.

What now?

Starter is active and doubles reliably
→ Use it to make your first loaf
You want to understand the microbiology
→ Read about what a starter contains and how it works
You want reasons to prefer sourdough
→ Learn the benefits of sourdough baking
You need regular feeding tips
→ See practical maintenance schedules

Sources

  1. [1]
    The Perfect Loaf – The Perfect Loaf – Link
  2. [2]
    Plötzblog – Plötzblog – Link