When should I plant Bok Choy in Zone 4a?

Start Bok Choy seeds indoors around Apr 7. Transplant outdoors after Apr 21. Expect first harvest around May 26.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is May 5. The first fall frost averages Oct 1, giving a 149-day growing season.

Can I grow Bok Choy in Zone 4a?

Yes. Bok Choy needs 45 days to harvest. Zone 4a has a 149-day growing season, which is sufficient. You can plant up to 7 successions.

Growing Bok Choy in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Bok Choy in this zone. Viimeinen halla: May 5. Ensimmäinen halla: Oct 1.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 7Oct 1

Season: May 5 – Oct 1 (149 päivää) · Succession: plant every 2 weeks (up to 7x)

Vyöhyke4a

Viimeinen hallaMay 5

Ensimmäinen hallaOct 1

Kausi149 päivää

Sato45 päivää

AurinkoPuolivarjo

When to Plant Bok Choy in Zone 4a

Start Seeds Indoors: Apr 7

Start Bok Choy seeds indoors around Apr 7 (4 viikkoa ennen viimeistä hallaa). Optimal germination temperature: 65F. Germinates in 4-8 days.

Transplant Outdoors: Apr 21

Transplant Bok Choy seedlings outdoors after Apr 21. Wait until soil temperature reaches 45F. Space plants at 4/m² (15cm välein). Harden off plants for a week before moving outside.

Harvest: May 26

First harvest approximately May 26 (~35 päivää from transplant). Continue harvesting until first frost (Oct 1).

Fall Planting: Aug 13

For a fall harvest, plant Bok Choy around Aug 13 (7 weeks before first frost).

Kumppaniviljely

✅ Porkkanat✅ Punajuuret✅ Tilli✅ Sipulit✅ Pavut

❌ Mansikat

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

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

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