When to plant cucumbers in St. Gallen: 15 June – 3 September

In St. Gallen, cucumber: sow for seedlings from 27 April to 6 August; plant into a greenhouse from 25 May to 3 September; plant out into open ground from 15 June to 3 September. For plants and seeds, the places nearby include R. Sager AG (garden centre, 10 km) and Landi (farm supply, 10 km); addresses and opening hours are below.

Cucumber in St. Gallen: soil, season and weather

In St. Gallen the soil, not frost, sets the date: the last frost is over around 14 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 15 June, 62 days later.

Last spring frost	14 April
Top 7 cm of soil at 18 °C	15 June, 62 days after the last frost
Into an unheated greenhouse	25 May – 3 September; May outside: 8.4 °C at night, 17.2 °C by day; card 18–25 °C
First autumn frost	18 November, 156 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	19 July – 7 October
Days left for picking	122
Daylight	15:13 on 18 May, 15:56 on 15 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, November, has 13 rainy days

The same dates in St. Gallen hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in St. Gallen: care after planting

Planted on 15 June: in the first weeks water every 4 days.

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

22 June — feed: nitrogen

Pests and diseases of cucumber 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 St. Gallen during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 23.7 °C. Months that stay below 18 °C even by day on average: October (14.5 °C) and November (7.9 °C). Nights average below 18 °C in every month of the season, from 2 °C to 14.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.7	13.4	131	15	15:56
July	23.7	14.9	130	16	15:36
August	23.5	14.8	155	13	14:18
September	19.1	11.1	108	12	12:37
October	14.5	7.2	98	12	10:56
November	7.9	2	89	13	9:21

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around St. Gallen, Locarno is 16 days earlier and Lucerne 13 days later.

City	Distance	Date	Difference
Zurich	63 km	11 June – 1 September	4 days earlier
Lucerne	90 km	28 June – 5 August	13 days later
Freiburg im Breisgau	130 km	4 June – 1 September	11 days earlier
Basel	135 km	5 June – 5 September	10 days earlier
Bellinzona	139 km	19 June – 31 August	4 days later
Locarno	146 km	30 May – 8 July	16 days earlier

Where to buy cucumber plants and seeds near St. Gallen

Buy plants ready to set out from 15 June to 3 September (from 25 May to 3 September for an unheated greenhouse); seed for raising your own is sown from 27 April to 6 August. Within 15 km of St. Gallen OpenStreetMap lists 7 garden centres, 3 farm-supply shops, 1 plant nursery, 3 markets and 24 farm shops (collected 27 October 2026).

R. Sager AG — garden centre
Gontenstrasse 47, 9108 Gontenbad · 10 km
Landi Säntis — garden centre
Herisauerstrasse 28, 9107 Urnäsch · 13 km
Landi — farm supply
Mettlenstrasse 10, 9050 Appenzell · Mon–Fri 08:00–18:30; Sat 08:00–17:00 · 10 km · landi.ch
Landi Altstätten — farm supply
Oberrieterstrasse 87, 9450 Altstätten SG · Mon–Fri 08:00–18:30; Sat 08:00–16:00 · 15 km · landialtstaetten.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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