When should I plant Cauliflower in Zone 9a?

Start Cauliflower seeds indoors around Feb 6. Transplant outdoors after Mar 6. Expect first harvest around May 5.

What is the last frost date for Zone 9a?

The average last spring frost date for Zone 9a is Mar 20. The first fall frost averages Nov 12, giving a 237-day growing season.

Can I grow Cauliflower in Zone 9a?

Yes. Cauliflower needs 75 days to harvest. Zone 9a has a 237-day growing season, which is sufficient.

🥦

🥦 Growing Cauliflower in Zone 9a

Zone 9a has warm winters and an extended growing season — excellent for heat-loving crops like Cauliflower. Last frost: Mar 20. First frost: Nov 12.

Planting Calendar

Indoor

Outdoor

Harvest

Feb 6Nov 12

Season: Mar 20 – Nov 12 (237 days)

Zone9a

Last FrostMar 20

First FrostNov 12

Season Length237 days

Days to Harvest75

SunFull Sun

Frost ToleranceModerate

Spacing1/sqft (12" apart)

When to Plant Cauliflower in Zone 9a

Start Seeds Indoors: Feb 6

Start Cauliflower seeds indoors around Feb 6 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.

Transplant Outdoors: Mar 6

Transplant Cauliflower seedlings outdoors after Mar 6. Wait until soil temperature reaches 50°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: May 5

First harvest approximately May 5 (~60 days from transplant). Continue harvesting until first frost (Nov 12).

Fall Planting: Aug 20

For a fall harvest, plant Cauliflower around Aug 20 (12 weeks before first frost).

Companion Planting

✅ Spinach ✅ Celery ✅ Thyme✅ Beans

❌ Tomatoes❌ Strawberries❌ Peas

Cauliflower in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Plan Your Cauliflower Garden

Track Cauliflower from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Cauliflower Growing Guide