Growing Bok Choy in Zone 9b

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

Planting Calendar

Indoor

Outdoor

Harvest

Jan 27Nov 15

Season: Mar 10 – Nov 15 (250 days) · Succession: plant every 2 weeks (up to 14x)

Zone9b

Last FrostMar 10

First FrostNov 15

Season Length250 days

Days to Harvest45

SunPart Sun / Part Shade

Frost ToleranceModerate

Spacing4/sqft (6" apart)

When to Plant Bok Choy in Zone 9b

Start Seeds Indoors: Jan 27

Start Bok Choy seeds indoors around Jan 27 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 4–8 days.

Transplant Outdoors: Mar 3

Transplant Bok Choy seedlings outdoors after Mar 3. Wait until soil temperature reaches 45°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Apr 7

First harvest approximately Apr 7 (~35 days from transplant). Continue harvesting until first frost (Nov 15).

Fall Planting: Sep 27

For a fall harvest, plant Bok Choy around Sep 27 (7 weeks before first frost).

Companion Planting

✅ Carrots✅ Beets✅ Dill✅ Onions✅ Beans

❌ Strawberries

Bok Choy 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 Bok Choy in Zone 9b?

Start Bok Choy seeds indoors around Jan 27. Transplant outdoors after Mar 3. Expect first harvest around Apr 7.

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 Bok Choy in Zone 9b?

Yes. Bok Choy needs 45 days to harvest. Zone 9b has a 250-day growing season, which is sufficient. You can plant up to 14 successions.

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

The best time to start Bok Choy 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 Bok Choy?

Good companion plants for Bok Choy include Carrots, Beets, Dill, Onions, Beans. Avoid planting Bok Choy near Strawberries.

How long does Bok Choy take to harvest?

Bok Choy takes approximately 45 days from planting to harvest. In Zone 9b, expect your first harvest around Apr 7.

Plan Your Bok Choy Garden

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

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