When to Plant Onion in Cold Spring Harbor, New York (11724)

Location

Cold Spring Harbor, New York

ZIP Code

11724

USDA Zone

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 Cold Spring Harbor?

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

BeanPeaAsparagus

Other Plants for Cold Spring Harbor

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Growing Onion in Zone 7b

Onion (Allium cepa) is a popular garden vegetable. In Cold Spring Harbor, 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.