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🥦 Growing Cauliflower in Zone 9b

Zone 9b has warm winters and an extended growing season — excellent for heat-loving crops like Cauliflower. Last frost: Mar 10. First frost: Nov 15.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 27Nov 15

Season: Mar 10 – Nov 15 (250 days)

Zone9b

Last FrostMar 10

First FrostNov 15

Season Length250 days

Days to Harvest75

SunFull Sun

Frost ToleranceModerate

Spacing1/sqft (12" apart)

When to Plant Cauliflower in Zone 9b

Start Seeds Indoors: Jan 27

Start Cauliflower seeds indoors around Jan 27 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.

Transplant Outdoors: Feb 24

Transplant Cauliflower seedlings outdoors after Feb 24. Wait until soil temperature reaches 50°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Apr 25

First harvest approximately Apr 25 (~60 days from transplant). Continue harvesting until first frost (Nov 15).

Fall Planting: Aug 23

For a fall harvest, plant Cauliflower around Aug 23 (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

Frequently Asked Questions

When should I plant Cauliflower in Zone 9b?

Start Cauliflower seeds indoors around Jan 27. Transplant outdoors after Feb 24. Expect first harvest around Apr 25.

What is the last frost date for Zone 9b?

The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.

Can I grow Cauliflower in Zone 9b?

Yes. Cauliflower needs 75 days to harvest. Zone 9b has a 250-day growing season, which is sufficient.

What is the best month to plant Cauliflower in Zone 9b?

The best time to start Cauliflower in Zone 9b is Jan. Begin seeds indoors around Jan 27, then transplant outdoors after the last frost date of Mar 10.

What companion plants grow well with Cauliflower?

Good companion plants for Cauliflower include Spinach, Celery, Thyme, Beans. Avoid planting Cauliflower near Tomatoes, Strawberries, Peas.

How long does Cauliflower take to harvest?

Cauliflower takes approximately 75 days from planting to harvest. In Zone 9b, expect your first harvest around Apr 25.

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