When to plant watermelons in Amiens: 12 June – 12 August

In Amiens, watermelon: sow for seedlings from 24 April to 15 July; plant into a greenhouse from 22 May to 12 August; plant out into open ground from 12 June to 12 August. For plants and seeds, the places nearby include Gamm Vert (garden centre, 2 km) and Jardiland (garden centre, 3 km); addresses and opening hours are below.

Watermelon in Amiens: soil, season and weather

In Amiens 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 watermelon card — only around 12 June, 68 days later.

Last spring frost	5 April
Top 7 cm of soil at 18 °C	12 June, 68 days after the last frost
Into an unheated greenhouse	22 May – 12 August; May outside: 8.5 °C at night, 17.8 °C by day; card 18–35 °C
First autumn frost	21 November, 162 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	10 August – 10 October
Days left for picking	103
Daylight	15:23 on 15 May, 16:17 on 12 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 10 rainy days

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

Watermelon in Amiens: care after planting

Planted on 12 June: in the first weeks water every 5 days.

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

12 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 Amiens during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 23.1 °C. Months that stay below 18 °C even by day on average: October (15.9 °C) and November (10.4 °C). Nights average below 18 °C in every month of the season, from 4.8 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.6	12.1	66	12	16:19
July	23	13.7	63	11	15:57
August	23.1	13.9	59	10	14:31
September	20.2	11.7	62	12	12:40
October	15.9	9	81	13	10:50
November	10.4	4.8	85	14	9:05

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Amiens, Paris is 14 days earlier and Rouen 4 days later.

City	Distance	Date	Difference
Lille	98 km	11 June – 12 August	1 day earlier
Rouen	100 km	16 June – 12 August	4 days later
Paris	116 km	29 May – 11 August	14 days earlier
Mons	132 km	10 June – 10 August	2 days earlier
Reims	144 km	31 May – 8 August	12 days earlier
Bruges	160 km	15 June – 21 August	3 days later

Where to buy watermelon plants and seeds near Amiens

Buy plants ready to set out from 12 June to 12 August (from 22 May to 12 August for an unheated greenhouse); seed for raising your own is sown from 24 April to 15 July. Within 15 km of Amiens OpenStreetMap lists 11 garden centres, 1 farm-supply shop, 7 markets and 6 farm shops (collected 27 October 2026).

La Ferme Des Hortillonnages — farm shop
3 km
Jardiland — garden centre
Avenue de l'Europe 150, 80080 Amiens · Mon–Sat 09:30–19:00; Sun 10:00–12:30, 14:30–18:30 · 3 km · jardiland.com
Allmo Services — garden centre
Avenue Roger Dumoulin 19, 80080 Amiens · Mon–Fri 08:00–12:00, 14:00–18:00; Sat 09:00–12:00 · 3 km · allmo-services.fr
Gamm Vert — garden centre
Rue du Faubourg de Hem 378 · Mon–Sat 09:00–12:00, 14:00–19:00; Sun closed · 2 km · gammvert.fr

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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