When to plant swiss chard in Hawaii
Hawaii is essentially frost-free (USDA zones 9b, 10a, 10b, 11a, 11b, 12a, 12b, 13a), so swiss chard timing there is set by heat and daylength rather than frost. As a cool-season crop, it does best in the cooler months (roughly October–March) and tends to bolt in summer heat.
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 swiss chard in Hawaii: the short answer
For a spring planting, sow Jan 13 – Feb 1, with seeds started indoors Dec 28 – Jan 11. Seeds germinate in soil from 40 to 85°F.
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.
Cool-season crop: in a frost-free area grow it in the cooler months (roughly October to March) and expect bolting in summer heat.
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 swiss chard in Hawaii, step by step
- Start seeds indoors (Dec 28 – Jan 11). Sow seeds 0.75 inch deep in seed-starting mix under bright light. They take 5-14 days to sprout, fastest in soil around 70°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs six or more hours of sun for the best growth, though four to six hours in partial shade is enough and loose soil at least 12 inches deep, with a pH between 6.0 and 7.5. Dig in compost before planting.
- Sow outdoors (Jan 13 – Feb 1). Space plants about 9 inches apart in rows 18 inches apart, sowing seed 0.75 inch deep. It tolerates a light frost but not a hard freeze. As a cool-season crop it does best before summer heat arrives in Hawaii.
- 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: leaf miner, aphids, flea beetle. Diseases and disorders: cercospora leaf spot, downy mildew.
- Harvest (from about Mar 9 – Mar 19). Swiss Chard takes 50-60 days to reach harvest. One of the most heat-tolerant leafy greens - a single spring sowing usually carries through summer into fall if kept picked.
Figures come from our crop data; dates use Hawaii’s average frost dates. More in the full swiss chard growing guide.