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Can You Grow Collard Greens in Ontario?

Canada · Canadian Zone 5 · zones 3, 4, 5, 6, 7

Grows well here

Collards are well-suited to your zone — they handle summer heat and frost alike.

Plant zones

5a–11b

Ontario last frost

mid-April

Ontario first frost

mid-October

Days to harvest

60–80 days

When to plant Collard Greenses in Ontario

Start indoors

Mar 18

Transplant

Apr 15

Harvest

Jun 14 – Jul 4

Dates are approximate, based on Ontario's average frost dates. Your exact yard may vary by microclimate.

About Collard Greens

Collard greens are a Southern staple — extremely hardy, tolerating both frost and summer heat better than most brassicas. Rich in nutrients and one of the most productive greens per square foot.

Start indoors 4-6 weeks before last frost or direct sow. Harvest lower leaves as needed. Plants withstand hard frosts — flavor improves after cold snaps. In warm zones, grow as a fall/winter crop.

Full collard greens growing guide →

Gardening in Ontario

Ontario spans several climate zones. Northern Ontario is Zone 3-4 with short seasons; southern Ontario is Zone 5-7 with long productive seasons. The Niagara Peninsula is one of Canada's premier fruit-growing regions.