When should I plant Broccoli in Zone 10b?

Start Broccoli seeds indoors around Dec 17. Transplant outdoors after Feb 11. Expect first harvest around Apr 12.

What is the last frost date for Zone 10b?

The average last spring frost date for Zone 10b is Jan 28. The first fall frost averages Dec 22, giving a 328-day growing season.

Can I grow Broccoli in Zone 10b?

Yes. Broccoli needs 70 days to harvest. Zone 10b has a 328-day growing season, which is sufficient.

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🥦 Growing Broccoli in Zone 10b

Zone 10b has a year-round growing season. Broccoli can be planted almost any time with proper planning. Last frost: Jan 28. First frost: Dec 22.

Planting Calendar

Indoor

Outdoor

Harvest

Dec 17Dec 22

Season: Jan 28 – Dec 22 (328 days)

Zone10b

Last FrostJan 28

First FrostDec 22

Season Length328 days

Days to Harvest70

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Broccoli in Zone 10b

Start Seeds Indoors: Dec 17

Start Broccoli seeds indoors around Dec 17 (6 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 5–10 days.

Transplant Outdoors: Feb 11

Transplant Broccoli seedlings outdoors after Feb 11. 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 12

First harvest approximately Apr 12 (~60 days from transplant). Continue harvesting until first frost (Dec 22).

Fall Planting: Sep 29

For a fall harvest, plant Broccoli around Sep 29 (12 weeks before first frost).

Companion Planting

✅ Sage ✅ Rosemary ✅ Mint ✅ Chamomile ✅ Dill

❌ Strawberries❌ Tomatoes❌ Beans

Broccoli 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 Broccoli Garden

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

Start Free Broccoli Growing Guide