When to plant zucchini in Hamilton: 1 June – 21 August

In Hamilton, zucchini: sow for seedlings from 20 April to 31 July; plant into a greenhouse from 11 May to 21 August; plant out into open ground from 1 June to 21 August. For plants and seeds, the places nearby include Harper's Garden Centre (garden centre, 9 km); addresses and opening hours are below.

Zucchini 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 18 °C — the minimum on the zucchini card — only around 1 June, 43 days later.

Last spring frost	19 April
Top 7 cm of soil at 18 °C	1 June, 43 days after the last frost
First autumn frost	7 November, 159 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	7 July – 26 September
Days left for picking	123
Daylight	14:31 on 11 May, 15:10 on 1 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 9 rainy days

The same dates in Hamilton hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Hamilton: care after planting

Planted on 1 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Hamilton during the zucchini season

About 431 mm of rain falls in the season; September is the driest month (59 mm) and July the wettest (86 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
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

Zucchini in nearby cities

Around Hamilton, Toronto is 3 days earlier and Rochester 1 day later.

City	Distance	Date	Difference
Kitchener	57 km	31 May – 9 August	1 day earlier
Toronto	58 km	29 May – 13 August	3 days earlier
Buffalo	88 km	29 May – 24 August	3 days earlier
London (Canada)	116 km	29 May – 21 August	3 days earlier
Erie	126 km	30 May – 2 September	2 days earlier
Rochester	181 km	2 June – 26 August	1 day later

Where to buy zucchini plants and seeds near Hamilton

Buy plants ready to set out from 1 June to 21 August (from 11 May to 21 August for an unheated greenhouse); seed for raising your own is sown from 20 April to 31 July. Within 15 km of Hamilton OpenStreetMap lists 10 garden centres, 5 markets and 4 farm shops (collected 20 October 2026).

Kastrau — garden centre
8 km
Terra greenhouses — garden centre
12 km
Farmer Al's Market — market
9 km
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

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