Growing Bok Choy in Zone 3b

Zone 3b has harsh winters and a short growing season. Start Bok Choy early indoors to maximize your harvest window. Last frost: May 15. First frost: Sep 22.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 3Sep 22

Season: May 15 – Sep 22 (130 days) · Succession: plant every 2 weeks (up to 6x)

Zone3b

Last FrostMay 15

First FrostSep 22

Season Length130 days

Days to Harvest45

SunPart Sun / Part Shade

Frost ToleranceModerate

Spacing4/sqft (6" apart)

When to Plant Bok Choy in Zone 3b

Start Seeds Indoors: Apr 3

Start Bok Choy seeds indoors around Apr 3 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 4–8 days.

Transplant Outdoors: May 8

Transplant Bok Choy seedlings outdoors after May 8. Wait until soil temperature reaches 45°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Jun 12

First harvest approximately Jun 12 (~35 days from transplant). Continue harvesting until first frost (Sep 22).

Fall Planting: Aug 4

For a fall harvest, plant Bok Choy around Aug 4 (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 3b?

Start Bok Choy seeds indoors around Apr 3. Transplant outdoors after May 8. Expect first harvest around Jun 12.

What is the last frost date for Zone 3b?

The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.

Can I grow Bok Choy in Zone 3b?

Yes. Bok Choy needs 45 days to harvest. Zone 3b has a 130-day growing season, which is sufficient. You can plant up to 6 successions.

What is the best month to plant Bok Choy in Zone 3b?

The best time to start Bok Choy in Zone 3b is Apr. Begin seeds indoors around Apr 3, then transplant outdoors after the last frost date of May 15.

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 3b, expect your first harvest around Jun 12.

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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