Growing Napa Cabbage in Zone 9a

Zone 9a has warm winters and an extended growing season — excellent for heat-loving crops like Napa Cabbage. 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 Harvest70

SunFull Sun

Frost ToleranceModerate

Spacing12/sqft

When to Plant Napa Cabbage in Zone 9a

Start Seeds Indoors: Feb 6

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

Transplant Outdoors: Feb 27

Transplant Napa Cabbage seedlings outdoors after Feb 27. Wait until soil temperature reaches 45°F. Space plants at 12/sqft. Harden off plants for a week before moving outside.

Harvest: May 3

First harvest approximately May 3 (~65 days from transplant). Continue harvesting until first frost (Nov 12).

Fall Planting: Aug 20

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

Napa Cabbage 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 Napa Cabbage in Zone 9a?

Start Napa Cabbage seeds indoors around Feb 6. Transplant outdoors after Feb 27. Expect first harvest around May 3.

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 Napa Cabbage in Zone 9a?

Yes. Napa Cabbage needs 70 days to harvest. Zone 9a has a 237-day growing season, which is sufficient.

What is the best month to plant Napa Cabbage in Zone 9a?

The best time to start Napa Cabbage in Zone 9a is Feb. Begin seeds indoors around Feb 6, then transplant outdoors after the last frost date of Mar 20.

How long does Napa Cabbage take to harvest?

Napa Cabbage takes approximately 70 days from planting to harvest. In Zone 9a, expect your first harvest around May 3.

Plan Your Napa Cabbage Garden

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

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