When to plant tomatoes in Saskatoon: 30 May – 16 June

In Saskatoon, tomato: sow for seedlings from 18 March to 25 April; plant into a greenhouse from 9 May to 16 June; plant out into open ground from 30 May to 16 June. For plants and seeds, the places nearby include Hi-Way Greenhouse (garden centre, 3 km) and Early's Farm & Garden Centre Inc. (garden centre, 4 km); addresses and opening hours are below.

Tomato in Saskatoon: soil, season and weather

In Saskatoon the soil, not frost, sets the date: the last frost is over around 15 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 30 May, 15 days later. 129 days separate planting out (30 May) from the first autumn frost (6 October); the card's 70 days to the first harvest leave 59 for picking, so a start 8 weeks late would still fit.

Last spring frost	15 May
Top 7 cm of soil at 15 °C	30 May, 15 days after the last frost
Into an unheated greenhouse	9 May – 16 June; May outside: 5.8 °C at night, 19.2 °C by day; card 16–27 °C
First autumn frost	6 October, 129 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	8 August – 25 August
Days left for picking	59
Daylight	13:25 on 8 April, 16:20 on 30 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 5 rainy days

Tomato in Saskatoon: care after planting

Planted on 30 May: in the first weeks water every 4 days.

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

30 May — feed: balanced (NPK)
27 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 Saskatoon during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 25.3 °C. Months that stay below 16 °C even by day on average: October (9.7 °C). Nights average below 16 °C in every month of the season, from 0.3 °C to 14 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.2	5.8	42	7	15:40
June	22.8	11.2	86	11	16:44
July	25.3	14	60	10	16:18
August	24.5	12.7	43	7	14:43
September	20.1	8.3	32	6	12:43
October	9.7	0.3	25	5	10:44

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Saskatoon, Billings is 19 days earlier and Helena 7 days later.

City	Distance	Date	Difference
Regina	235 km	24 May – 16 June	6 days earlier
Edmonton	484 km	3 June – 16 June	4 days later
Calgary	525 km	3 June – 11 June	4 days later
Winnipeg	711 km	24 May – 22 June	6 days earlier
Billings	719 km	11 May – 24 June	19 days earlier
Helena	727 km	6 June – 13 June	7 days later

Where to buy tomato plants and seeds near Saskatoon

Buy plants ready to set out from 30 May to 16 June (from 9 May to 16 June for an unheated greenhouse); seed for raising your own is sown from 18 March to 25 April. Within 15 km of Saskatoon OpenStreetMap lists 7 garden centres, 1 farm-supply shop, 1 plant nursery, 2 markets and 1 farm shop (collected 20 October 2026).

Wilson's Greenhouse — garden centre
Owen Manor 303, S7K 0P1 Saskatoon · Mon–Wed 10:00–18:00; Thu, Fri 10:00–20:00; Sat 10:00–18:00; Sun 11:00–17:00 · 8 km · wilsonslifestyle.ca
Early's Farm & Garden Centre Inc. — garden centre
Lorne Avenue 2615, S7J 0S5 Saskatoon · 4 km · earlysgarden.com
Early's — garden centre
51st Street East 502 · Mon–Sat 08:30–17:30 · 5 km · earlysgarden.com
Hi-Way Greenhouse — garden centre
11th Street West 2001 · 3 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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