When to plant cucumbers in Trois-Rivières: 31 May – 14 August

In Trois-Rivières, cucumber: sow for seedlings from 12 April to 17 July; plant into a greenhouse from 10 May to 14 August; plant out into open ground from 31 May to 14 August. For plants and seeds, the places nearby include Maison Chaleur et Confort (garden centre, 6 km) and Ferme horticole Gagnon (farm shop, 8 km); addresses and opening hours are below.

Cucumber in Trois-Rivières: soil, season and weather

In Trois-Rivières the soil, not frost, sets the date: the last frost is over around 29 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 31 May, 32 days later.

Last spring frost	29 April
Top 7 cm of soil at 18 °C	31 May, 32 days after the last frost
Into an unheated greenhouse	10 May – 14 August; May outside: 7.9 °C at night, 19.2 °C by day; card 18–25 °C
First autumn frost	29 October, 151 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	4 July – 17 September
Days left for picking	117
Daylight	14:26 on 3 May, 15:31 on 31 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, September, has 9 rainy days

The same dates in Trois-Rivières hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in Trois-Rivières: care after planting

Planted on 31 May: in the first weeks water every 4 days.

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

7 June — feed: nitrogen

Pests and diseases of cucumber 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 Trois-Rivières during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 26.2 °C. Months that stay below 18 °C even by day on average: October (14.4 °C). Nights average below 18 °C in every month of the season, from 6.3 °C to 17 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.2	7.9	93	12	14:58
June	23.6	13.7	125	14	15:47
July	26.2	17	130	15	15:27
August	24.8	15.9	131	14	14:13
September	21	12	78	9	12:36
October	14.4	6.3	117	12	10:59

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Trois-Rivières, Montreal is 1 day earlier and Saguenay 32 days later.

City	Distance	Date	Difference
Quebec City	114 km	21 June – 13 August	21 days later
Sherbrooke	116 km	18 June – 12 August	18 days later
Montreal	123 km	30 May – 17 August	1 day earlier
Burlington	213 km	1 June – 19 August	1 day later
Montpelier	231 km	20 June – 2 August	20 days later
Saguenay	257 km	2 July – 7 August	32 days later

Where to buy cucumber plants and seeds near Trois-Rivières

Buy plants ready to set out from 31 May to 14 August (from 10 May to 14 August for an unheated greenhouse); seed for raising your own is sown from 12 April to 17 July. Within 15 km of Trois-Rivières OpenStreetMap lists 1 garden centre, 2 farm-supply shops, 1 market and 2 farm shops (collected 20 October 2026).

Ferme horticole Gagnon — farm shop
Chemin Sainte-Marguerite 8620 · 8 km
Jardins Dugré — farm shop
Rang Saint-Charles 3861 · 13 km
Maison Chaleur et Confort — garden centre
Boulevard Thibeau 1015, G8T 7B3 Trois-Rivières · Tue, Wed, Fri 09:00–17:30; Thu 09:00–20:00; Sat 09:00–16:00 · 6 km · maisonchaleuretconfort.com
RDR Grains et Semences — farm supply
Rang des Soixante 3680, J3T 1P4 Nicolet · 9 km · semencesrdr.com

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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