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.

SoilCommander Editorial Team

Canada vegetable growing guides · Checked against Agriculture and Agri-Food Canada plant hardiness data

Every Canadian growing guide is written and maintained by our editorial team for real Canadian growing conditions, and checked against Agriculture and Agri-Food Canada hardiness and frost-date data and provincial agriculture guidance before publication.

Early Sep

First frost, Prairies and North

Garlic

Plant now in Central Canada

Row cover

Adds 2-4 weeks of harvest

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

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 20C with flavour equal to vine-ripened fruit. Pick before the first frost.

Last updated 25 August 2026

Relevant next steps

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.

Printable garden plannerRecord this month's sowing dates, crop rotation, and bed tasks. Seed starting setupChoose trays, labels, compost, and indoor sowing tools before you start. Full planting calendarCompare this month with the rest of the UK growing year.

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.

Get Planner

What to Plant in September Canada