When to plant watermelons in Mulhouse: 1 June – 8 August

In Mulhouse, watermelon: sow for seedlings from 13 April to 11 July; plant into a greenhouse from 11 May to 8 August; plant out into open ground from 1 June to 8 August. For plants and seeds, the places nearby include La Ferme du Château (farm shop, 3 km) and Ma Jardinerie (garden centre, 5 km); addresses and opening hours are below.

Watermelon in Mulhouse: soil, season and weather

In Mulhouse 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 – 8 August; May outside: 9.4 °C at night, 19.5 °C by day; card 18–35 °C
First autumn frost	17 November, 169 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	30 July – 6 October
Days left for picking	110
Daylight	14:37 on 4 May, 15:44 on 1 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 10 rainy days

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

Watermelon in Mulhouse: 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 Mulhouse during the watermelon season

No month of the season averages above the watermelon 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 (16.7 °C) and November (9.6 °C). Nights average below 18 °C in every month of the season, from 2.9 °C to 15.6 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	24.9	14.5	77	13	15:59
July	26.3	15.6	64	11	15:38
August	26.4	15.5	67	11	14:20
September	22	11.9	60	10	12:38
October	16.7	7.9	72	11	10:55
November	9.6	2.9	83	13	9:19

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

1 of the nearest cities share Mulhouse's date.

City	Distance	Date	Difference
Basel	29 km	5 June – 11 August	4 days later
Colmar	37 km	16 June – 8 August	15 days later
Freiburg im Breisgau	47 km	4 June – 7 August	3 days later
Bern	89 km	21 June – 25 July	20 days later
Neuchâtel	90 km	6 June – 19 August	5 days later
Strasbourg	96 km	1 June – 11 August	same day

Where to buy watermelon plants and seeds near Mulhouse

Buy plants ready to set out from 1 June to 8 August (from 11 May to 8 August for an unheated greenhouse); seed for raising your own is sown from 13 April to 11 July. Within 15 km of Mulhouse OpenStreetMap lists 12 garden centres, 2 markets and 7 farm shops (collected 27 October 2026).

Ma Jardinerie — garden centre
Sat 09:00–19:00; Mon–Fri 14:00–19:00, 09:00–12:00 · 5 km
Walliser — garden centre
Mon–Fri 09:00–12:00, 13:30–18:00; Sat 13:30–17:00 · 5 km
Le Marché du Canal Couvert de Mulhouse — market
Tue, Thu 05:30–17:00; Sat 05:30–17:00 · 0 km · marchedemulhouse.com
La Ferme du Château — farm shop
Rue de la Ferme 2, 68120 Pfastatt · Mon–Fri 08:30–19:00; Sat 08:30–18:00 · 3 km · fermeduchateaupfastatt.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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