When to plant tomatoes in Mulhouse: 13 May – 28 July

In Mulhouse, tomato: sow for seedlings from 1 March to 6 June; plant into a greenhouse from 22 April to 28 July; plant out into open ground from 13 May to 28 July. For plants and seeds, the places nearby include Jardinerie Éthique (garden centre, 1 km) and Ma Jardinerie (garden centre, 5 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 13 May, 37 days later.

Last spring frost	6 April
Top 7 cm of soil at 15 °C	13 May, 37 days after the last frost
Into an unheated greenhouse	22 April – 28 July; April outside: 5.2 °C at night, 15.7 °C by day; card 16–27 °C
First autumn frost	17 November, 188 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	22 July – 6 October
Days left for picking	118
Daylight	12:15 on 22 March, 15:02 on 13 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 10 rainy days

Tomato in Mulhouse: care after planting

Planted on 13 May: in the first weeks water every 4 days.

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

13 May — feed: balanced (NPK)
10 June — feed: nitrogen

Pests and diseases of tomato 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 tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 26.4 °C. Months that stay below 16 °C even by day on average: November (9.6 °C). Nights average below 16 °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
May	19.5	9.4	91	14	15:07
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

Tomato in nearby cities

Around Mulhouse, Strasbourg is 1 day earlier and Bern 21 days later.

City	Distance	Date	Difference
Basel	29 km	14 May – 31 July	1 day later
Colmar	37 km	31 May – 28 July	18 days later
Freiburg im Breisgau	47 km	13 May – 27 July	same day
Bern	89 km	3 June – 14 July	21 days later
Neuchâtel	90 km	14 May – 8 August	1 day later
Strasbourg	96 km	12 May – 31 July	1 day earlier

Where to buy tomato plants and seeds near Mulhouse

Buy plants ready to set out from 13 May to 28 July (from 22 April to 28 July for an unheated greenhouse); seed for raising your own is sown from 1 March to 6 June. Within 15 km of Mulhouse OpenStreetMap lists 12 garden centres, 2 markets and 7 farm shops (collected 27 October 2026).

Trèfle Vert — garden centre
Rue de l'Ill 12, 68130 Altkirch · Mon–Fri 09:00–12:00, 14:00–18:30; Sat 09:00–18:00 · 15 km
Truffaut — garden centre
Mon–Fri 09:00–12:30, 14:00–19:00; Sat 09:00–19:00 · 6 km · truffaut.com
Jardinerie Éthique — garden centre
Rue de l'Arsenal 24, 68100 · 1 km
Ma Jardinerie — garden centre
Sat 09:00–19:00; Mon–Fri 14:00–19:00, 09:00–12:00 · 5 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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