When to Plant Carrots in Hawaii
Published: April 21, 2026
Hawaii gardeners in Zone 12a have essentially year-round growing for carrot. Cool-season crops like carrot are best planted in the cooler winter months (October through February) — summer heat prevents these plants from heading or forming a harvestable crop. This guide gives exact dates for Hawaii based on your local frost calendar.
Carrot Planting Dates for Hawaii
| Last frost (average) | Frost-free |
| Transplant outdoors | Year-round (October–March is primary window) |
| Direct sow outdoors | Year-round (October–March is primary window) |
| Expect first harvest | 45–120 days after planting |
| Fall crop start | October |
| Fall harvest | January–March |
| First fall frost (average) | Frost-free |
Growing Carrots in Hawaii's Climate
Hawaii's tropical climate gives carrot year-round potential, but not all months are equal. Wet season (May through October in most of Hawaii) brings disease pressure that can destroy a carrot crop within days if fungal conditions align. Dry season (November through April) is the primary productive window.
Soil drainage matters more in tropical climates than almost anywhere else. Raised beds or heavily amended beds with 50% compost content drain rainfall quickly and keep carrot roots oxygenated during heavy storms. Flat beds in native clay soil often fail the first wet season.
Common carrot pests to watch for in Hawaii include Carrot Fly and Wireworm. The first line of defense is companion planting: Tomato and Onion planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Carrot Garden Calendar for Hawaii
| Month | Task | Notes |
|---|---|---|
| January | First harvests | Early transplants reach harvest size |
| February | Main harvest month | Peak production month in tropical climate |
| March | Continue harvests | Last window for new plantings before wet season |
| April | Finish harvests | Wet season approaching — harvest ripe crops |
| May | Clear beds | Disease pressure rises with wet season; warm-season ornamentals now |
| June ← | — | |
| July | — | |
| August | — | |
| September | — | |
| October | Prime planting window opens | Direct sow or transplant carrot; dry season begins |
| November | Main planting month | Peak planting window for best harvests |
| December | Continue successions | Plant every 2–3 weeks for staggered harvest |
Carrot Growing Tips for Hawaii Gardeners
- •Direct sow ONLY — transplanting carrots causes forked, misshapen roots every time.
- •Soil must be loose and rock-free to at least 12 inches deep; raised beds are ideal.
- •Hawaii's tropical climate favors planting carrot in dry season (October through April). Wet season plantings are destroyed by fungal disease within weeks.
- •Thin to 3-inch spacing aggressively — crowded carrots fork and grow stunted.
Companion Planting for Carrots in Hawaii
In Hawaii's tropical climate, planting carrot with Tomato and Onion helps deter pests and improve soil. Avoid planting near Dill and Parsnip, which inhibit carrot growth through root chemistry or shared pest pressure. See the full carrot companion planting guide for the complete list.
Carrots Planting Dates by City in Hawaii
Top cities in Hawaii — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant carrot in Hawaii?
In Hawaii (Zone 12a), direct sow carrot around Year-round (October–March is primary window) — 4 weeks before the state's average last frost of Frost-free.
What is the last frost date in Hawaii?
Hawaii's average last frost date is Frost-free in the state's most common Zone 12a. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow carrot year-round in Hawaii?
Yes, Hawaii's frost-free climate supports year-round carrot growing. October through March is the primary productive window; summer heat and wet-season fungal pressure limit what you can grow June through September.
What carrot varieties grow best in Hawaii?
For Hawaii's Zone 12a, Nantes-type carrots and Imperator varieties handle heat better than short-rooted types.
When do I start carrot seeds indoors in Hawaii?
Carrot does not need indoor starting in Hawaii — direct sow around Year-round (October–March is primary window) once soil reaches 45°F. Indoor starting is not recommended for this crop because carrot transplants poorly.