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Vegetables ferment

Fermented dill pickles

IntermediateAlso: half-sours, brined cucumbers

Whole cucumbers fermented in a salt-and-vinegar brine with dill — NCHFP tested recipe.

Temperature
13–24 °C
NCHFP: 70–75 °F (21–24 °C) about 3–4 weeks; 55–65 °F (13–18 °C) acceptable but 5–6 weeks; avoid above 80 °F (27 °C) — too soft.
Time
3–4 weeks at 21–24 °C; 5–6 weeks at 13–18 °C
Fully fermented when the colour is even and the inside is translucent.
Salt
Follow the tested brine: ½ cup salt + ¼ cup 5% vinegar + 8 cups water per gallon
Don't change salt, vinegar or water proportions.
Acidity (safety control)
pH 4.6 or below — ideally under 4.0 before cold storage
Acid made by lactic bacteria is what keeps vegetable ferments safe; 4.6 is the regulatory boundary for acid foods. Check with pH strips (narrow range) or a calibrated meter. Smell and taste are not a safety test.

Timeline

Fermented dill pickles timeline

  1. Stage 1: Prepare & brinestart · about 1 h

    Hands-on — Trim blossom ends

  2. Stage 2: Fermentfrom 1 h · about 3 weeks

    Fermenting / waiting — 21–24 °C, skim several times a week

  3. Stage 3: Refrigeratefrom 4 weeks · keeps about 5 months

    Cold storage — 4–6 months if scum is removed

Ingredients

  • NCHFP per gallon (4 L) container: 4 lb (1.8 kg) 4-inch pickling cucumbers
  • 2 tbsp dill seed or 4–5 heads fresh or dry dill
  • ½ cup salt (canning/pickling)
  • ¼ cup vinegar (5% acidity)
  • 8 cups water
  • Optional: garlic, dried red peppers, whole pickling spices

Equipment

  • Food-grade crock or jar
  • Weight and cover

Steps

  1. Use fresh cucumbers within 24 hours of picking; wash and cut 1/16 inch off the blossom end (it holds softening enzymes).
  2. Put dill and spices in the container, add cucumbers.
  3. Dissolve the salt in the vinegar and water; pour over the cucumbers.
  4. Weigh down so everything stays under the brine; cover.
  5. Ferment at 21–24 °C for about 3–4 weeks; check several times a week and remove scum or mould promptly.
  6. Refrigerate when fully fermented (evenly olive-green throughout, no white centres).

Is it working?

  • Olive-green, translucent throughout
  • Sour, garlicky dill smell
  • Brine cloudy (normal)

Smell & texture: Clean, sour, dill and garlic; firm and crunchy.

Signs tell you it's fermenting, not that it's safe: never rely on smell or appearance alone.

Safety, mould and discard rules

Mould or yeast?

A thin, flat, white or cream film on the brine surface is usually kahm yeast: skim it off promptly, because it feeds on the acid and can raise the pH. Anything fuzzy, raised, or coloured (blue, green, black, pink, orange) is mould: discard the whole batch, including the brine. If you can't tell which it is, discard.

Storage

Refrigerate in the original brine, or can using the NCHFP process.

Shelf life: NCHFP: fully fermented pickles may be stored in their original container in the fridge for about 4 to 6 months, provided surface scum and moulds are removed regularly.

The science: what's happening

Lactic bacteria ferment the cucumbers' sugars in the brine; the small amount of vinegar in the tested recipe lowers the starting pH to help the right bacteria win. Cucumbers turn olive-green and translucent all the way through.

Organisms

  • Lactiplantibacillus plantarum, Pediococcus and other lactic acid bacteria

Troubleshooting

Hollow pickles
Cucumbers too large or too long between picking and brining; use small, fresh cucumbers.
Soft or slippery
Brine too weak, too warm, not covered, or blossom ends left on. Discard if spoiled.
White sediment
Normal: bacteria settle out (or anti-caking agents in table salt).
Shrivelled
Brine too strong or delay before brining — follow the recipe exactly.

A dish (not a ferment) gone wrong? Try Recipe Rescue.

Learn more

Sources

Guidance changes: check the source for current wording. Original text; figures quoted from the sources where stated.