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When to plant hyacinths in Aosta: 11 August – 22 October

In Aosta, hyacinth: plant from 11 August to about 22 October. For planting stock, the places nearby include Agricenter (garden centre, 3 km); addresses and opening hours are below.

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 Aosta: soil, season and weather

Nights then average below 0 °C in November–May; the coldest, January, averages -11.9 °C.

Planting11 August – 22 October
First autumn frost10 September
Coldest nightsJanuary, -11.9 °C
Soil back at 1 °C in spring6 May
Daylight14:21 on 11 August
Daylight at the winter solstice8:40

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

Hyacinth in Aosta: 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 Aosta the average daily temperature stays at 10 °C or lower for about 40 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

All the nearest cities on our list plant hyacinth later than Aosta; the closest date is in Sion, 39 days later.

CityDistanceDateDifference
Sion55 km19 September – 19 November39 days later
Turin80 km21 October – end of December71 days later
Annecy94 km15 October – end of December65 days later
Geneva105 km18 October – end of December68 days later
Novara106 km23 October – end of December73 days later
Fribourg119 km7 October – 30 December57 days later

Where to buy hyacinth for planting in Aosta

Planting stock goes into the ground from 11 August to about 22 October; buy it before that. Within 15 km of Aosta OpenStreetMap lists 4 garden centres, 2 markets and 2 farm shops (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Aosta?

In Aosta, hyacinth: plant from 11 August to about 22 October. 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.

When is the last spring frost in Aosta?

Last spring frost around 6 June, first autumn frost around 10 September.

Other crops in Aosta, with their dates