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Korean Small Onion illustration

Growing Korean Small Onion in Zone 4b

Zone 4b has cold winters and a moderate growing season. Timing is key for Korean Small Onion in this zone. Last frost: May 1. First frost: Oct 5.

Planting Calendar

Outdoor
Harvest
Apr 3Oct 5

Season: May 1 – Oct 5 (157 days)

Zone4b
Last FrostMay 1
First FrostOct 5
Season Length157 days
Days to Harvest65
SunFull Sun
Frost ToleranceHeavy
Spacing16/sqft (3" apart)

When to Plant Korean Small Onion in Zone 4b

Harvest: May 13

First harvest approximately May 13 (~40 days from transplant). Continue harvesting until first frost (Oct 5). Korean Small Onion can overwinter in mild climates for continued harvest.

Fall Planting: Aug 24

For a fall harvest, plant Korean Small Onion around Aug 24 (6 weeks before first frost).

Companion Planting

✅ Carrot✅ Beet✅ Lettuce
❌ Bean❌ Pea

Korean Small Onion 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 Korean Small Onion Garden

Track Korean Small Onion from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

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