When to plant tomatoes in Windsor: 14 May – 18 July

In Windsor, tomato: sow for seedlings from 2 March to 27 May; plant into a greenhouse from 23 April to 18 July; plant out into open ground from 14 May to 18 July. For plants and seeds, the places nearby include Key Foods (farm supply, 6 km) and Fairlane Gardens Landscape Supply (garden centre, 15 km); addresses and opening hours are below.

Tomato in Windsor: soil, season and weather

In Windsor the soil, not frost, sets the date: the last frost is over around 24 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 14 May, 20 days later.

Last spring frost	24 April
Top 7 cm of soil at 15 °C	14 May, 20 days after the last frost
Into an unheated greenhouse	23 April – 18 July; April outside: 3.9 °C at night, 14 °C by day; card 16–27 °C
First autumn frost	7 November, 177 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	23 July – 26 September
Days left for picking	107
Daylight	12:16 on 23 March, 14:32 on 14 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 9 rainy days

Tomato in Windsor: care after planting

Planted on 14 May: in the first weeks water every 4 days.

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

14 May — feed: balanced (NPK)
11 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 Windsor during the tomato season

Days average above the tomato card's 16–27 °C in July (28.6 °C) and August (27.2 °C). Months that stay below 16 °C even by day on average: November (9.1 °C). Nights average below 16 °C in May and September–November (2–15.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.7	10.6	90	13	14:34
June	26.6	16.5	90	11	15:15
July	28.6	19.3	92	12	14:59
August	27.2	18.4	91	11	13:56
September	24	15.5	72	9	12:32
October	17.2	9.2	90	12	11:07
November	9.1	2	60	9	9:49

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Windsor, Toledo (United States) is 5 days earlier and London (Canada) 5 days later.

City	Distance	Date	Difference
Detroit	4 km	14 May – 18 July	same day
Ann Arbor	60 km	17 May – 16 July	3 days later
Toledo (United States)	84 km	9 May – 18 July	5 days earlier
Lansing	134 km	16 May – 13 July	2 days later
Cleveland	141 km	14 May – 1 August	same day
London (Canada)	165 km	19 May – 18 July	5 days later

Where to buy tomato plants and seeds near Windsor

Buy plants ready to set out from 14 May to 18 July (from 23 April to 18 July for an unheated greenhouse); seed for raising your own is sown from 2 March to 27 May. Within 15 km of Windsor OpenStreetMap lists 3 garden centres, 1 farm-supply shop, 11 plant nurseries, 8 markets and 3 farm shops (collected 20 October 2026).

Fairlane Gardens Landscape Supply — garden centre
Greenfield Road 4768, Dearborn · 15 km
Key Foods — farm supply
Russell Street 1352, 48207 Detroit · 6 km
Nina's Indoor Marketplace — market
Fort Street 3630, 48146 Lincoln Park · Mon, Thu–Sun 10:00–18:00 · 15 km
Grand Food Liquor — market
East Jefferson Avenue 7225, 48214 Detroit · 6 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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