Seasonal Calendar

Ferment what is cheap, abundant, and at peak quality — which is to say, what is in season. This calendar maps the Northern-Hemisphere produce year to the ferments that fit it, with the canonical salt % band for each so you can go straight to a calculator. Shift the months by roughly six months for the Southern Hemisphere; the produce-to-ferment logic is identical.

By season

Season	Months (N. Hemisphere)	Peak produce	Make this	Salt % band
Spring	Mar–May	Green garlic, ramps, radish, daikon, spring onion, asparagus	Fermented radish/daikon, garlic paste, alliums in brine, quick pickles	Radish 2.0–3.0%; garlic 2.0–3.0%
Summer	Jun–Aug	Cucumbers, green beans, chilies, peppers, garlic (cured), carrots	Dill pickles, fermented green beans, hot-sauce mash, giardiniera	Cucumber 3.5–5.0%; green bean 3.0–5.0%; chili 2.0–5.0%
Autumn	Sep–Nov	Cabbage, napa, beets, carrots, daikon, late chilies, apples	Sauerkraut, kimchi, fermented beets, curtido, root medleys	Sauerkraut 1.8–2.5%; kimchi 2.0–3.0%; beet 2.0–3.0%
Winter	Dec–Feb	Citrus (lemons, limes), stored cabbage and roots, ginger	Preserved lemons, marmalade, miso (the long indoor project), ginger bug	Preserved lemon 10–20%; miso 5–13%

Why these pairings

• Spring is the allium and root window. Radish and daikon ferment fast (2.0–3.0% salt, ready in days) and green garlic makes a vivid paste. Cool spring rooms (~18 °C) are ideal for lacto. See Method: Lacto Vegetables.
• Summer is the high season for brined pickles and chilies. Cucumbers want the high end of the salt range (3.5–5.0%) because warm rooms ferment fast and cucumbers go soft easily; ferment cool and add a tannin source. Chilies become hot-sauce mash now and finish over weeks. See Method: Fermented Hot Sauce and Mushy or Soft.
• Autumn is cabbage season — the natural moment for sauerkraut and kimchi, when heads are dense and cheap and rooms are cooling toward the ideal. Beets and carrots round out root ferments. See Method: Sauerkraut and Method: Kimchi.
• Winter turns to citrus and the long, slow indoor projects. Preserved lemons cure for weeks at high salt (10–20%); miso ferments for months. A ginger bug or kombucha keeps a live culture going through the cold. See Method: Preserved Citrus and Method: Miso.

Info

Ready windows at room temperature (18–22 °C): sauerkraut 14–28 days; kimchi 3–14 days; cucumber pickles 7–21 days; hot-sauce mash 14–90 days; giardiniera 5–10 days. Warmer rooms run faster, cooler rooms slower — confirm with the Fermentation Predictor rather than the calendar.

Tip

Buy the glut. When a vegetable is at its seasonal floor price it is also at peak quality and peak microbial load — exactly when a ferment works best. A few extra kilos of cabbage in October becomes sauerkraut that lasts the winter in cold storage at 2–4 °C.

Note

Season sets availability and quality, not safety. Whatever the month, the rules are unchanged: salt by weight, full submersion, pH below 4.6, and storage cold once the ferment is done. The calendar tells you what to buy, not whether a batch is safe.

See also

• Pairing Reference — flavor combinations by ferment
• Fermentation Predictor — timeline at your room temperature
• Pickle & Ferment Designer — build a batch for any seasonal vegetable
• Method: Preserved Citrus · Method: Miso