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Can You Grow Corn in Ontario?

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

Grows well here

Corn grows well here — plant in blocks after last frost for a summer harvest.

Plant zones

3b–11b

Ontario last frost

mid-April

Ontario first frost

mid-October

Days to harvest

60–90 days

When to plant Corn in Ontario

Direct sow

Apr 15

Harvest

Jun 14 – Jul 14

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

About Corn

Corn needs space warmth and wind-pollination — plant in blocks not rows for good pollination.

Direct sow after soil reaches 16°C. Plant in a 4x4 block minimum for wind pollination. Needs consistent water especially during tasselling. Not suitable for containers.

Full corn 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.