When to plant tomatoes in Hamilton: 19 May – 18 July

In Hamilton, tomato: sow for seedlings from 7 March to 27 May; plant into a greenhouse from 28 April to 18 July; plant out into open ground from 19 May to 18 July. For plants and seeds, the places nearby include Harper's Garden Centre (garden centre, 9 km) and The Dirt Depot (garden centre, 9 km); addresses and opening hours are below.

Tomato in Hamilton: soil, season and weather

In Hamilton the soil, not frost, sets the date: the last frost is over around 19 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 19 May, 30 days later.

Last spring frost	19 April
Top 7 cm of soil at 15 °C	19 May, 30 days after the last frost
Into an unheated greenhouse	28 April – 18 July; April outside: 3 °C at night, 12.2 °C by day; card 16–27 °C
First autumn frost	7 November, 172 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	28 July – 26 September
Days left for picking	102
Daylight	12:31 on 28 March, 14:48 on 19 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 9 rainy days

Tomato in Hamilton: care after planting

Planted on 19 May: in the first weeks water every 4 days.

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

19 May — feed: balanced (NPK)
16 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 Hamilton during the tomato season

Days average above the tomato card's 16–27 °C in July (28 °C). Months that stay below 16 °C even by day on average: November (9.1 °C). Nights average below 16 °C in May, June and September–November (2.4–15.6 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.8	9.4	78	11	14:40
June	24.8	15.6	71	10	15:22
July	28	18.8	86	11	15:05
August	26.6	18.5	69	11	13:59
September	23.2	15.3	59	9	12:33
October	16.6	9.4	85	11	11:05
November	9.1	2.4	61	10	9:44

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

1 of the nearest cities share Hamilton's date.

City	Distance	Date	Difference
Kitchener	57 km	22 May – 6 July	3 days later
Toronto	58 km	20 May – 10 July	1 day later
Buffalo	88 km	20 May – 21 July	1 day later
London (Canada)	116 km	19 May – 18 July	same day
Erie	126 km	20 May – 30 July	1 day later
Rochester	181 km	20 May – 23 July	1 day later

Where to buy tomato plants and seeds near Hamilton

Buy plants ready to set out from 19 May to 18 July (from 28 April to 18 July for an unheated greenhouse); seed for raising your own is sown from 7 March to 27 May. Within 15 km of Hamilton OpenStreetMap lists 10 garden centres, 5 markets and 4 farm shops (collected 20 October 2026).

Harper's Garden Centre — garden centre
Wilson Street East 1039, L9H 5E3 · Mon–Fri 09:00–18:00; Sat, Sun 09:00–19:00 · 9 km · harpersgardencentre.ca
Fora Outdoor — garden centre
Fiddlers Green Road 591, L9G 3L1 · Mon–Sat 09:00–17:00 · 12 km · foraoutdoor.com
The Dirt Depot — garden centre
Highway 5 West 163 · 9 km · thedirtdepot.com
Terra — garden centre
Dundas Street 2273, Burlington · 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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