USDA Zone 11 planting calendar
When to plant swiss chard in USDA zone 11
Sowing, transplant, and harvest dates calibrated to zone 11's 365-day season (Florida Keys, Hawaii (most), Puerto Rico, southern California (coastal)).
Key dates for swiss chard in zone 11
| Stage | When | Anchor |
|---|---|---|
| Direct sow outdoors | October — February (the cool dry season is your spring) | No frost — plant in the cool months |
| First harvest (estimate) | ~55 days after sowing | ~55 days from sow |
Dates are zone-wide averages. Local microclimates (south-facing slopes, urban heat, lakeside warmth, elevation) can shift the planting window by 1-2 weeks within the same zone.
Why this timing works for zone 11
Zone 11 has average annual minimum temperatures of 40 to 50°F and a 365-day frost-free window from no frost to no frost. Swiss Chard are hardy enough to handle light frost — and in fact prefer cool weather. They bolt or turn bitter once daytime temperatures consistently climb above 24 °C, which is why earlier is better in zone 11.
Swiss chard is notably more versatile than spinach — it tolerates both light frost (surviving to about -4 °C) and summer heat up to 32 °C, making it a near-year-round crop in Zones 7–10. Direct-sow or transplant 1 week before the last spring frost; chard seed is actually a multi-germ cluster, so thin to final spacing after germination to prevent overcrowding. Unlike spinach, it does not readily bolt in summer, so a single sowing can be harvested by cutting outer leaves repeatedly for 3–4 months.
Quick-grow guide
- Sun: Full sun to partial shade.
- Soil temperature for germination: 10-29 °C (50-85 °F).
- Spacing: 9-12 inches (23-30 cm) between plants.
- Days to harvest from direct sow: ~55 days.
- Plant in cool weather and provide afternoon shade once temperatures climb above 24 °C.
Common mistakes — zone 11 × swiss chard
- Spring planting: zone 11 springs are too short — sow swiss chard in autumn for a winter and early-spring harvest instead.
- Waiting for "warm" soil — these crops germinate at 7-10 °C and bolt the moment summer heat sets in.
Source and methodology
Frost-date averages from NOAA Climate Data Online within each USDA hardiness zone. Hardiness zone boundaries from the USDA Plant Hardiness Zone Map (2023). Crop timing offsets calibrated against US Cooperative Extension Service publications (UNL, UMN, NC State, Texas A&M, UF/IFAS) and cross-checked against the RHS sowing calendar for en-GB readers. Curated by the Growli editorial team.
Keep going
- How to grow swiss chard — full guide
- USDA Zone 11 — frost dates and what else to plant
- All 13 USDA hardiness zones
Same crop, nearby zones
- When to plant swiss chard in USDA zone 9
- When to plant swiss chard in USDA zone 10
- When to plant swiss chard in USDA zone 12
- When to plant swiss chard in USDA zone 13