When should I plant Broccoli in Zone 10a?

Start Broccoli seeds indoors around Jan 9. Transplant outdoors after Mar 6. Expect first harvest around May 5.

What is the last frost date for Zone 10a?

The average last spring frost date for Zone 10a is Feb 20. The first fall frost averages Dec 1, giving a 284-day growing season.

Can I grow Broccoli in Zone 10a?

Yes. Broccoli needs 70 days to harvest. Zone 10a has a 284-day growing season, which is sufficient.

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🥦 Growing Broccoli in Zone 10a

Zone 10a has a year-round growing season. Broccoli can be planted almost any time with proper planning. Last frost: Feb 20. First frost: Dec 1.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 9Dec 1

Season: Feb 20 – Dec 1 (284 days)

Zone10a

Last FrostFeb 20

First FrostDec 1

Season Length284 days

Days to Harvest70

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Broccoli in Zone 10a

Start Seeds Indoors: Jan 9

Start Broccoli seeds indoors around Jan 9 (6 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 5–10 days.

Transplant Outdoors: Mar 6

Transplant Broccoli 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 (Dec 1).

Fall Planting: Sep 8

For a fall harvest, plant Broccoli around Sep 8 (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