When to Plant Fennel in Saint Helens, Oregon (97051)

Location

Saint Helens, Oregon

ZIP Code

97051

USDA Zone

Last Frost

Sunday, March 15, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, February 15, 2026

Transplant Outdoors Sunday, March 1, 2026

Pro Tip: Start Fennel seeds indoors 4 weeks before your last frost date, then transplant outdoors around Sunday, March 1, 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 Saint Helens?

Get your seeds now so they're ready by Sunday, February 15, 2026.

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🤝 Good Companions

Dill

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Growing Fennel in Zone 8b

Fennel (Foeniculum vulgare) is a popular garden vegetable. In Saint Helens, Oregon, which is in USDA Hardiness Zone 8b, you should start seeds indoors around Sunday, February 15, 2026.

Your average last frost date is Sunday, March 15, 2026. Plan to transplant your Fennel seedlings outdoors around Sunday, March 1, 2026, about -2 weeks after your last frost date.