When to plant zucchini in Basel: 5 June – 3 September

In Basel, zucchini: sow for seedlings from 24 April to 13 August; plant into a greenhouse from 15 May to 3 September; plant out into open ground from 5 June to 3 September. For plants and seeds, the places nearby include Earl Nussbaumer Fraises â cueillir (farm supply, 5 km); addresses and opening hours are below.

Zucchini in Basel: soil, season and weather

In Basel the soil, not frost, sets the date: the last frost is over around 5 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 5 June, 61 days later.

Last spring frost	5 April
Top 7 cm of soil at 18 °C	5 June, 61 days after the last frost
First autumn frost	20 November, 168 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	11 July – 9 October
Days left for picking	132
Daylight	15:06 on 15 May, 15:48 on 5 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 12 rainy days

The same dates in Basel hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Basel: care after planting

Planted on 5 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Basel during the zucchini season

About 614 mm of rain falls in the season; September is the driest month (86 mm) and June the wettest (118 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24	14.5	118	16	15:57
July	25.4	15.8	108	14	15:37
August	25.6	15.8	95	12	14:19
September	21.2	12.2	86	12	12:38
October	16.6	8.5	100	12	10:56
November	10	3.5	107	16	9:20

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Basel, Mulhouse is 4 days earlier and Lucerne 23 days later.

City	Distance	Date	Difference
Mulhouse	29 km	1 June – 31 August	4 days earlier
Freiburg im Breisgau	52 km	4 June – 30 August	1 day earlier
Colmar	60 km	16 June – 31 August	11 days later
Bern	69 km	21 June – 17 August	16 days later
Zurich	74 km	11 June – 30 August	6 days later
Lucerne	79 km	28 June – 3 August	23 days later

Where to buy zucchini plants and seeds near Basel

Buy plants ready to set out from 5 June to 3 September (from 15 May to 3 September for an unheated greenhouse); seed for raising your own is sown from 24 April to 13 August. Within 15 km of Basel OpenStreetMap lists 16 garden centres, 2 farm-supply shops, 2 plant nurseries, 18 markets and 125 farm shops (collected 27 October 2026).

Earl Nussbaumer Fraises â cueillir — farm supply
Schafweg · 5 km
Wochenmarkt in Efringen-Kirchen — market
Hauptstraße 26, 79588 Efringen-Kirchen · Fri 08:00–13:00 · 10 km · efringen-kirchen.de
Arleser Gmüesmärt — market
Dorfplatz, 4144 Arlesheim · Fri 09:00–11:15 · 8 km · gemuesemarkt-arlesheim.ch
Früschmärt — market
Dorfzentrum, 4147 · Sat 09:00–12:00 · 10 km · attraktivesaesch.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.

Questions