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When to plant crocuses in San Juan: by 21 May

In San Juan, crocus: plant by 21 May. The winter here is too mild for our late-planting rule, so we give no later limit. For planting stock, the places nearby include Vivero Regalería Verde (garden centre, 2 km) and Vivero Yamanouchi (garden centre, 2 km); addresses and opening hours are below.

Crocus in San Juan: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in July, average 3 °C.

Plantingby 21 May
First autumn frost20 June
Coldest nightsJuly, 3 °C
Soil back at 1 °C in springalready in the first week of July
Daylight10:25 on 21 May
Daylight at the winter solstice10:05

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

Crocus in San Juan: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In San Juan the average daily temperature stays at 10 °C or lower for about 6 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. That is less than the bulbs need, and without more cold they may not flower properly. The cold can also be given in a refrigerator at about 2–7 °C, as Wisconsin Horticulture Extension does for crocuses forced in pots.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

Around San Juan, San Rafael is 15 days earlier and San Luis 3 days later.

CityDistanceDateDifference
Mendoza153 kmby 18 May3 days earlier
San Luis284 kmby 24 May3 days later
San Rafael343 kmby 6 May15 days earlier
Rancagua358 kmby 13 May8 days earlier
Curicó459 kmby 8 May13 days earlier
Talca519 kmby 14 May7 days earlier

Where to buy crocus for planting in San Juan

Planting stock goes into the ground by 21 May; 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 crocuses in San Juan?

In San Juan, crocus: plant by 21 May. The winter here is too mild for our late-planting rule, so we give no later limit.

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