USDA Zone 11 planting calendar
When to plant zucchini 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 zucchini in zone 11
| Stage | When | Anchor |
|---|---|---|
| Plant outdoors | year-round (avoid the hottest 6-8 weeks of summer for heat-sensitive varieties) | No frost — plant in the cool months |
| First harvest (estimate) | ~55 days after planting | ~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. Zucchini are tender — they need soil above 16 °C to grow and stop fruiting once nights drop below 10 °C. That puts the safe outdoor planting window after the last spring frost passes, and the harvest closes when fall temperatures arrive.
Zucchini is the fastest-maturing summer squash — soil must reach 18 °C (65 °F) before sowing or transplanting, as cold soil causes slow, weak germination and root rot. One or two plants per family member is usually sufficient; succession-sowing every 3-4 weeks extends harvest but rarely necessary given prolific production. Harvest fruit at 15-20 cm (6-8 inches) every 2-3 days to maintain plant productivity; leaving fruits to overgrow reduces total yield.
Quick-grow guide
- Sun: Full sun — 6-8 hours direct.
- Soil temperature for germination: 21-29 °C (70-85 °F).
- Spacing: 24-36 inches (60-90 cm) between plants.
- Days to harvest from direct sow: ~55 days.
- Wait until night temperatures stay above 10 °C — cold soil stunts warm-season crops permanently.
Common mistakes — zone 11 × zucchini
- Planting in midsummer: zone 11's July-August heat shuts down fruit set — run a spring crop (transplant by year-round (avoid the hottest 6-8 weeks of summer for heat-sensitive varieties)) and a fall crop instead.
- Choosing cold-zone varieties — pick heat-tolerant cultivars (Solar Fire, Heatwave II for tomatoes; Carolina Reaper-tolerant heritage peppers) bred for zone 11.
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 zucchini — full guide
- USDA Zone 11 — frost dates and what else to plant
- All 13 USDA hardiness zones
Same crop, nearby zones
- When to plant zucchini in USDA zone 9
- When to plant zucchini in USDA zone 10
- When to plant zucchini in USDA zone 12
- When to plant zucchini in USDA zone 13