When to plant tomatoes in Kitchener: 22 May – 6 July

In Kitchener, tomato: sow for seedlings from 10 March to 15 May; plant into a greenhouse from 1 May to 6 July; plant out into open ground from 22 May to 6 July. For plants and seeds, the places nearby include Warren Greenhouses (garden centre, 2 km) and L&L Market (garden centre, 4 km); addresses and opening hours are below.

Tomato in Kitchener: soil, season and weather

In Kitchener 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 22 May, 22 days later.

Last spring frost	30 April
Top 7 cm of soil at 15 °C	22 May, 22 days after the last frost
Into an unheated greenhouse	1 May – 6 July; May outside: 7.8 °C at night, 19 °C by day; card 16–27 °C
First autumn frost	26 October, 157 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	31 July – 14 September
Days left for picking	87
Daylight	12:40 on 31 March, 14:55 on 22 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 9 rainy days

Tomato in Kitchener: care after planting

Planted on 22 May: in the first weeks water every 4 days.

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

22 May — feed: balanced (NPK)
19 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 Kitchener during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 26.8 °C. Months that stay below 16 °C even by day on average: October (15 °C). Nights average below 16 °C in May, June and August–October (6.7–15.7 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19	7.8	80	12	14:41
June	24.4	13.6	97	11	15:24
July	26.8	16.3	79	12	15:07
August	25.3	15.7	80	11	14:00
September	22.1	12.5	67	9	12:33
October	15	6.7	84	12	11:05

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Kitchener; the closest date is in Toronto, 2 days earlier.

City	Distance	Date	Difference
Hamilton	57 km	19 May – 18 July	3 days earlier
London (Canada)	77 km	19 May – 18 July	3 days earlier
Toronto	94 km	20 May – 10 July	2 days earlier
Buffalo	145 km	20 May – 21 July	2 days earlier
Erie	149 km	20 May – 30 July	2 days earlier
Cleveland	236 km	14 May – 1 August	8 days earlier

Where to buy tomato plants and seeds near Kitchener

Buy plants ready to set out from 22 May to 6 July (from 1 May to 6 July for an unheated greenhouse); seed for raising your own is sown from 10 March to 15 May. Within 15 km of Kitchener OpenStreetMap lists 13 garden centres, 1 farm-supply shop, 4 markets and 5 farm shops (collected 20 October 2026).

Belgian Nursery — garden centre
Victoria Street 2615, N0B 1M0 Breslau · public holidays closed; Jan–Mar: Sun–Tue closed; Wed–Fri 09:00–18:00; Sat 09:00–17:00; Apr–Jun: Mon–Fri 08:00–15:00; Sat–Sun 09:00–15:00; Jul–Sept: Mon–Fri 09:00–18:00; Sat 09:00–17:00; Sun closed, Oct–Dec: Wed–Fri 09:00–18:00; Sat 09:00–17:00; Sun–Tue closed; Dec 24 09:00–15:00; Dec 31 09:00–15:00 · 12 km · belgian-nursery.com
L&L Market — garden centre
Lancaster Street West 101 · Mon–Sat 08:00–19:00; Sun 09:00–18:00 · 4 km
Warren Greenhouses — garden centre
Strange Street 115 · 2 km
Kolb's Green Thumb Nursery — garden centre
Victoria Street North 1501 · 7 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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