When to plant hyacinths in Ushuaia: 27 December – 18 May

In Ushuaia, hyacinth: plant from 27 December to about 18 May.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Hyacinth in Ushuaia: soil, season and weather

Nights then average below 0 °C in May–September; the coldest, July, averages -4.1 °C.

Planting	27 December – 18 May
First autumn frost	26 January
Coldest nights	July, -4.1 °C
Soil back at 1 °C in spring	28 September
Daylight	17:18 on 27 December
Daylight at the winter solstice	7:12

The same dates in Ushuaia hold for Garlic, Tulip, Daffodil and Crocus.

Hyacinth in Ushuaia: depth, winter cold, pests and pets

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS). In the ground hyacinths are fully hardy, but in containers they can be frost tender in cold winters (RHS); here winter nights average below 0 °C, so wrap the pots or move them to a sheltered spot.

In Ushuaia the average daily temperature stays at 10 °C or lower for about 52 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. The winter here gives that in the ground, so the bulbs need no pre-chilling.

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, ASPCA.

Hyacinth in nearby cities

Around Ushuaia, Coyhaique is 12 days earlier and Puerto Montt 131 days later.

City	Distance	Date	Difference
Punta Arenas	250 km	8 March – end of June	71 days later
Río Gallegos	360 km	7 March – end of June	70 days later
Comodoro Rivadavia	997 km	by 24 April	118 days later
Coyhaique	1,061 km	15 December – 25 May	12 days earlier
Trelew	1,304 km	by 29 April	123 days later
Puerto Montt	1,522 km	by 7 May	131 days later

Where to buy hyacinth for planting in Ushuaia

Planting stock goes into the ground from 27 December to about 18 May; buy it before that. Within 15 km of Ushuaia OpenStreetMap lists 3 markets (collected 27 October 2026).

Mar de Cobos — market
2 km
Champita — market
2 km
Mercado De la Costa — market
6 km

Questions