When to plant tomatoes in Chambéry: 13 May – 31 July

In Chambéry, tomato: sow for seedlings from 1 March to 9 June; plant into a greenhouse from 22 April to 31 July; plant out into open ground from 13 May to 31 July. For plants and seeds, the places nearby include Cholat Jardins et Pépinières (garden centre, 1 km) and Jardiland (garden centre, 4 km); addresses and opening hours are below.

Tomato in Chambéry: soil, season and weather

In Chambéry the soil, not frost, sets the date: the last frost is over around 5 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 13 May, 38 days later.

Last spring frost	5 April
Top 7 cm of soil at 15 °C	13 May, 38 days after the last frost
Into an unheated greenhouse	22 April – 31 July; April outside: 6.2 °C at night, 16.8 °C by day; card 16–27 °C
First autumn frost	20 November, 191 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	22 July – 9 October
Days left for picking	121
Daylight	12:14 on 22 March, 14:48 on 13 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 10 rainy days

Tomato in Chambéry: 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 Chambéry during the tomato season

Days average above the tomato card's 16–27 °C in July (27.2 °C) and August (27.4 °C). Months that stay below 16 °C even by day on average: November (11.5 °C). Nights average below 16 °C in May, June and September–November (3.8–15.1 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.8	10.1	162	16	14:53
June	25.1	15.1	146	16	15:40
July	27.2	16.7	113	12	15:22
August	27.4	16.6	94	10	14:09
September	22.5	12.9	117	12	12:35
October	18.4	9.1	137	12	11:00
November	11.5	3.8	153	13	9:32

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Chambéry, Valence is 12 days earlier and Aosta 52 days later.

City	Distance	Date	Difference
Annecy	41 km	2 June – 25 July	20 days later
Grenoble	45 km	20 June – 5 July	38 days later
Geneva	72 km	28 May – 28 July	15 days later
Lyon	87 km	2 May – 5 August	11 days earlier
Valence	106 km	1 May – 1 August	12 days earlier
Aosta	110 km	from 4 July	52 days later

Where to buy tomato plants and seeds near Chambéry

Buy plants ready to set out from 13 May to 31 July (from 22 April to 31 July for an unheated greenhouse); seed for raising your own is sown from 1 March to 9 June. Within 15 km of Chambéry OpenStreetMap lists 12 garden centres, 1 farm-supply shop, 3 plant nurseries, 5 markets and 18 farm shops (collected 27 October 2026).

Au Jardin des Plantes — garden centre
Rue des Belledonnes 670, 73420 Voglans · Mon–Sat 09:00–12:00, 14:00–19:00, Sun 09:30–12:30, 14:30–18:30 · 6 km · aujardindesplantes.com
Cholat Jardins et Pépinières — garden centre
Mon–Sat 09:00–12:00, 14:00–18:00 · 1 km · cholat-pepinieres.com
Jardiland — garden centre
Mon–Fri 09:00–12:00, 14:00–19:00; Sat 09:00–19:00; Sun 09:30–12:15, 14:30–18:00 · 4 km · jardiland.com
Jardiland — garden centre
Mon–Fri 09:30–12:30, 14:00–19:00; Sat 09:00–19:00; Sun 09:30–12:30 · 10 km · jardiland.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.

Questions