Hawaii · zones 12a–12a
When to plant carrots in Hawaii.
Sow between Nov 24 to Dec 27 in a typical year, keyed to Hawaii's median last frost around Jan 1. A second, fall sowing fits Oct 5 to Oct 31. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Carrots dates for a typical Hawaii season.
Direct sow
Nov 24 to Dec 27
Keyed to the ~Jan 1 last frost. Sow 0.25" deep, 2" apart.
Fall round
Oct 5 to Oct 31
Counted back from the ~Dec 31 first frost.
Harvest
~68 days later
~0.2 lb per plant over ~2 weeks.
Hawaii spans more than one climate: Zone 12 is the most common zone, but the state runs 12a to 12a. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Hawaii growing notes
Carrots are the most forgiving of the five classic cool-season crops here: heat does not stop the root, though what the bed is made of can still ruin its shape.
Straight roots depend on the ground, not on any missing cool spell
Carrots go in direct-sown, a quarter inch deep, thinned to about 2 inches apart, with a root worth pulling around 68 days after seeding. That tight spacing only pays off if the ground lets a tapered root push straight down instead of forking around resistance. Hawaii's volcanic soils swing from loose and rich to broken lava fill to heavy clay within the same yard, and a carrot answers each one differently than a leafy crop would. Dig one up partway through the row: a smooth, tapered root means the ground is doing its job, while a forked or hairy one means a stone or a clay layer sat where the taproot wanted to go straight.
Because a single plant returns only about a fifth of a pound, the payoff comes from running many short rows back to back rather than one big planting. The calendar reflects that with as many as 15 separate sowings across the year rather than one spring crop and one fall crop; a fresh short row every few weeks keeps supply steady. Thin as soon as the first true leaves show; skipped thinning crowds roots into a tangle of skinny, bent carrots no matter how good the soil is.
A disease that answers to the site, not the season
Aphids and Alternaria leaf blight are the two pests tracked for carrots here, and Alternaria answers to where a bed sits more than to when it went in. The fungus needs water standing on a leaf to move from plant to plant, so a windward garden catching a shower most afternoons carries real pressure that a leeward bed drying out under open sky does not, even from the same seed packet sown the same day.
The disease shows first as dark, irregular spots on the oldest leaves that spread and merge until the leaf top browns and curls, usually starting near the tip and working back toward the crown. Because carrots run through as many as 15 separate sowings in the same stretch of ground, spent tops left to rot at the row's edge after pulling can hand the fungus straight to the planting going in a few weeks later. Clearing old foliage out of the bed matters more on that rotation than on a crop grown once a year and never followed by its own kind. Aphids cluster on the soft, ferny growth at the plant's center; a firm spray from the hose knocks most colonies back.
The real cool-season question here is flavor, not survival
Of the five classic cool-weather crops here, carrots are the one whose survival at sea level is not in doubt; the plant does not need cold to size up the way lettuce needs it to avoid bolting. What is worth checking instead is flavor: pull one from the middle of the row and taste it raw. Sweet and snappy means the bed is doing its job; flat or a little bitter is a reason to try a different bed or feeding schedule next round, not proof anything was done wrong. Whether a garden higher up grows a better-tasting carrot is worth testing side by side rather than assuming.
Variety helps at both ends of that. Kuroda types are sold for warm-climate growing, described by seed houses as bred to withstand tropical heat, which is fair reason to try one where a long slender type disappointed. Shape is a separate decision: a short, blunt Chantenay-class root handles shallow or heavy ground better than a long tapered Imperator, so a bed with a hard layer near the surface is where that form earns its keep. Neither choice replaces bed prep, and the ground still has to be worked free of clods and stones before seeding, because no variety grows straight through a stone.
In Hawaii: watch for
The pests that find carrots here.
With about 364 frost-free days, carrot spends longer in the ground here than in most of the country, which widens the window in which aphids can find it. Scout weekly from midseason and act on the first signs.
Brown spots ringed in yellow on the oldest leaves first, darkening until the tops look scorched.
Organic fix: Water at the base rather than overhead, turn under old carrot tops, and leave 2 years between carrot crops.
Your season math: Hawaii gives carrots about 364 frost-free days, and it needs roughly 68 days to a first harvest. That fits about 15 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting carrots in Hawaii: questions
When should I plant carrots in Hawaii?+
In a typical Hawaii year, sow carrots between Nov 24 to Dec 27, keyed to the state's median last frost around Jan 1. There's also a fall window: Oct 5 to Oct 31. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Hawaii?+
Hawaii spans zones 12a–12a, mostly zone 12. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many carrots plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.