When to plant watermelons in Reims: 31 May – 8 August

In Reims, watermelon: sow for seedlings from 12 April to 11 July; plant into a greenhouse from 10 May to 8 August; plant out into open ground from 31 May to 8 August. For plants and seeds, the places nearby include decodujardin (garden centre, 4 km) and Collard vert Loisirs (garden centre, 5 km); addresses and opening hours are below.

Watermelon in Reims: soil, season and weather

In Reims the soil, not frost, sets the date: the last frost is over around 13 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 31 May, 48 days later.

Last spring frost	13 April
Top 7 cm of soil at 18 °C	31 May, 48 days after the last frost
Into an unheated greenhouse	10 May – 8 August; May outside: 8.9 °C at night, 18.9 °C by day; card 18–35 °C
First autumn frost	17 November, 170 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	29 July – 6 October
Days left for picking	111
Daylight	14:42 on 3 May, 15:55 on 31 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 9 rainy days

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

Watermelon in Reims: care after planting

Planted on 31 May: in the first weeks water every 5 days.

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

31 May — 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 Reims during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 24.8 °C. Months that stay below 18 °C even by day on average: October (16.3 °C) and November (10.2 °C). Nights average below 18 °C in every month of the season, from 4.5 °C to 14.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.9	8.9	75	12	15:18
June	23.2	13.2	67	12	16:13
July	24.5	14.5	64	10	15:51
August	24.8	14.6	53	9	14:27
September	21.3	11.8	60	10	12:40
October	16.3	8.9	75	13	10:51
November	10.2	4.5	64	12	9:10

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Reims, Paris is 2 days earlier and Esch-sur-Alzette 15 days later.

City	Distance	Date	Difference
Troyes	107 km	2 June – 9 August	2 days later
Paris	130 km	29 May – 11 August	2 days earlier
Charleroi	131 km	10 June – 6 August	10 days later
Mons	132 km	10 June – 10 August	10 days later
Amiens	144 km	12 June – 12 August	12 days later
Esch-sur-Alzette	144 km	15 June – 9 August	15 days later

Where to buy watermelon plants and seeds near Reims

Buy plants ready to set out from 31 May to 8 August (from 10 May to 8 August for an unheated greenhouse); seed for raising your own is sown from 12 April to 11 July. Within 15 km of Reims OpenStreetMap lists 10 garden centres, 2 farm-supply shops, 7 markets and 1 farm shop (collected 20 October 2026).

decodujardin — garden centre
Route de Witry 204, 51100 Reims · Mon–Sun 09:00–19:30 · 4 km
Collard vert Loisirs — garden centre
Rue de la Garenne, 51370 Thillois · 5 km · groupe-collard.com
Chez l'Horticulteur — garden centre
Rue Saint-Rémi 1, 51370 Les Mesneux · Mon 14:30–18:30; Tue–Fri 09:30–12:00, 14:30–18:30; Sat 09:30–18:30; 2026 Nov 01, 2026 Nov 11 closed · 6 km
Ravillon — farm supply
Mon 08:00–12:00, 14:00–18:00; Tue–Fri 08:00–12:00, 14:00–17:45 · 8 km · delta-force.com

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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