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Hawaii frost dates
At Mauna Loa 5 Nne, the average last spring frost is Apr 12 and the first fall frost Dec 1, about 233 frost-free days. Hardiness zones in these places: 11a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Mauna Loa 5 Nne | 11a | Apr 12 | May 18 | Dec 1 | 233 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Hawaii
Using the statewide middle dates (last frost Apr 12, first frost Dec 1). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Hawaii |
|---|---|
| Tomatoes | Apr 19 – May 3 |
| Peas | Mar 1 – Mar 22; fall: Sep 8 – Sep 29 |
| Potatoes | Mar 15 – Apr 5 |
| Green beans | Apr 19 – May 3; fall: Sep 15 – Sep 29 |
| Garlic | Dec 1 – Dec 29 |
| Tulips | Nov 17 – Dec 29 |