When to Plant Broccoli in Allerton, Iowa (50008)

Location

Allerton, Iowa

ZIP Code

50008

USDA Zone

Last Frost

Saturday, April 25, 2026

📅 Planting Calendar

Start Seeds Indoors Saturday, March 14, 2026

Transplant Outdoors Saturday, April 25, 2026

Pro Tip: Start Broccoli seeds indoors 6 weeks before your last frost date, then transplant outdoors around Saturday, April 25, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. italica

Days to Maturity 60 days

Mature Height 18-30"

Spread 18"

Type Head

Fruit Size Medium (4-7 inch head)

☀️ Growing Requirements

☀️

Sun

Full Sun (6 hours)

💧

Water

Regular (1-1.5 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Broccoli in Allerton?

Get your seeds now so they're ready by Saturday, March 14, 2026.

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🤝 Good Companions

BeetCeleryOnionPotatoDill

⚠️ Avoid Planting Near

TomatoStrawberryPepper

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Growing Broccoli in Zone 5b

Broccoli (Brassica oleracea var. italica) is a popular garden vegetable. In Allerton, Iowa, which is in USDA Hardiness Zone 5b, you should start seeds indoors around Saturday, March 14, 2026.

Your average last frost date is Saturday, April 25, 2026. Plan to transplant your Broccoli seedlings outdoors around Saturday, April 25, 2026, about 0 weeks after your last frost date.