When to Plant Onion in Avon, Minnesota (56310)

Location

Avon, Minnesota

ZIP Code

56310

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, March 10, 2026

Transplant Outdoors Tuesday, May 19, 2026

Pro Tip: Start Onion seeds indoors 8 weeks before your last frost date, then transplant outdoors around Tuesday, May 19, 2026.

🌿 Plant Details

Scientific Name Allium cepa

Days to Maturity 100 days

Mature Height 12-18"

Spread 4"

Type Bulb

Fruit Size Medium (2-4 inch bulb)

☀️ Growing Requirements

☀️

Sun

Full Sun (6+ hours)

💧

Water

Moderate

↔️

Spacing

4" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 7-10 days

Ready to Plant Onion in Avon?

Get your seeds now so they're ready by Tuesday, March 10, 2026.

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🤝 Good Companions

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⚠️ Avoid Planting Near

BeanPeaAsparagus

Other Plants for Avon

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Growing Onion in Zone 4b

Onion (Allium cepa) is a popular garden vegetable. In Avon, Minnesota, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, March 10, 2026.

Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Onion seedlings outdoors around Tuesday, May 19, 2026, about 2 weeks after your last frost date.