Hawaii planting calendar
Most of Hawaii falls in USDA hardiness zones 9a–13b. Your exact zone depends on your local area — look it up by ZIP code — then open your zone's month-by-month calendar below.
USDA hardiness zones in Hawaii
| Zone | Coldest temps | Avg. last spring frost |
|---|---|---|
| Zone 9a | 20 to 25°F | Feb 28 |
| Zone 9b | 25 to 30°F | Feb 15 |
| Zone 10a | 30 to 35°F | Jan 31 |
| Zone 10b | 35 to 40°F | Jan 15 |
| Zone 11a | 40 to 45°F | Jan 1 |
| Zone 11b | 45 to 50°F | Jan 1 |
| Zone 12a | 50 to 55°F | Jan 1 |
| Zone 12b | 55 to 60°F | Jan 1 |
| Zone 13a | 60 to 65°F | Jan 1 |
| Zone 13b | 65 to 70°F | Jan 1 |