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Can You Grow Sweet Potato in Maine?

US · USDA Zone 5a · zones 3b, 4a, 4b, 5a, 5b

Grows well here

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

Plant zones

5a–11b

Maine last frost

mid-April

Maine first frost

mid-October

Days to harvest

90–120 days

When to plant Sweet Potatoes in Maine

Direct sow

Apr 15

Harvest

Jul 14 – Aug 13

Dates are approximate, based on Maine'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 Maine

Maine has a cool humid continental climate. Coastal areas are Zone 5b-6a; inland and northern Maine is Zone 3b-4a. Short summers but excellent for potatoes, blueberries, and cool crops.