What to Plant in September Canada
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What to plant in September in Canada depends entirely on your zone — this page answers it for every band. September is the month the Canadian season ends in most of the country. Harvest and protect ahead of the first frost, plant garlic in Central Canada, and cure squash and onions for storage. On the coast, growing continues well into autumn.
September planting by region
| Band | Sow outdoors | Start indoors | Plant out | Harvest now |
|---|---|---|---|---|
|
Long season Zones 7-9 |
Overwintering greens, spinach, radish; garlic from mid-October. | Overwintering brassicas. | Overwintering brassica transplants. | Tomatoes, peppers, beans, squash, corn, apples. |
|
Medium season Zones 4-6 |
Fast greens under cover. | Nothing. | Garlic from mid-September. | Everything — tomatoes, squash, corn, beans, potatoes, roots. |
|
Short season Zones 2-3 |
Nothing. | Nothing. | Garlic mid-September. | Everything, urgently — frost is imminent or has arrived. |
September garden jobs
- Watch the forecast nightly and cover tender crops when frost threatens.
- Harvest winter squash before frost and cure it warm and dry.
- Ripen green tomatoes indoors rather than gambling on the weather.
- Plant garlic from mid-September in Central Canada and the Prairies.
- Record what grew where before you clear the beds.
Common September mistakes
- Being caught by the first frost without row cover ready.
- Leaving squash out through a frost, which ruins its storage life.
- Planting garlic too late on the Prairies, before roots can establish.
- Clearing beds without recording what was in them for next year's rotation.
Turn September's jobs into a written plan. The Canada Vegetable Garden Planner (printable PDF) has frost-date planning pages, bed layouts, crop rotation, a sowing log and a harvest tracker — 70 printable pages.
More Canada planting guides
- What to plant in August Canada
- What to plant in October Canada
- Vegetable Planting Calendar Canada
- Vegetable Growing Guides for Canada
Frequently Asked Questions
What should I do in September in Canada?
Harvest ahead of the first frost, cure squash and onions, plant garlic in Central Canada and the Prairies, and cover tender crops on cold nights.
When should I plant garlic in Canada?
Mid-September to early October across the Prairies and Central Canada, and mid-October on the Pacific coast. Garlic needs roots established but no top growth before hard freeze.
Will green tomatoes ripen indoors?
Yes. Any fruit that has reached the breaker stage ripens indoors at around 20°C with flavour equal to vine-ripened fruit. Pick before the first frost.
Plan your September beds
Turn this month's list into a layout: sketch your plot in the free Garden Layout Planner, then follow the whole season with the Canada Vegetable Garden Planner (printable PDF, 70 pages). For the full year, see the Canada vegetable planting calendar, browse every crop in the Canada growing guides, or use the Canada site directory.
Last updated 25 August 2026
Turn This Month's Jobs Into A Plan
Month-by-month advice works best when it becomes a written sowing list, bed plan, and follow-up task list.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.