When to Plant Cabbage in Onslow, Iowa (52321)

Location

Onslow, Iowa

ZIP Code

52321

USDA Zone

Last Frost

Sunday, May 10, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, March 29, 2026

Transplant Outdoors Sunday, May 10, 2026

Pro Tip: Start Cabbage seeds indoors 6 weeks before your last frost date, then transplant outdoors around Sunday, May 10, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. capitata

Days to Maturity 70 days

Mature Height 12-18"

Spread 24"

Type Head

Fruit Size Large (2-5 lb head)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (1-1.5 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-10 days

Ready to Plant Cabbage in Onslow?

Get your seeds now so they're ready by Sunday, March 29, 2026.

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🤝 Good Companions

CeleryDillOnionPotatoChamomile

⚠️ Avoid Planting Near

StrawberryTomatoGrape

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Growing Cabbage in Zone 5a

Cabbage (Brassica oleracea var. capitata) is a popular garden vegetable. In Onslow, Iowa, which is in USDA Hardiness Zone 5a, you should start seeds indoors around Sunday, March 29, 2026.

Your average last frost date is Sunday, May 10, 2026. Plan to transplant your Cabbage seedlings outdoors around Sunday, May 10, 2026, about 0 weeks after your last frost date.