Growing Bok Choy in Zone 3a

Zone 3a has harsh winters and a short growing season. Start Bok Choy early indoors to maximize your harvest window. Last frost: May 22. First frost: Sep 12.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 10Sep 12

Season: May 22 – Sep 12 (113 days) · Succession: plant every 2 weeks (up to 4x)

Zone3a

Last FrostMay 22

First FrostSep 12

Season Length113 days

Days to Harvest45

SunPart Sun / Part Shade

Frost ToleranceModerate

Spacing4/sqft (6" apart)

When to Plant Bok Choy in Zone 3a

Start Seeds Indoors: Apr 10

Start Bok Choy seeds indoors around Apr 10 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 4–8 days.

Transplant Outdoors: May 15

Transplant Bok Choy seedlings outdoors after May 15. 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 19

First harvest approximately Jun 19 (~35 days from transplant). Continue harvesting until first frost (Sep 12).

Fall Planting: Jul 25

For a fall harvest, plant Bok Choy around Jul 25 (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 3a?

Start Bok Choy seeds indoors around Apr 10. Transplant outdoors after May 15. Expect first harvest around Jun 19.

What is the last frost date for Zone 3a?

The average last spring frost date for Zone 3a is May 22. The first fall frost averages Sep 12, giving a 113-day growing season.

Can I grow Bok Choy in Zone 3a?

Yes. Bok Choy needs 45 days to harvest. Zone 3a has a 113-day growing season, which is sufficient. You can plant up to 4 successions.

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

The best time to start Bok Choy in Zone 3a is Apr. Begin seeds indoors around Apr 10, then transplant outdoors after the last frost date of May 22.

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 3a, expect your first harvest around Jun 19.

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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