When to Plant Onion in Fairbanks, Alaska (99708)

Location

Fairbanks, Alaska

ZIP Code

99708

USDA Zone

Last Frost

Monday, June 1, 2026

📅 Planting Calendar

Start Seeds Indoors Monday, April 6, 2026

Transplant Outdoors Monday, June 15, 2026

Pro Tip: Start Onion seeds indoors 8 weeks before your last frost date, then transplant outdoors around Monday, June 15, 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 Fairbanks?

Get your seeds now so they're ready by Monday, April 6, 2026.

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🤝 Good Companions

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⚠️ Avoid Planting Near

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Growing Onion in Zone 2a

Onion (Allium cepa) is a popular garden vegetable. In Fairbanks, Alaska, which is in USDA Hardiness Zone 2a, you should start seeds indoors around Monday, April 6, 2026.

Your average last frost date is Monday, June 1, 2026. Plan to transplant your Onion seedlings outdoors around Monday, June 15, 2026, about 2 weeks after your last frost date.