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When to plant garlic in San Juan: 21 May – end of June

In San Juan, garlic: plant from 21 May to the end of June.

Garlic is best planted early in the window: cloves planted late make smaller bulbs. Late planting works only while the soil is not frozen. Mulch after planting.

The average daily temperature here stays above 0 °C all winter, and at least two months average 10 °C or less: the cold garlic needs, one to two months at 0–10 °C (RHS). The two-month threshold is our rule of thumb. Sources: UVM Extension, UNH Extension, RHS.

Garlic in San Juan: soil, season and weather

Garlic goes into the ground in San Juan from 21 May to the end of June; the window opens a month before the first autumn frost. No month averages below 0 °C at night; the coldest nights, in July, average 3 °C.

Planting21 May – end of June
First autumn frost20 June
Coldest nightsJuly, 3 °C
Soil back at 5 °C in springalready in the first week of July
Harvest (card)about 8 months after planting: January
Daylight10:25 on 21 May
Daylight at the winter solstice10:05

The same dates in San Juan hold for Tulip, Daffodil, Crocus and Hyacinth.

Garlic in San Juan: care after planting

Planted on 21 May: in the first weeks water every 7 days.

Feeding, by the card’s schedule from that day:

  • 21 May — feed: nitrogen
  • 18 June — feed: nitrogen

Pests and diseases of garlic to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Garlic in nearby cities

Around San Juan, La Serena is 50 days earlier and San Luis 3 days later.

CityDistanceDateDifference
Mendoza153 km18 May – end of June3 days earlier
San Luis284 km24 May – end of June3 days later
La Rioja286 kmby 16 May5 days earlier
Santiago292 kmby 19 May2 days earlier
La Serena317 km1 April50 days earlier
Valparaíso335 km1 April50 days earlier

Where to buy garlic for planting in San Juan

Planting stock goes into the ground from 21 May to the end of June; buy it before that. Within 15 km of San Juan OpenStreetMap lists 9 garden centres, 5 farm-supply shops, 3 plant nurseries and 6 markets (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant garlic in San Juan?

In San Juan, garlic: plant from 21 May to the end of June. Garlic is best planted early in the window: cloves planted late make smaller bulbs. Late planting works only while the soil is not frozen. Mulch after planting.

When is the last spring frost in San Juan?

Last spring frost around 27 July, first autumn frost around 20 June.

Other crops in San Juan, with their dates