When should I plant Bok Choy in Zone 3b?

Start Bok Choy seeds indoors around Apr 17. Transplant outdoors after May 1. Expect first harvest around Jun 5.

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.

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 17Sep 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 17

Start Bok Choy seeds indoors around Apr 17 (4 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 4–8 days.

Transplant Outdoors: May 1

Transplant Bok Choy seedlings outdoors after May 1. 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 5

First harvest approximately Jun 5 (~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

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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