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Can You Grow Sunflower in Idaho?

US · USDA Zone 6b · zones 3b, 4a, 4b, 5a, 5b, 6a, 6b

Grows well here

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

Plant zones

2a–11b

Idaho last frost

mid-March

Idaho first frost

mid-November

Days to harvest

60–80 days

When to plant Sunflowers in Idaho

Direct sow

Mar 15

Harvest

May 14 – Jun 3

Dates are approximate, based on Idaho'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 Idaho

Idaho has a semi-arid continental climate. Southern valleys are Zone 6-7 with hot dry summers; northern regions and mountains are colder. Excellent for root vegetables and cool crops.