When to plant watermelons in Metz: 4 June – 8 August

In Metz, watermelon: sow for seedlings from 16 April to 11 July; plant into a greenhouse from 14 May to 8 August; plant out into open ground from 4 June to 8 August.

Watermelon in Metz: soil, season and weather

In Metz the soil, not frost, sets the date: the last frost is over around 15 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 4 June, 50 days later.

Last spring frost	15 April
Top 7 cm of soil at 18 °C	4 June, 50 days after the last frost
Into an unheated greenhouse	14 May – 8 August; May outside: 8.8 °C at night, 18.7 °C by day; card 18–35 °C
First autumn frost	17 November, 166 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	2 August – 6 October
Days left for picking	107
Daylight	14:54 on 7 May, 16:00 on 4 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 10 rainy days

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

Watermelon in Metz: care after planting

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

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

4 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 Metz during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 25.5 °C. Months that stay below 18 °C even by day on average: October (16 °C) and November (9.4 °C). Nights average below 18 °C in every month of the season, from 3.5 °C to 15.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	23.8	13.6	78	12	16:12
July	25.1	14.7	70	10	15:50
August	25.5	15.1	54	10	14:26
September	21.3	11.5	74	10	12:39
October	16	8.1	74	12	10:52
November	9.4	3.5	77	14	9:10

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Metz, Strasbourg is 3 days earlier and Esch-sur-Alzette 11 days later.

City	Distance	Date	Difference
Esch-sur-Alzette	45 km	15 June – 9 August	11 days later
Nancy	49 km	3 June – 8 August	1 day earlier
Luxembourg	55 km	7 June – 9 August	3 days later
Saarbrücken	60 km	3 June – 9 August	1 day earlier
Ettelbruck	81 km	6 June – 6 August	2 days later
Strasbourg	130 km	1 June – 11 August	3 days earlier

Where to buy watermelon plants and seeds near Metz

Buy plants ready to set out from 4 June to 8 August (from 14 May to 8 August for an unheated greenhouse); seed for raising your own is sown from 16 April to 11 July. Within 15 km of Metz OpenStreetMap lists 10 garden centres, 1 farm-supply shop, 10 markets and 11 farm shops (collected 27 October 2026).

Malassé — garden centre
2 km
Établissements horticoles Bichwiller — garden centre
9 km
Les Asperges de la Grange le Mercier — farm shop
4 km · grangelemercier.com
La Ruche Qui Dit Oui — farm shop
3 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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