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Can You Grow Sweet Potato in New Hampshire?

US · USDA Zone 5b · zones 4a, 4b, 5a, 5b, 6a

Grows well here

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

Plant zones

5a–11b

New Hampshire last frost

early April

New Hampshire first frost

late October

Days to harvest

90–120 days

When to plant Sweet Potatoes in New Hampshire

Direct sow

Apr 7

Harvest

Jul 6 – Aug 5

Dates are approximate, based on New Hampshire'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 New Hampshire

New Hampshire has a humid continental climate. Coastal areas are Zone 5b-6a; northern mountains are Zone 4a-5a. Short growing seasons but productive for cool-season crops and berries.

See what grows well in New Hampshire →

Frequently asked questions

Can you grow Sweet Potato in New Hampshire?

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

What zone is New Hampshire?

New Hampshire spans USDA Zone 5b (4a, 4b, 5a, 5b, 6a).

When do you plant Sweet Potatoes in New Hampshire?

Plant Sweet Potatoes Apr 7, harvest Jul 6 – Aug 5.