When to plant tomatoes in Rennes: 13 May – 8 August

In Rennes, tomato: sow for seedlings from 1 March to 17 June; plant into a greenhouse from 22 April to 8 August; plant out into open ground from 13 May to 8 August. For plants and seeds, the places nearby include Truffaut (garden centre, 3 km) and Jardiland (garden centre, 5 km); addresses and opening hours are below.

Tomato in Rennes: soil, season and weather

In Rennes the soil, not frost, sets the date: the last frost is over around 12 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 13 May, 62 days later.

Last spring frost	12 March
Top 7 cm of soil at 15 °C	13 May, 62 days after the last frost
Into an unheated greenhouse	22 April – 8 August; April outside: 6.1 °C at night, 15.7 °C by day; card 16–27 °C
First autumn frost	28 November, 199 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	22 July – 17 October
Days left for picking	129
Daylight	12:15 on 22 March, 15:05 on 13 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 9 rainy days

Tomato in Rennes: 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 Rennes during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 24.4 °C. Months that stay below 16 °C even by day on average: November (12.4 °C). Nights average below 16 °C in every month of the season, from 6.1 °C to 14.4 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.1	9.4	61	12	15:10
June	22.8	12.9	83	11	16:02
July	24.3	14.3	50	8	15:41
August	24.4	14.4	48	9	14:21
September	21.5	12.4	58	9	12:38
October	17.4	9.8	87	12	10:54
November	12.4	6.1	78	12	9:17

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Rennes, Nantes is 12 days earlier and Caen 8 days later.

City	Distance	Date	Difference
Nantes	99 km	1 May – 9 August	12 days earlier
Angers	110 km	5 May – 7 August	8 days earlier
Le Mans	140 km	8 May – 4 August	5 days earlier
Caen	154 km	21 May – 15 August	8 days later
Quimper	180 km	19 May – 19 August	6 days later
Tours	194 km	8 May – 7 August	5 days earlier

Where to buy tomato plants and seeds near Rennes

Buy plants ready to set out from 13 May to 8 August (from 22 April to 8 August for an unheated greenhouse); seed for raising your own is sown from 1 March to 17 June. Within 15 km of Rennes OpenStreetMap lists 21 garden centres, 5 farm-supply shops, 3 plant nurseries, 41 markets and 19 farm shops (collected 20 October 2026).

Truffaut — garden centre
Avenue du Canada 54, 35200 Rennes · Mon–Sat 09:30–19:00; Sun 10:00–18:30 · 3 km · truffaut.com
Jardiland — garden centre
Avenue des Peupliers 21, 35510 Cesson-Sévigné · Mon–Fri 09:30–12:30, 14:00–19:00; Sat 09:30–19:00; Sun 10:00–13:00, 14:30–19:00 · 5 km · jardiland.com
Magasin Vert — garden centre
Village la Forme Zone de Pluvignon Le Village, 35830 Betton · Mon–Sat 09:30–19:30; Sun 10:00–12:30, 14:00–18:30 · 7 km · monmagasinvert.fr
LaMaison.fr — garden centre
Avenue des Platanes 8, 35310 Mordelles · Mon–Sat 09:00–12:15, 14:00–19:00 · 12 km · lamaison.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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