Growing Brussels Sprouts in Zone 10a

Zone 10a has a year-round growing season. Brussels Sprouts 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 Harvest100

SunFull Sun

Frost ToleranceModerate

Spacing24/sqft

When to Plant Brussels Sprouts in Zone 10a

Start Seeds Indoors: Jan 9

Start Brussels Sprouts seeds indoors around Jan 9 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.

Transplant Outdoors: Feb 6

Transplant Brussels Sprouts seedlings outdoors after Feb 6. Wait until soil temperature reaches 50°F. Space plants at 24/sqft. Harden off plants for a week before moving outside.

Harvest: May 7

First harvest approximately May 7 (~90 days from transplant). Continue harvesting until first frost (Dec 1).

Fall Planting: Aug 11

For a fall harvest, plant Brussels Sprouts around Aug 11 (16 weeks before first frost).

Companion Planting

✅ Thyme✅ Nasturtiums✅ Onions✅ Garlic

❌ Beans❌ Strawberries

Brussels Sprouts 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 Brussels Sprouts in Zone 10a?

Start Brussels Sprouts seeds indoors around Jan 9. Transplant outdoors after Feb 6. Expect first harvest around May 7.

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 Brussels Sprouts in Zone 10a?

Yes. Brussels Sprouts needs 100 days to harvest. Zone 10a has a 284-day growing season, which is sufficient.

What is the best month to plant Brussels Sprouts in Zone 10a?

The best time to start Brussels Sprouts in Zone 10a is Jan. Begin seeds indoors around Jan 9, then transplant outdoors after the last frost date of Feb 20.

What companion plants grow well with Brussels Sprouts?

Good companion plants for Brussels Sprouts include Thyme, Nasturtiums, Onions, Garlic. Avoid planting Brussels Sprouts near Beans, Strawberries.

How long does Brussels Sprouts take to harvest?

Brussels Sprouts takes approximately 100 days from planting to harvest. In Zone 10a, expect your first harvest around May 7.

Plan Your Brussels Sprouts Garden

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

Start Free Brussels Sprouts Growing Guide