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Can You Grow Sunflower in New Hampshire?

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

Grows well here

Sunflowers grow brilliantly here — they love the warm season and produce quickly.

Plant zones

2a–11b

New Hampshire last frost

early April

New Hampshire first frost

late October

Days to harvest

60–80 days

When to plant Sunflowers in New Hampshire

Direct sow

Apr 7

Harvest

Jun 6 – Jun 26

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

About Sunflower

Sunflowers are fast-growing cheerful and attract pollinators — some varieties produce edible seeds.

Direct sow after last frost in the sunniest spot available. No transplanting needed. Giant varieties need staking. Harvest seed heads when the back turns brown and seeds are firm.

Full sunflower 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 Sunflower in New Hampshire?

Sunflowers grow brilliantly here — they love the warm season and produce quickly.

What zone is New Hampshire?

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

When do you plant Sunflowers in New Hampshire?

Plant Sunflowers Apr 7, harvest Jun 6 – Jun 26.