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Rye Sourdough Starter

AT

By

Ago Tanfossi

Chef and recipe curator at Global Cucina

Published on July 19, 2026

Updated on July 19, 2026

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A beginner-friendly rye sourdough starter built through four warm fermentation stages, then maintained with regular refrigerator feedings.

A dependable starter comes from clean tools, steady warmth, and watching fermentation rather than following the clock alone.

60 hr 25 min
1 servings
Capolavoro Score 4.9/5 · 283 votes
Rye Sourdough Starter

Ingredients

Stage 1

  • 50 g rye flour
  • 50 g Water

Stage 2

  • 50 g rye flour
  • 50 g Water
  • 100 g sourdough starter

Stage 3

  • 50 g rye flour
  • 50 g Water
  • 50 g sourdough starter

Stage 4

  • 50 g rye flour
  • 50 g Water
  • 10 g sourdough starter

Equipment

  • mason jar

Instructions

  1. 1

    For Stage 1, vigorously mix 50 g rye flour with 50 g warm water in a large clean preserving jar. Add up to 10 g more water only if extremely stiff. Rest the lid loosely on top and ferment at 25-30°C/77-86°F for 20-24 hours.

    24 hr

  2. 2

    For Stage 2, mix the entire starter with 50 g rye flour and 50-60 g warm water. Cover loosely and ferment at 25-30°C/77-86°F for 8-15 hours. Continue when it has doubled and is just beginning to recede.

    15 hr

  3. 3

    For Stage 3, retain 50 g starter and discard the remainder. Mix with 50 g rye flour and 50-60 g warm water. Cover loosely and ferment at 25-30°C/77-86°F for about 12 hours, until doubled and beginning to recede.

    12 hr

  4. 4

    For Stage 4, retain 10 g starter and discard the remainder. Mix with 50 g rye flour and 50-60 g warm water. Cover loosely and ferment at 25-30°C/77-86°F for 8-12 hours; it should rise by at least half.

    12 hr

  5. 5

    When the starter smells distinctly sour and shows activity, about 110 g is ready for baking. Otherwise repeat Stage 4. Depending on the bread recipe, about 75 g may be used for 500 g flour; very young starter may need yeast added to the bread dough until it grows stronger.

  6. 6

    Store the remaining starter in a small clean jar with a loosely fitted lid in the refrigerator. Every 7-10 days, transfer 10 g to a fresh jar and feed with 50 g rye flour and 50 g water.

  7. 7

    Let the refreshed starter ferment at 25-30°C/77-86°F for 6-12 hours. Remove the amount needed for baking and refrigerate the remainder again.

    12 hr

Ago's Notes

  • Work cleanly and use thoroughly washed jars and spoons. Discard the entire starter and begin again if you see mold or unusual colors.
  • The times are guides: volume, bubbles, and aroma determine when to continue. Cover the jar loosely and never seal it airtight during fermentation.
  • A sharp acetone-like smell can indicate a hungry starter; visible mold or abnormal coloration is different and requires disposal.

With regular feedings, the young starter becomes increasingly vigorous and can support sourdough baking for years.

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