When to Plant Fennel in Suisun City, California (94585)

Location

Suisun City, California

ZIP Code

94585

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, January 13, 2026

Transplant Outdoors Tuesday, January 27, 2026

Pro Tip: Start Fennel seeds indoors 4 weeks before your last frost date, then transplant outdoors around Tuesday, January 27, 2026.

🌿 Plant Details

Scientific Name Foeniculum vulgare

Days to Maturity 80 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 7-14 days

Ready to Plant Fennel in Suisun City?

Get your seeds now so they're ready by Tuesday, January 13, 2026.

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🤝 Good Companions

Dill

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Growing Fennel in Zone 9b

Fennel (Foeniculum vulgare) is a popular garden vegetable. In Suisun City, California, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, January 13, 2026.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Fennel seedlings outdoors around Tuesday, January 27, 2026, about -2 weeks after your last frost date.