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

In Grenoble, daffodil: plant from 25 September to about 1 December. For planting stock, the places nearby include Ferme Pimprenelle (farm shop, 6 km) and Monique et Jean-Paul (farm shop, 7 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).

Daffodil 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, Tulip, Crocus and Hyacinth.

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

Plant daffodils three times the bulb’s height deep (RHS): about 13–15 cm for large bulbs, 15–20 cm apart (University of Georgia Extension). The RHS advises planting them early in autumn, ideally in September in the UK, so do not leave them late: aim for the start of the window, 25 September.

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.

Daffodils are long-lived: clumps slowly expand over the years (RHS). Leave the leaves for at least eight weeks after flowering — they feed next year’s flowers (University of Georgia Extension).

Squirrels avoid daffodils, so they can be planted among tulips to reduce losses (RHS). Daffodils are toxic to dogs, cats and horses; the bulbs are the most poisonous part, and a large amount can cause convulsions and heart rhythm problems (ASPCA).

Sources: RHS, University of Georgia Extension, Wisconsin Horticulture Extension, ASPCA.

Daffodil 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 daffodil 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 daffodils in Grenoble?

In Grenoble, daffodil: 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