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When to plant daffodils in Sion: 19 September – 19 November

In Sion, daffodil: plant from 19 September to about 19 November. For planting stock, the places nearby include Ferme Vuissoz (farm shop, 2 km) and bioverger.ch (farm shop, 4 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 Sion: soil, season and weather

Nights then average below 0 °C in November–April; the coldest, January, averages -7.3 °C.

Planting19 September – 19 November
First autumn frost19 October
Coldest nightsJanuary, -7.3 °C
Soil back at 7 °C in spring14 April
Daylight12:23 on 19 September
Daylight at the winter solstice8:37

The same dates in Sion hold for Garlic, Tulip, Crocus and Hyacinth.

Daffodil in Sion: 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, 19 September.

In Sion the average daily temperature stays at 10 °C or lower for about 33 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 Sion, Aosta is 39 days earlier and Neuchâtel 40 days later.

CityDistanceDateDifference
Aosta55 km11 August – 22 October39 days earlier
Fribourg65 km7 October – 30 December18 days later
Bern80 km4 October – 21 December15 days later
Neuchâtel91 km29 October – end of December40 days later
Geneva94 km18 October – end of December29 days later
Annecy101 km15 October – end of December26 days later

Where to buy daffodil for planting in Sion

Planting stock goes into the ground from 19 September to about 19 November; buy it before that. Within 15 km of Sion OpenStreetMap lists 4 garden centres, 1 farm-supply shop, 1 plant nursery, 1 market and 4 farm shops (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant daffodils in Sion?

In Sion, daffodil: plant from 19 September to about 19 November. 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 Sion?

Last spring frost around 8 May, first autumn frost around 19 October.

Other crops in Sion, with their dates