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When to Plant Onion in Water Mill, New York (11976)

Location

Water Mill, New York

ZIP Code

11976

USDA Zone

7b

Last Frost

Sunday, April 5, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, February 8, 2026
Transplant Outdoors Sunday, April 19, 2026

Pro Tip: Start Onion seeds indoors 8 weeks before your last frost date, then transplant outdoors around Sunday, April 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 Water Mill?

Get your seeds now so they're ready by Sunday, February 8, 2026.

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🤝 Good Companions

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⚠️ Avoid Planting Near

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Growing Onion in Zone 7b

Onion (Allium cepa) is a popular garden vegetable. In Water Mill, New York, which is in USDA Hardiness Zone 7b, you should start seeds indoors around Sunday, February 8, 2026.

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