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Outdoor cannabis seeds for Canada
Feminized, autoflowering and CBD strains from a Quebec seed bank, selected for short summers and cool nights. Free seeds with every order.
September harvest
The best choice for Canada and other northern climates.
October harvest
Pick the right strain: October brings night frosts.
Mold tolerance
For a late harvest, you need mold-tolerant genetics — no strain is fully mold-resistant.
Free seeds, every order
Orders over $200 also ship free across Canada and to the USA.
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Outdoor seeds in Canada: common questions
Which outdoor strains are best for Canada?
For Canada and other northern climates, the best choice is a strain that is harvested in September. September harvest strains are the ideal fit.
Can I grow a strain that finishes in October?
Yes, but you have to pick the right strain. October brings night frosts, and you need mold-tolerant genetics — no strain is fully mold-resistant. See our October harvest strains.
Do you ship outdoor seeds across Canada?
Yes. Quebec Cannabis Seeds ships from Quebec across Canada and to the USA. Orders over $200 ship free, and every order includes free seeds.
When should I plant cannabis outdoors in Canada
Transplant after the last frost, usually late May to early June, once soil temperature is above 12 degrees. Start seeds indoors in April so plants are established before they go out.
How long is the outdoor season
Roughly 130 frost-free days in zone 5 and about 110 in zone 4. That is short enough that choosing a strain by harvest month matters more here than almost anywhere else.
What goes wrong most often outdoors
Cold September nights and autumn rain on dense flowers. Nights below about 15 degrees slow the plant down, and a wet week on tight buds invites rot. Airflow and a cover you bought before you needed it are the defences.
Are autoflowers better for an outdoor grow
For a short season or an uncertain spot, often yes. They flower on age rather than daylight, so you can plant in June and harvest in August, before the weather turns.
Can I move plants under cover
Fabric pots make this possible and it saves more crops than any other single measure. Being able to pull plants in for one cold night or one wet weekend changes the odds considerably.
Do outdoor plants need to be hidden from view
Several provinces require plants not be visible from public space, and rules differ by province. Check your own provincial rules before planting. Home cultivation is prohibited entirely in Quebec.
How do I know when to harvest
Judge by the trichomes rather than the calendar: mostly cloudy for a brighter effect, some amber for a heavier one. Outdoors, harvest ahead of a hard frost rather than racing it.
Grower guides
- When to plant cannabis outdoors in Canada — frost dates, timing and how to beat a short season
- How to get big yields outdoors — soil, sun and spacing choices that move the final weight
- Quarter pound to ounces, converted — the weights growers actually use, with a conversion table
Read more about outdoor seeds
Looking for outdoor cannabis seeds? Quebec Cannabis Seeds offers one of the largest selections of cannabis seeds in Quebec and across Canada. Our genetics are shaped by our founder’s more than 35 years of personal, hands-on growing and breeding experience, with a strong focus on performance in real-world outdoor conditions.
We offer a wide range of feminized, autoflowering, and CBD genetics, including vigorous outdoor varieties, high-yielding selections, and strains with distinctive phenotypes and characteristics.
Growing cannabis outdoors in Canada comes with unique challenges, including short summers, cooler nights, changing weather, and high humidity. That is why many of our strains are selected and developed with the harsh Canadian climate in mind, helping growers choose genetics better suited to northern growing conditions.
Is QCS’s outdoor, climate-adapted genetics claim backed by real results?
Yes — see our analysis of 400+ public grow diaries from independent growers, including real outdoor yields and some failures, in What 400+ Grower Reports Told Us About Growing Our Seeds in Canada.
New to a northern season? Our guide to when to plant cannabis outdoors in Canada covers the month-by-month calendar, how to pick a strain by harvest month, and what actually goes wrong.