When to Plant Onion in Anderson, South Carolina (29621)

Location

Anderson, South Carolina

ZIP Code

29621

USDA Zone

Last Frost

Friday, March 20, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, January 23, 2026

Transplant Outdoors Friday, April 3, 2026

Pro Tip: Start Onion seeds indoors 8 weeks before your last frost date, then transplant outdoors around Friday, April 3, 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 Anderson?

Get your seeds now so they're ready by Friday, January 23, 2026.

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🤝 Good Companions

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⚠️ Avoid Planting Near

BeanPeaAsparagus

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Growing Onion in Zone 8a

Onion (Allium cepa) is a popular garden vegetable. In Anderson, South Carolina, which is in USDA Hardiness Zone 8a, you should start seeds indoors around Friday, January 23, 2026.

Your average last frost date is Friday, March 20, 2026. Plan to transplant your Onion seedlings outdoors around Friday, April 3, 2026, about 2 weeks after your last frost date.