When to Plant Echinacea (Coneflower) in Lake Oswego, Oregon (97035)

Location

Lake Oswego, Oregon

ZIP Code

97035

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, December 12, 2025

Transplant Outdoors Friday, March 6, 2026

Pro Tip: Start Echinacea (Coneflower) seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, March 6, 2026.

🌿 Plant Details

Scientific Name Echinacea purpurea

Days to Maturity 365 days

Mature Height 24-48"

Spread 24"

Type Perennial

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Low (drought tolerant once established)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Echinacea (Coneflower) in Lake Oswego?

Get your seeds now so they're ready by Friday, December 12, 2025.

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Other Plants for Lake Oswego

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Growing Echinacea (Coneflower) in Zone 9a

Echinacea (Coneflower) (Echinacea purpurea) is a popular garden vegetable. In Lake Oswego, Oregon, which is in USDA Hardiness Zone 9a, you should start seeds indoors around Friday, December 12, 2025.

Your average last frost date is Friday, February 20, 2026. Plan to transplant your Echinacea (Coneflower) seedlings outdoors around Friday, March 6, 2026, about 2 weeks after your last frost date.