When to plant bell peppers in Sion: 28 June – 29 June

In Sion, bell pepper: sow for seedlings from 8 April to 30 April; plant into a greenhouse from 7 June to 29 June; plant out into open ground from 28 June to 29 June. For plants and seeds, the places nearby include Agrol (garden centre, 13 km); addresses and opening hours are below.

Bell Pepper in Sion: soil, season and weather

In Sion the soil, not frost, sets the date: the last frost is over around 8 May, but the top 7 cm of soil reaches 18 °C — the minimum on the bell pepper card — only around 28 June, 51 days later. 113 days separate planting out (28 June) from the first autumn frost (19 October); the card's 70 days to the first harvest leave 43 for picking, so a start 6 weeks late would still fit.

Last spring frost	8 May
Top 7 cm of soil at 18 °C	28 June, 51 days after the last frost
Into an unheated greenhouse	7 June – 29 June; June outside: 9.5 °C at night, 20.2 °C by day; card 15–30 °C
First autumn frost	19 October, 113 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	6 September – 7 September
Days left for picking	43
Daylight	14:14 on 29 April, 15:46 on 28 June
Watering outdoors when fruiting (card)	every 4 days; the driest month, September, has 12 rainy days

The same dates in Sion hold for Cucumber, Eggplant, Zucchini, Pumpkin and Watermelon.

Bell Pepper in Sion: care after planting

Planted on 28 June: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

28 June — feed: balanced (NPK)
26 July — feed: nitrogen

Pests and diseases of bell pepper to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Sion during the bell pepper season

No month of the season averages above the bell pepper card's 15–30 °C by day; the warmest, August, averages 22 °C. Months that stay below 15 °C even by day on average: October (13.7 °C). Nights average below 15 °C in every month of the season, from 2.9 °C to 11.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.2	9.5	125	18	15:46
July	21.8	11.1	115	16	15:27
August	22	10.8	103	14	14:12
September	17.7	7.1	91	12	12:36
October	13.7	2.9	105	12	10:59

ERA5 2016–2025, Open-Meteo

Bell Pepper in nearby cities

Around Sion, Neuchâtel is 22 days earlier and Aosta 3 days later.

City	Distance	Date	Difference
Aosta	55 km	1 July – 2 July	3 days later
Lausanne	65 km	19 June – 31 July	9 days earlier
Fribourg	65 km	21 June – 17 July	7 days earlier
Bern	80 km	21 June – 14 July	7 days earlier
Neuchâtel	91 km	6 June – 8 August	22 days earlier
Geneva	94 km	8 June – 28 July	20 days earlier

Where to buy bell pepper plants and seeds near Sion

Buy plants ready to set out from 28 June to 29 June (from 7 June to 29 June for an unheated greenhouse); seed for raising your own is sown from 8 April to 30 April. 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).

Point Vert — garden centre
5 km
Lehmann Plantes — plant nursery
3 km · lehmannplantes.ch
K. Brandalise — farm supply
9 km
Agrol — garden centre
Route de Sion 90, 3960 Sierre · Mon–Thu 08:00–18:30; Fri 08:00–20:00; Sat 08:00–17:00 · 13 km · agrol.ch

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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