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

In Aosta, crocus: 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).

Crocus 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 Hyacinth.

Crocus in Aosta: 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 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 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

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

All the nearest cities on our list plant crocus 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 crocus 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 crocuses in Aosta?

In Aosta, crocus: 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