When to plant watercress in Hawaii
Hawaii spans USDA zone 12a, so the right time to plant watercress shifts by weeks across the state. The window to sow seed directly outdoors runs from about January 12 in Kapaa to January 12 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 12 – February 9 |
Watercress in Hawaii: FAQ
When can I plant watercress in Hawaii?
Across Hawaii, the time to direct-sow watercress spans roughly January 12 in Kapaa to January 12 in Kapaa, each following that city's local frost dates.
Does the watercress planting date vary across Hawaii?
Yes. Hawaii publishes 1 cities with their own frost dates, so the right watercress 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 watercress take to grow in Hawaii?
Watercress takes about 45–60 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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