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Can You Grow Cauliflower in Ontario?

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

Grows well here

Cauliflower grows well here if you time it for your cool season — fall crops are often more reliable than spring.

Plant zones

2a–11b

Ontario last frost

mid-April

Ontario first frost

mid-October

Days to harvest

60–100 days

When to plant Cauliflowers in Ontario

Start indoors

Mar 3

Transplant

Apr 15

Harvest

Jun 14 – Jul 24

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

About Cauliflower

Cauliflower is one of the most rewarding cool-season brassicas — and one of the trickiest. It forms a dense white head that needs steady cool weather and consistent moisture.

Start indoors 6 weeks before last frost; transplant 2-3 weeks before last frost. Blanch heads by tying leaves over them once they're 2-3 inches across. Harvest before curds loosen.

Full cauliflower 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.