When to plant cucumbers in Karlsruhe: 30 May – 4 September

In Karlsruhe, cucumber: sow for seedlings from 11 April to 7 August; plant into a greenhouse from 9 May to 4 September; plant out into open ground from 30 May to 4 September. For plants and seeds, the places nearby include ZG Raiffeisen Markt (garden centre, 2 km) and Dehner (garden centre, 12 km); addresses and opening hours are below.

Cucumber 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 cucumber 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
Into an unheated greenhouse	9 May – 4 September; May outside: 9.7 °C at night, 19.8 °C by day; card 18–25 °C
First autumn frost	19 November, 173 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	3 July – 8 October
Days left for picking	139
Daylight	14:38 on 2 May, 15:51 on 30 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 10 rainy days

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

Cucumber in Karlsruhe: care after planting

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

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

6 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 Karlsruhe during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 26.4 °C. Months that stay below 18 °C even by day on average: October (16.5 °C) and November (9.6 °C). Nights average below 18 °C in every month of the season, from 3.4 °C to 16.1 °C.

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

Cucumber in nearby cities

1 of the nearest cities share Karlsruhe's date.

City	Distance	Date	Difference
Mannheim	54 km	1 June – 5 September	2 days later
Stuttgart	62 km	5 June – 24 August	6 days later
Strasbourg	68 km	1 June – 5 September	2 days later
Saarbrücken	106 km	3 June – 3 September	4 days later
Wiesbaden	120 km	30 May – 8 September	same day
Freiburg im Breisgau	120 km	4 June – 1 September	5 days later

Where to buy cucumber plants and seeds near Karlsruhe

Buy plants ready to set out from 30 May to 4 September (from 9 May to 4 September for an unheated greenhouse); seed for raising your own is sown from 11 April to 7 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).

Dehner — garden centre
Benzstraße 7-9, 76307 Karlsbad · Mar–Jul: Mon–Sat 09:00–20:00; Aug–Feb: Mon–Fri 09:00–19:00; Aug–Feb: Sat 09:00–19:00 · 12 km · dehner.de
Pflanzen Oase Jansen — garden centre
Taubenbrunnwiesen 1, 76307 Karlsbad · Mon, Tue, Thu, Fri 08:00–12:00, 12:30–18:00; Sat 08:00–14:30 · 15 km · baumschule-jansen.de
Gartencenter Heckert — garden centre
Im Schollengarten 39, 76646 Bruchsal · Mon–Sat 09:00–18:00 · 15 km · heckert-gartencenter.de
ZG Raiffeisen Markt — garden centre
Fautenbruchstraße 35, 76137 Karlsruhe · Mon–Fri 08:30–19:00, Sat 08:30–16:00 · 2 km · zg-raiffeisen.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.

Questions