When to plant tomatoes in St. John's: 26 June – 21 July

In St. John's, tomato: sow for seedlings from 14 April to 30 May; plant into a greenhouse from 5 June to 21 July; plant out into open ground from 26 June to 21 July. For plants and seeds, the places nearby include The Seed Company (garden centre, 1 km); addresses and opening hours are below.

Tomato in St. John's: soil, season and weather

In St. John's the soil, not frost, sets the date: the last frost is over around 19 May, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 26 June, 38 days later.

Last spring frost	19 May
Top 7 cm of soil at 15 °C	26 June, 38 days after the last frost
Into an unheated greenhouse	5 June – 21 July; June outside: 7.8 °C at night, 15 °C by day; card 16–27 °C
First autumn frost	10 November, 137 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	4 September – 29 September
Days left for picking	67
Daylight	14:39 on 5 May, 15:58 on 26 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 12 rainy days

Tomato in St. John's: care after planting

Planted on 26 June: in the first weeks water every 4 days.

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

26 June — feed: balanced (NPK)
24 July — 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 St. John's during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 20.3 °C. Months that stay below 16 °C even by day on average: June (15 °C), October (11.6 °C) and November (7.2 °C). Nights average below 16 °C in every month of the season, from 1.8 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	15	7.8	110	13	15:57
July	19.7	12.9	98	12	15:37
August	20.3	13.9	93	12	14:19
September	16.6	10.8	111	11	12:38
October	11.6	6.3	97	12	10:56
November	7.2	1.8	179	15	9:20

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than St. John's; the closest date is in Halifax, 7 days earlier.

City	Distance	Date	Difference
Charlottetown	805 km	13 June – 13 July	13 days earlier
Halifax	897 km	19 June – 20 July	7 days earlier
Moncton	933 km	9 June – 15 July	17 days earlier
Fredericton	1,077 km	5 June – 8 July	21 days earlier
Bangor	1,268 km	31 May – 14 July	26 days earlier
Augusta	1,365 km	27 May – 14 July	30 days earlier

Where to buy tomato plants and seeds near St. John's

Buy plants ready to set out from 26 June to 21 July (from 5 June to 21 July for an unheated greenhouse); seed for raising your own is sown from 14 April to 30 May. Within 15 km of St. John's OpenStreetMap lists 3 garden centres and 2 markets (collected 20 October 2026).

The Seed Company — garden centre
King's Road 88, A1C 6L7 St. John's · 1 km · theseedcompany.ca
St. John's Farmer's Market — market
Freshwater Road 245, St. John's · 2 km
Lester's Farm Market — market
"seasonal" · 7 km
Carew's Landscaping — garden centre
10 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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