USDA Zone 11 planting calendar
When to plant celery 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 celery 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) | ~115 days after sowing | ~115 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. Celery 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.
Celery is one of the most demanding cool-season crops: it germinates slowly at 15-21 °C and needs 10-12 weeks of indoor growing time before transplanting out 2-4 weeks before the last spring frost. Temperatures below 10 °C for more than 10 consecutive days can trigger premature bolting, so protect young transplants with row cover in cold snaps. In zones 9-10 celery is typically grown as a winter/spring crop, started in late summer; in zones 3-6 the short cool window before summer heat sets in makes consistent irrigation and blanching (hilling or wrapping stems) essential for tender, mild stalks.
Quick-grow guide
- Sun: Full sun — 6+ hours direct.
- Soil temperature for germination: 15-21 °C (60-70 °F).
- Spacing: 8-12 inches (20-30 cm) between plants.
- Days to harvest from direct sow: ~115 days.
- Plant in cool weather and provide afternoon shade once temperatures climb above 24 °C.
Common mistakes — zone 11 × celery
- Spring planting: zone 11 springs are too short — sow celery 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 celery — full guide
- USDA Zone 11 — frost dates and what else to plant
- All 13 USDA hardiness zones
Same crop, nearby zones
- When to plant celery in USDA zone 9
- When to plant celery in USDA zone 10
- When to plant celery in USDA zone 12
- When to plant celery in USDA zone 13