When to plant watermelons in Strasbourg: 1 June – 11 August

In Strasbourg, watermelon: sow for seedlings from 13 April to 14 July; plant into a greenhouse from 11 May to 11 August; plant out into open ground from 1 June to 11 August. For plants and seeds, the places nearby include Livraison de paniers (farm shop, 5 km) and Point de livraison de paniers de légumes (farm shop, 6 km); addresses and opening hours are below.

Watermelon in Strasbourg: soil, season and weather

In Strasbourg the soil, not frost, sets the date: the last frost is over around 6 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 1 June, 56 days later.

Last spring frost	6 April
Top 7 cm of soil at 18 °C	1 June, 56 days after the last frost
Into an unheated greenhouse	11 May – 11 August; May outside: 9.9 °C at night, 20 °C by day; card 18–35 °C
First autumn frost	20 November, 172 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	30 July – 9 October
Days left for picking	113
Daylight	14:41 on 4 May, 15:50 on 1 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 10 rainy days

The same dates in Strasbourg hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Strasbourg: care after planting

Planted on 1 June: in the first weeks water every 5 days.

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

1 June — feed: balanced (NPK)

Pests and diseases of watermelon 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 Strasbourg during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 26.2 °C. Months that stay below 18 °C even by day on average: October (16.7 °C) and November (9.7 °C). Nights average below 18 °C in every month of the season, from 3.7 °C to 16 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	25.2	14.9	81	13	16:06
July	26.2	16	78	11	15:45
August	26.2	16	66	11	14:24
September	22.1	12.5	65	10	12:39
October	16.7	8.6	77	13	10:53
November	9.7	3.7	75	13	9:14

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Strasbourg, Karlsruhe is 2 days earlier and Colmar 15 days later.

City	Distance	Date	Difference
Colmar	62 km	16 June – 8 August	15 days later
Freiburg im Breisgau	65 km	4 June – 7 August	3 days later
Karlsruhe	68 km	30 May – 10 August	2 days earlier
Saarbrücken	93 km	3 June – 9 August	2 days later
Mulhouse	96 km	1 June – 8 August	same day
Stuttgart	108 km	5 June – 30 July	4 days later

Where to buy watermelon plants and seeds near Strasbourg

Buy plants ready to set out from 1 June to 11 August (from 11 May to 11 August for an unheated greenhouse); seed for raising your own is sown from 13 April to 14 July. Within 15 km of Strasbourg OpenStreetMap lists 15 garden centres, 13 markets and 31 farm shops (collected 20 October 2026).

Livraison de paniers — farm shop · sells: fruits, vegetables, bread, eggs
Rue Saint-Laurent 2A, Bischheim · Fri 11:30–19:00 · 5 km
Point de livraison de paniers de légumes — farm shop · sells: fruits, vegetables, bread, milk products
Rue Krafft 4, Illkirch-Graffenstaden · Thu 18:30–19:30 · 6 km
Ferme Heckmann — farm shop
Lieu-dit Mayersbreit, 67120 Duppigheim · Mon–Fri 09:00–19:00; Sat 09:00–12:00; Apr–Jun Mon–Sun 09:00–18:30 · 13 km · ferme-heckmann-bio-67.fr
Point de livraison de paniers bio — farm shop
Route de Lyon 269, 67400 Illkirch-Graffenstaden · Fri 11:30–19:00 · 6 km

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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