When to plant pumpkins in Hawaii
Hawaii is essentially frost-free (USDA zones 9b, 10a, 10b, 11a, 11b, 12a, 12b, 13a), so pumpkin timing there is set by heat and daylength rather than frost. As a warm-season crop, the main risk is mid-summer heat — spring and late-summer plantings usually do best.
Hawaii covers a wide range of climates, so your exact frost dates may differ from the state average by two weeks or more. For dates tuned to your town, use the calendar generator.
When to plant pumpkins in Hawaii: the short answer
For a spring planting, sow Feb 3 – Feb 22, with seeds started indoors Jan 4 – Jan 18. Wait until the soil is at least 60°F and frost is over. For Halloween, count back 90–120 days from October 31: sow by Jul 3–Aug 2. See the Halloween plan.
Your area is essentially frost-free, so planting dates are set by heat and daylength rather than frost. Treat the ranges below as broad season guides.
Warm-season crop: in a frost-free area the main risk is mid-summer heat; spring and late-summer plantings usually do best.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow pumpkins in Hawaii, step by step
- Start seeds indoors (Jan 4 – Jan 18). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 5.5 and 7.5. Dig in compost before planting.
- Sow outdoors (Feb 3 – Feb 22). Space plants about 48 inches apart in rows 96 inches apart, sowing seed 1 inch deep. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: squash vine borer, squash bug, striped cucumber beetle. Diseases and disorders: powdery mildew, bacterial wilt.
- Harvest (from about May 9 – Jun 8). Pumpkin takes 90-120 days to reach harvest. For Halloween pumpkins in the north, count back 100-120 days from 31 Oct and start indoors. Mini varieties can climb a strong trellis.
Figures come from our crop data; dates use Hawaii’s average frost dates. More in the full pumpkin growing guide.
Planting pumpkins in Hawaii for Halloween
Spring dates above suit a long season. If you want fruit ready for Halloween, count back from Halloween (October 31). Pumpkin takes 90–120 days from sowing to a mature fruit, so these are the latest sowing dates. Sow earlier for a margin, but not too early: the University of Arkansas Extension warns that pumpkins planted too early may rot before Halloween.
| Days to maturity | Latest sowing for Halloween | Typical for |
|---|---|---|
| 120 days | July 3 | slowest types (giants) |
| 100 days | July 23 | jack-o'-lantern and pie types (University of Arkansas variety table) |
| 90 days | August 2 | quickest types |
See the full growing guide for pumpkin. Days to maturity vary by variety, so check the seed packet.