When to plant tomatoes in Quebec City: 27 May – 8 July

In Quebec City, tomato: sow for seedlings from 15 March to 17 May; plant into a greenhouse from 6 May to 8 July; plant out into open ground from 27 May to 8 July. For plants and seeds, the places nearby include L'Haies Pro (garden centre, 4 km) and Jardin Hamel (garden centre, 10 km); addresses and opening hours are below.

Tomato in Quebec City: soil, season and weather

In Quebec City the soil, not frost, sets the date: the last frost is over around 5 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 27 May, 22 days later.

Last spring frost	5 May
Top 7 cm of soil at 15 °C	27 May, 22 days after the last frost
Into an unheated greenhouse	6 May – 8 July; May outside: 6.7 °C at night, 17.9 °C by day; card 16–27 °C
First autumn frost	28 October, 154 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	5 August – 16 September
Days left for picking	84
Daylight	13:01 on 5 April, 15:27 on 27 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 11 rainy days

Tomato in Quebec City: care after planting

Planted on 27 May: in the first weeks water every 4 days.

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

27 May — feed: balanced (NPK)
24 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 Quebec City during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 25.4 °C. Months that stay below 16 °C even by day on average: October (13.3 °C). Nights average below 16 °C in May, June and August–October (5.4–15.3 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	17.9	6.7	105	13	15:01
June	22.6	12.6	144	13	15:51
July	25.4	16.2	161	16	15:31
August	24.2	15.3	144	15	14:15
September	20.2	11.1	101	11	12:37
October	13.3	5.4	128	12	10:58

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Quebec City, Montreal is 6 days earlier and Saguenay 14 days later.

City	Distance	Date	Difference
Trois-Rivières	114 km	25 May – 9 July	2 days earlier
Sherbrooke	165 km	27 May – 7 July	same day
Saguenay	180 km	10 June – 2 July	14 days later
Montreal	233 km	21 May – 12 July	6 days earlier
Bangor	288 km	31 May – 14 July	4 days later
Augusta	299 km	27 May – 14 July	same day

Where to buy tomato plants and seeds near Quebec City

Buy plants ready to set out from 27 May to 8 July (from 6 May to 8 July for an unheated greenhouse); seed for raising your own is sown from 15 March to 17 May. Within 15 km of Quebec City OpenStreetMap lists 6 garden centres, 1 farm-supply shop and 3 markets (collected 20 October 2026).

L'Haies Pro — garden centre
Rue De Ségur 1633, G6W 0T6 Lévis · Mon–Fri 06:00–18:00 · 4 km · haiespro.com
Jardin Hamel — garden centre
Boulevard Wilfrid-Hamel 6029, L'Ancienne-Lorette · Mon–Wed 09:00–18:00; Thu–Fri 09:00–21:00; Sat–Sun 08:30–17:00 · 10 km
Centre Jardin de l'aeroport — garden centre
Route de l'Aéroport 1762 · 13 km · jardindeaeroport.com
Floralies Jouvences — garden centre
Avenue Jules-Verne 2020, G2G 2R2 Québec · 13 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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