When to plant zucchini in Karlsruhe: 30 May – 2 September

In Karlsruhe, zucchini: sow for seedlings from 18 April to 12 August; plant into a greenhouse from 9 May to 2 September; plant out into open ground from 30 May to 2 September. For plants and seeds, the places nearby include Weingärtner´s Garten- und Landhandel (farm supply, 11 km) and ZG Raiffeisen Agrar (farm supply, 15 km); addresses and opening hours are below.

Zucchini in Karlsruhe: soil, season and weather

In Karlsruhe 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 30 May, 55 days later.

Last spring frost	5 April
Top 7 cm of soil at 18 °C	30 May, 55 days after the last frost
First autumn frost	19 November, 173 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	5 July – 8 October
Days left for picking	137
Daylight	14:59 on 9 May, 15:51 on 30 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 10 rainy days

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

Zucchini in Karlsruhe: care after planting

Planted on 30 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Karlsruhe during the zucchini season

About 482 mm of rain falls in the season; August is the driest month (54 mm) and May the wettest (82 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.8	9.7	82	13	15:16
June	25.2	14.8	71	11	16:11
July	26.2	15.8	63	11	15:49
August	26.4	16.1	54	10	14:26
September	22	12.4	62	10	12:39
October	16.5	8.5	80	13	10:52
November	9.6	3.4	70	13	9:11

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

1 of the nearest cities share Karlsruhe's date.

City	Distance	Date	Difference
Mannheim	54 km	1 June – 3 September	2 days later
Stuttgart	62 km	5 June – 22 August	6 days later
Strasbourg	68 km	1 June – 3 September	2 days later
Saarbrücken	106 km	3 June – 1 September	4 days later
Wiesbaden	120 km	30 May – 6 September	same day
Freiburg im Breisgau	120 km	4 June – 30 August	5 days later

Where to buy zucchini plants and seeds near Karlsruhe

Buy plants ready to set out from 30 May to 2 September (from 9 May to 2 September for an unheated greenhouse); seed for raising your own is sown from 18 April to 12 August. Within 15 km of Karlsruhe OpenStreetMap lists 25 garden centres, 3 farm-supply shops, 18 plant nurseries, 23 markets and 59 farm shops (collected 28 October 2026).

Weingärtner´s Garten- und Landhandel — farm supply
Apothekenstraße 1, 76356 Weingarten (Baden) · Mon–Wed 08:30–12:30; Thu–Fri 08:30–12:30, 15:00–18:00; Sat 08:00–13:00 · 11 km · weingärtners-landhandel.de
ZG Raiffeisen Agrar — farm supply
Stephanstraße 1, 76316 Malsch · Feb–Oct: Mon–Fri 08:00–12:00, 13:00–17:00; Sat 08:00–12:00; Nov–Jan: 08:00–12:00, 13:00–16:00 · 15 km · zg-raiffeisen.de
Weiherfelder Wochenmarkt — market
Tauberstraße 10, 76199 · Fri 10:00–14:00 · 3 km · weiherfeld-dammerstock.de
Bauernmarkt Karlsruhe — market
Alter Schlachthof 35 · Thu [1] 15:00–20:00 · 2 km · bauernmarkt-karlsruhe.de

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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