When to plant sunflower in Hawaii
Hawaii spans USDA zone 12a, so the right time to plant sunflower shifts by weeks across the state. The window to sow seed directly outdoors runs from about January 26 in Kapaa to January 26 in Kapaa — below are local dates for 1 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Kapaa | 12a | January 26 | January 24 | January 26 – February 16 |
Sunflower in Hawaii: FAQ
When can I plant sunflower in Hawaii?
Across Hawaii, the time to direct-sow sunflower spans roughly January 26 in Kapaa to January 26 in Kapaa, each following that city's local frost dates.
Does the sunflower planting date vary across Hawaii?
Yes. Hawaii publishes 1 cities with their own frost dates, so the right sunflower planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does sunflower take to grow in Hawaii?
Sunflower takes about 70–100 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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