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When to plant tulips in Grenoble: 25 September – 1 December

In Grenoble, tulip: plant from 25 September to about 1 December. For planting stock, the places nearby include Miellerie du Peuple Zélé (farm shop, 5 km) and La Ferme des Maquis (farm shop, 5 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).

Tulip in Grenoble: soil, season and weather

Nights then average below 0 °C in November–March; the coldest, January, averages -5.1 °C.

Planting25 September – 1 December
First autumn frost25 October
Coldest nightsJanuary, -5.1 °C
Soil back at 7 °C in spring16 April
Daylight12:04 on 25 September
Daylight at the winter solstice8:45

The same dates in Grenoble hold for Garlic, Daffodil, Crocus and Hyacinth.

Tulip in Grenoble: depth, winter cold, pests and pets

Plant tulips at a depth of two to three times the bulb’s height, at least twice the bulb’s width apart, pointed end up (RHS). Where winters are very cold, tulips benefit from deeper planting to protect them from frost penetrating the soil (RHS); here the average daily temperature drops below 0 °C in winter.

In Grenoble the average daily temperature stays at 10 °C or lower for about 31 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.

Border tulips often fail to flower in their second year if left in the ground, so many gardeners grow them for one spring and plant fresh bulbs each autumn; Darwin hybrid and Kaufmanniana tulips reflower more reliably (RHS). Soils that stay wet in summer make reflowering difficult (RHS): in Grenoble the three warmest months bring about 300 mm of rain together.

Grey squirrels often dig up tulip bulbs: lay chicken wire over the bed until the leaves appear, or plant daffodils among them, which squirrels avoid (RHS). Tulips are toxic to dogs, cats and horses, the bulb most of all (ASPCA).

Sources: RHS, Wisconsin Horticulture Extension, ASPCA.

Tulip in nearby cities

Around Grenoble, Aosta is 45 days earlier and Lyon 31 days later.

CityDistanceDateDifference
Valence70 km22 October – end of December27 days later
Annecy86 km15 October – end of December20 days later
Lyon93 km26 October – end of December31 days later
Saint-Étienne108 km18 October – end of December23 days later
Geneva117 km18 October – end of December23 days later
Aosta139 km11 August – 22 October45 days earlier

Where to buy tulip for planting in Grenoble

Planting stock goes into the ground from 25 September to about 1 December; buy it before that. Within 15 km of Grenoble OpenStreetMap lists 17 garden centres, 4 plant nurseries, 55 markets and 19 farm shops (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant tulips in Grenoble?

In Grenoble, tulip: plant from 25 September to about 1 December. 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 Grenoble?

Last spring frost around 5 May, first autumn frost around 25 October.

Other crops in Grenoble, with their dates