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Can You Grow Sweet Potato in Ontario?

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

Grows well here

Sweet potatoes grow well here — they love the warm season your zone provides.

Plant zones

5a–11b

Ontario last frost

mid-April

Ontario first frost

mid-October

Days to harvest

90–120 days

When to plant Sweet Potatoes in Ontario

Direct sow

Apr 15

Harvest

Jul 14 – Aug 13

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

About Sweet Potato

Sweet potatoes need a long warm season and thrive in heat — they are a subtropical crop at heart.

Plant slips (rooted cuttings) after soil warms to 18°C. They sprawl — give them space or train vertically. Cure harvested tubers at 30°C for a week to develop sweetness and improve storage.

Full sweet potato 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.