When to plant zucchini in Quebec City: 21 June – 11 August

In Quebec City, zucchini: sow for seedlings from 10 May to 21 July; plant into a greenhouse from 31 May to 11 August; plant out into open ground from 21 June to 11 August.

Zucchini in Quebec City: soil, season and weather

In Quebec City the soil, not frost, sets the date: the last frost is over around 5 May, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 21 June, 47 days later.

Last spring frost	5 May
Top 7 cm of soil at 18 °C	21 June, 47 days after the last frost
First autumn frost	28 October, 129 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	27 July – 16 September
Days left for picking	93
Daylight	15:34 on 31 May, 15:52 on 21 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 11 rainy days

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

Zucchini in Quebec City: care after planting

Planted on 21 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Quebec City during the zucchini season

About 678 mm of rain falls in the season; September is the driest month (101 mm) and July the wettest (161 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.6	12.6	144	13	15:51
July	25.4	16.2	161	16	15:31
August	24.2	15.3	144	15	14:15
September	20.2	11.1	101	11	12:37
October	13.3	5.4	128	12	10:58

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Quebec City, Montreal is 22 days earlier and Saguenay 11 days later.

City	Distance	Date	Difference
Trois-Rivières	114 km	31 May – 12 August	21 days earlier
Sherbrooke	165 km	18 June – 10 August	3 days earlier
Saguenay	180 km	2 July – 5 August	11 days later
Montreal	233 km	30 May – 15 August	22 days earlier
Bangor	288 km	25 June – 17 August	4 days later
Augusta	299 km	22 June – 17 August	1 day later

Where to buy zucchini plants and seeds near Quebec City

Buy plants ready to set out from 21 June to 11 August (from 31 May to 11 August for an unheated greenhouse); seed for raising your own is sown from 10 May to 21 July. Within 15 km of Quebec City OpenStreetMap lists 6 garden centres, 1 farm-supply shop and 3 markets (collected 20 October 2026).

The Artisans of the Quebec Cathedral — market
Mon–Sun 10:00–18:00 · 0 km · facebook.com
Pépinière Arboréal — garden centre
15 km
Centre jardin Bourbeau — garden centre
8 km
Rue du Trésor — market
1 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.

Questions