When to plant tomatoes in Gatineau: 27 May – 12 July

In Gatineau, tomato: sow for seedlings from 15 March to 21 May; plant into a greenhouse from 6 May to 12 July; plant out into open ground from 27 May to 12 July. For plants and seeds, the places nearby include Emery (garden centre, 6 km) and Ritchie Feed & Seed (garden centre, 10 km); addresses and opening hours are below.

Tomato in Gatineau: soil, season and weather

In Gatineau the soil, not frost, sets the date: the last frost is over around 30 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 27 May, 27 days later.

Last spring frost	30 April
Top 7 cm of soil at 15 °C	27 May, 27 days after the last frost
Into an unheated greenhouse	6 May – 12 July; May outside: 7.5 °C at night, 18.8 °C by day; card 16–27 °C
First autumn frost	1 November, 158 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	5 August – 20 September
Days left for picking	88
Daylight	12:58 on 5 April, 15:18 on 27 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 9 rainy days

Tomato in Gatineau: 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 Gatineau during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 26.4 °C. Months that stay below 16 °C even by day on average: October (14.3 °C) and November (5.2 °C). Nights average below 16 °C in May, June and September–November (-1.5–13.3 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.8	7.5	87	12	14:53
June	23.5	13.3	114	12	15:39
July	26.4	16.7	119	13	15:21
August	25	16.2	119	13	14:09
September	21.3	12.3	73	9	12:35
October	14.3	6.4	105	12	11:01
November	5.2	-1.5	81	13	9:32

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Gatineau, Montreal is 6 days earlier and Montpelier 2 days later.

City	Distance	Date	Difference
Ottawa	7 km	27 May – 12 July	same day
Montreal	166 km	21 May – 12 July	6 days earlier
Burlington	225 km	26 May – 14 July	1 day earlier
Trois-Rivières	262 km	25 May – 9 July	2 days earlier
Syracuse (United States)	272 km	22 May – 17 July	5 days earlier
Montpelier	282 km	29 May – 27 June	2 days later

Where to buy tomato plants and seeds near Gatineau

Buy plants ready to set out from 27 May to 12 July (from 6 May to 12 July for an unheated greenhouse); seed for raising your own is sown from 15 March to 21 May. Within 15 km of Gatineau OpenStreetMap lists 9 garden centres, 1 farm-supply shop, 7 markets and 1 farm shop (collected 20 October 2026).

Emery — garden centre
Boulevard Maloney Est 600, J8P 7M4 Gatineau · Mon–Wed 08:30–20:00; Thu–Fri 08:30–21:00; Sat 08:30–17:00; Sun 08:30–17:00 · 6 km · emerycentrejardin.ca
Ritchie Feed & Seed — garden centre
Windmill Lane 1390, K1B 4V5 · 10 km · ritchiefeed.com
Nesbitt's Greenhouse and Nursery — garden centre
Chemin Eardley 145, J9H 7G5 Gatineau · 15 km · nesbittsgreenhouse.ca
Cleroux Farm Produce Inc. — garden centre
Navan Road 2567, Ottawa · Mon–Fri 08:00–18:00; Sat–Sun 08:00–17:00; Nov–Apr closed · 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.

Questions