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When to plant hyacinths in San Juan: by 21 May

In San Juan, hyacinth: 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 INSEMI (plant nursery, 8 km); addresses and opening hours are below.

Hyacinth 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 Crocus.

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

Plant hyacinths 10 cm deep, at least 7.5 cm apart (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 12–15 weeks at about 2–10 °C. That is less than the bulbs need, and without more cold they may not flower properly. Where winters are not cold enough for long enough, LSU AgCenter keeps tulip and hyacinth bulbs in the refrigerator for at least six to eight weeks before planting, and plants them only once the soil has cooled: warm soil can cancel the chilling. Keep fruit out of that refrigerator — ripening fruit gives off ethylene, which harms the flowers (Wisconsin Horticulture Extension).

Flowers get smaller in the years after planting: for full spikes, replace the bulbs or add a few new ones each autumn (RHS).

If squirrels are a problem, protect the bulbs with wire mesh (RHS). Hyacinths are toxic to dogs, cats and horses: intense vomiting and diarrhoea (ASPCA).

Sources: RHS, Wisconsin Horticulture Extension, LSU AgCenter, ASPCA.

Hyacinth 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 hyacinth 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 hyacinths in San Juan?

In San Juan, hyacinth: 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